Source: http://www.google.com/patents/US8083853?dq=7,181,690
Timestamp: 2016-10-28 12:24:18
Document Index: 462155605

Matched Legal Cases: ['Application No. 200510106396', 'Application No. 200410082199', 'Application No. 200510106396', 'Application No. 200710166935', 'Application No. 10', 'Application No. 05000831', 'Application No. 05000831', 'Application No. 05764564', 'Application No. 05000831', 'Application No. 10', 'Application No. 10', 'Application No. 05021902', 'Application No. 2004', 'Application No. 10', 'Application No. 10', 'application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 200410082199', 'Application No. 10', 'Application No. 2005', 'Application No. 10', 'Application No. 10', 'Application No. 200580022984', 'Application No. 05000831', 'Application No. 2007101669357', 'Application No. 200810099760', 'Application No. 05000831', 'Application No. 93136349', 'Application No. 05021902', 'application No. 097121591', 'Application No. 10']

Patent US8083853 - Plasma uniformity control by gas diffuser hole design - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsEmbodiments of a gas diffuser plate for distributing gas in a processing chamber are provided. The gas distribution plate includes a diffuser plate having an upstream side and a downstream side, and a plurality of gas passages passing between the upstream and downstream sides of the diffuser plate. The...http://www.google.com/patents/US8083853?utm_source=gb-gplus-sharePatent US8083853 - Plasma uniformity control by gas diffuser hole designAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS8083853 B2Publication typeGrantApplication numberUS 10/889,683Publication dateDec 27, 2011Filing dateJul 12, 2004Priority dateMay 12, 2004Fee statusPaidAlso published asEP1595974A2, EP1595974A3, EP2261393A2, EP2261393A3, US9200368, US20050251990, US20060236934, US20110290183, US20160056019Publication number10889683, 889683, US 8083853 B2, US 8083853B2, US-B2-8083853, US8083853 B2, US8083853B2InventorsSoo Young Choi, John M. White, Qunhua Wang, Li Hou, Ki Woon Kim, Shinichi Kurita, Tae Kyung Won, Suhail Anwar, Beom Soo Park, Robin L. TinerOriginal AssigneeApplied Materials, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (194), Non-Patent Citations (58), Referenced by (91), Classifications (38), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetPlasma uniformity control by gas diffuser hole design
US 8083853 B2Abstract
Embodiments of a gas diffuser plate for distributing gas in a processing chamber are provided. The gas distribution plate includes a diffuser plate having an upstream side and a downstream side, and a plurality of gas passages passing between the upstream and downstream sides of the diffuser plate. The gas passages include hollow cathode cavities at the downstream side to enhance plasma ionization. The depths, the diameters, the surface area and density of hollow cathode cavities of the gas passages that extend to the downstream end can be gradually increased from the center to the edge of the diffuser plate to improve the film thickness and property uniformity across the substrate. The increasing diameters, depths and surface areas from the center to the edge of the diffuser plate can be created by bending the diffuser plate toward downstream side, followed by machining out the convex downstream side. Bending the diffuser plate can be accomplished by a thermal process or a vacuum process. The increasing diameters, depths and surface areas from the center to the edge of the diffuser plate can also be created computer numerically controlled machining. Diffuser plates with gradually increasing diameters, depths and surface areas of the hollow cathode cavities from the center to the edge of the diffuser plate have been shown to produce improved uniformities of film thickness and film properties.
a planar diffuser plate element having an edge, a center, an upstream side and a downstream side, wherein the upstream side and the downstream side are parallel; and
inner and outer gas passages passing between the upstream and downstream sides of the diffuser plate element from the center to the edge of the diffuser plate element, each gas passage having:
an orifice hole having a first diameter; and
a hollow cathode cavity that is downstream of the orifice hole and is at the downstream side, the hollow cathode cavity having a cone or cylinder shape and a second diameter at the downstream side that is greater than the first diameter, the second diameters or the depths or a combination of both of the cones or cylinders increases from the center to the edge of the diffuser plate element, the first diameters are substantially uniform from the center to the edge of the diffuser plate element, and the size of the hollow cathode cavities of the inner gas passages is less than the size of the hollow cathode cavities of the outer gas passages.
2. The gas distribution plate assembly of claim 1, wherein the second diameters are between about 0.1 inch to about 1.0 inch.
3. The gas distribution plate assembly of claim 1, wherein the second diameters are between about 0.1 inch to about 0.5 inch.
4. The gas distribution plate assembly of claim 1, wherein the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch.
5. The gas distribution plate assembly of claim 1, wherein the depths of the cones or cylinders are between about 0.1 inch to about 1.0 inch.
6. The gas distribution plate assembly of claim 1, wherein flaring angles of the cones are between about 10 degrees to about 50 degrees.
7. The gas distribution plate assembly of claim 1, wherein flaring angles of the cones are between about 20 degrees to about 40 degrees.
8. The gas distribution plate assembly of claim 1, wherein the second diameters are between about 0.1 inch to about 1.0 inch, the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch, and flaring angles of the cones are between about 10 degrees to about 50 degrees.
9. The gas distribution plate assembly of claim 1, wherein a spacing between the downstream ends of the hollow cathode cavities of adjacent gas passages is at most about 0.6 inch.
10. The gas distribution plate assembly of claim 1, wherein the thickness of the diffuser plate element is between about 0.8 inch to about 3.0 inch.
11. The gas distribution plate assembly of claim 1, wherein the diffuser plate element is rectangular.
12. The gas distribution plate assembly of claim 11, wherein the diffuser plate element size is at least 1,200,000 mm2.
13. The gas distribution plate assembly of claim 1, each gas passage further comprising:
a first bore extending from the upstream side to the orifice hole, the first bore having a third diameter greater than the first diameter and a tapered, beveled, chamfered, or rounded bottom; and
a tapered, beveled, chamfered, or rounded surface of the hollow cathode cavity coupled to the orifice hole.
14. The assembly of claim 1, wherein the orifice holes are shaped to promote an even flow of gas therethrough.
15. The assembly of claim 1, wherein the orifice holes are configured uniformly among the gas passages.
16. The assembly of claim 1, wherein the orifice holes are configured non-uniformly among the gas passages.
17. A gas distribution plate assembly for a plasma processing chamber, comprising:
a diffuser plate element having an edge, a center, an upstream side and a downstream side; and
an orifice hole having a first diameter, wherein a length of the orifice divided by the first diameter is between 2 and 3.33; and
a hollow cathode cavity that is downstream of the orifice hole and is at the downstream side, the hollow cathode cavity having a cone or cylinder shape and a second diameter at the downstream side that is greater than the first diameter, the second diameters or the depths or a combination of both of the cones or cylinders increases from the center to the edge of the diffuser plate element, the first diameters are substantially uniform from the center to the edge of the diffuser plate element, and the hollow cathode cavity surface area density of the inner gas passages is less than the hollow cathode cavity surface area density of the outer gas passages.
18. The gas distribution plate assembly of claim 17, wherein the second diameters are between about 0.1 inch to about 1.0 inch.
19. The gas distribution plate assembly of claim 17, wherein the second diameters are between about 0.1 inch to about 0.5 inch.
20. The gas distribution plate assembly of claim 17, wherein the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch.
21. The gas distribution plate assembly of claim 17, wherein the depths of the cones or cylinders are between about 0.1 inch to about 1.0 inch.
22. The gas distribution plate assembly of claim 17 wherein flaring angles of the cones are between about 10 degrees to about 50 degrees.
23. The gas distribution plate assembly of claim 17, wherein flaring angles of the cones are between about 20 degrees to about 40 degrees.
24. The gas distribution plate assembly of claim 17, wherein the second diameters are between about 0.1 inch to about 1.0 inch, the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch, and flaring angles of the cones are between about 10 degrees to about 50 degrees.
25. The gas distribution plate assembly of claim 17, wherein a spacing between the downstream ends of the hollow cathode cavities of adjacent gas passages is at most about 0.6 inch.
26. The gas distribution plate assembly of claim 17, wherein the thickness of the diffuser plate element is between about 0.8 inch to about 3.0 inch.
27. The gas distribution plate assembly of claim 17, wherein the diffuser plate element is rectangular.
28. The gas distribution plate assembly of claim 27, wherein the diffuser plate element size is at least 1,200,000 mm2.
29. The gas distribution plate assembly of claim 17, each gas passage further comprising:
30. The assembly of claim 17, wherein the orifice holes are shaped to promote an even flow of gas therethrough.
31. The assembly of claim 17, wherein the orifice holes are configured uniformly among the gas passages.
32. The assembly of claim 17, wherein the orifice holes are configured non-uniformly among the gas passages.
33. A gas distribution plate assembly for a plasma processing chamber, comprising:
a diffuser plate element having an edge, a center, an upstream side and a down stream side; and
a plurality of gas passages passing between the upstream and downstream sides of the diffuser plate element from the center to the edge of the diffuser plate element, each gas passage having:
a hollow cathode cavity that is downstream of the orifice hole and intersects the downstream side of the diffuser plate element, the hollow cathode cavity having a cone or cylinder shape and a second diameter at the downstream side that is greater than the first diameter, the second diameters or the depths or a combination of both of the cones or cylinders increases from the center to the edge of the diffuser plate element, the first diameters are substantially uniform from the center to the edge of the diffuser plate element, the densities of the hollow cathode cavities increase from the center to the edge of the diffuser plate element, and the hollow cathode cavity volume density or the hollow cathode cavity surface area density increases from the center to the edge of the diffuser plate element.
34. The gas distribution plate assembly of claim 33, wherein the densities of the hollow cathode cavities are between about 10% to about 100%.
35. The gas distribution plate assembly of claim 33, wherein the densities of the hollow cathode cavities are between about 30% to about 100%.
36. The gas distribution plate assembly of claim 33, wherein the second diameters are between about 0.1 inch to about 1.0 inch.
37. The gas distribution plate assembly of claim 33, wherein the second diameters are between about 0.1 inch to about 0.5 inch.
38. The gas distribution plate assembly of claim 33, wherein the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch.
39. The gas distribution plate assembly of claim 33, wherein the depths of the cones or cylinders are between about 0.1 inch to about 1.0 inch.
40. The gas distribution plate assembly of claim 33, wherein flaring angles of the cones are between about 10 degrees to about 50 degrees.
41. The gas distribution plate assembly of claim 33, wherein flaring angles of the cones are between about 20 degrees to about 40 degrees.
42. The gas distribution plate assembly of claim 33, wherein the second diameters are between about 0.1 inch to about 1.0 inch, the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch, and flaring angles of the cones are between about 10 degrees to about 50 degrees.
43. The gas distribution plate assembly of claim 33, wherein the thickness of the diffuser plate element is between about 0.8 inch to about 3.0 inch.
44. The gas distribution plate assembly of claim 33, wherein the diffuser plate element is rectangular.
45. The gas distribution plate assembly of claim 44, wherein the diffuser plate element size is at least 1,200,000 mm2.
46. The assembly of claim 33, wherein the orifice holes are shaped to promote an even flow of gas therethrough.
47. The assembly of claim 33, wherein the orifice holes are configured uniformly among the gas passages.
48. The assembly of claim 33, wherein the orifice holes are configured non-uniformly among the gas passages.
49. A plasma processing chamber, comprising:
a planar diffuser plate element having an edge, a center, an upstream side and a downstream side, wherein the upstream side and the downstream side are parallel;
a RF power source coupled to the diffuser plate element;
a hollow cathode cavity that is downstream of the orifice hole and is at the downstream side, the hollow cathode cavity having a cone or cylinder shape and a second diameter at the downstream side that is greater than the first diameter, the second diameters or the depths or a combination of both of the cones or cylinders increases from the center to the edge of the diffuser plate element, the first diameters are substantially uniform from the center to the edge of the diffuser plate element, and the size of the hollow cathode cavities of the inner gas passages is less than the size of the hollow cathode cavities of the outer gas passages; and
a substrate support adjacent the downstream side of the diffuser plate element.
50. The plasma processing chamber of claim 49, wherein the second diameters are between about 0.1 inch to about 1.0 inch.
51. The plasma processing chamber of claim 49, wherein the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch.
52. The plasma processing chamber of claim 49, wherein flaring angles of the cones are between about 10 degrees to about 50 degrees.
53. The plasma processing chamber of claim 49, wherein the second diameters are between about 0.1 inch to about 1.0 inch, the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch, and flaring angles of the cones are between about 10 degrees to about 50 degrees.
54. The plasma processing chamber of claim 49, wherein a spacing between the downstream ends of the hollow cathode cavities of adjacent gas passages is at most about 0.6 inch.
55. The plasma processing chamber of claim 49, wherein the thickness of the diffuser plate element is between about 0.8 inch to about 3.0 inch.
56. The plasma processing chamber of claim 49, wherein the diffuser plate element is rectangular.
57. The plasma processing chamber of claim 56, wherein the diffuser plate element size is at least 1,200,000 mm2.
58. The plasma processing chamber of claim 49, each gas passage further comprising:
59. The chamber of claim 49, wherein the orifice holes are shaped to promote an even flow of gas therethrough.
60. The chamber of claim 49, wherein the orifice holes are configured uniformly among the gas passages.
61. The chamber of claim 49, wherein the orifice holes are configured non-uniformly among the gas passages.
62. A plasma processing chamber, comprising:
a diffuser plate element having an edge, a center, an upstream side and a downstream side;
a hollow cathode cavity that is downstream of the orifice hole and is at the downstream side, the hollow cathode cavity having a cone or cylinder shape and a second diameter at the downstream side that is greater than the first diameter, the second diameters or the depths or a combination of both of the cones or cylinders increases from the center to the edge of the diffuser plate element, the first diameters are substantially uniform from the center to the edge of the diffuser plate element, and the hollow cathode cavity surface area density of the inner gas passages is less than the hollow cathode cavity surface area density of the outer gas passages; and
63. The plasma processing chamber of claim 62, wherein the second diameters are between about 0.1 inch to about 1.0 inch.
64. The plasma processing chamber of claim 62, wherein the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch.
65. The plasma processing chamber of claim 62, wherein flaring angles of the cones are between about 10 degrees to about 50 degrees.
66. The plasma processing chamber of claim 62, wherein the second diameters are between about 0.1 inch to about 1.0 inch, the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch, and flaring angles of the cones are between about 10 degrees to about 50 degrees.
67. The plasma processing chamber of claim 62, wherein a spacing between the downstream ends of the hollow cathode cavities of adjacent gas passages is at most about 0.6 inch.
68. The plasma processing chamber of claim 62, wherein the thickness of the diffuser plate element is between about 0.8 inch to about 3.0 inch.
69. The plasma processing chamber of claim 62, wherein the diffuser plate element is rectangular.
70. The plasma processing chamber of claim 69, wherein the diffuser plate element size is at least 1,200,000 mm2.
71. The plasma processing chamber of claim 62, each gas passage further comprising:
72. The chamber of claim 62, wherein the orifice holes are shaped to promote an even flow of gas therethrough.
73. The chamber of claim 62, wherein the orifice holes are configured uniformly among the gas passages.
74. The chamber of claim 62, wherein the orifice holes are configured non-uniformly among the gas passages.
75. A plasma processing chamber, comprising:
a planar diffuser plate element having an edge, a center, an upstream side and a down stream side, wherein the upstream side and the down stream side are parallel;
a hollow cathode cavity that is downstream of the orifice hole and is at the downstream side, the hollow cathode cavity having a cone or cylinder shape and a second diameter at the downstream side that is greater than the first diameter, the second diameters or the depths or a combination of both of the cones or cylinders increases from the center to the edge of the diffuser plate element, the first diameters are substantially uniform from the center to the edge of the diffuser plate element, and surface area densities of hollow cathode cavities of the plurality of gas passages increase from the center to the edge of the diffuser plate element; and
76. The plasma processing chamber of claim 75, wherein the surface area densities of the hollow cathode cavities of the plurality of gas passages are between about 10% to about 100%.
77. The plasma processing chamber of claim 75, wherein the second diameters are between about 0.1 inch to about 1.0 inch.
78. The plasma processing chamber of claim 75, wherein the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch.
79. The plasma processing chamber of claim 75, wherein flaring angles of the cones are between about 10 degrees to about 50 degrees.
80. The plasma processing chamber of claim 75, wherein the second diameters are between about 0.1 inch to about 1.0 inch, the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch, and flaring angles of the cones are between about 10 degrees to about 50 degrees.
81. The plasma processing chamber of claim 75, wherein the thickness of the diffuser plate element is between about 0.8 inch to about 3.0 inch.
82. The plasma processing chamber of claim 75, wherein the diffuser plate element is rectangular.
83. The plasma processing chamber of claim 82, wherein the diffuser plate element size is at least 1,200,000 mm2.
84. A gas distribution plate assembly for a plasma processing chamber, comprising:
a planar diffuser plate element having an edge, a center, an upstream side and a downstream side and the diffuser plate is divided into a number of concentric zones, wherein the upstream side and the downstream side are parallel; and
a hollow cathode cavity that is downstream of the orifice hole and is at the downstream side, the hollow cathode cavity having a cone or cylinder shape and a second diameter at the downstream side that is greater than the first diameter, the second diameters or the depths or a combination of both of the cones or cylinders increases from the center to the edge of the diffuser plate element, the first diameters are substantially uniform from the center to the edge of the diffuser plate element, the gas passages in each zone are identical and the volume or surface area of hollow cathode cavities of gas passages in each zone gradually increase from the center to the edge of the diffuser plate element.
85. The gas distribution plate assembly of claim 84, wherein the number of concentric zones is at least two.
86. The gas distribution plate assembly of claim 84, wherein the hollow cathode cavities have densities between about 10% to about 100%.
87. The gas distribution plate assembly of claim 84, wherein the densities of the hollow cathode cavities are between about 30% to about 100%.
88. The gas distribution plate assembly of claim 84, wherein the second diameters are between about 0.1 inch to about 1.0 inch.
89. The gas distribution plate assembly of claim 84, wherein the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch.
90. The gas distribution plate assembly of claim 84, wherein flaring angles of the cones are between about 10 degrees to about 50 degrees.
91. The gas distribution plate assembly of claim 84, wherein the second diameters are between about 0.1 inch to about 1.0 inch, the depths of the cones or cylinders are between about 0.1 inch to about 2.0 inch, and flaring angles of the cones are between about 10 degrees to about 50 degrees.
92. The gas distribution plate assembly of claim 84, wherein a spacing between the downstream ends of the hollow cathode cavities of adjacent gas passages is at most about 0.6 inch.
93. The gas distribution plate assembly of claim 84, wherein the thickness of the diffuser plate element is between about 0.8 inch to about 3.0 inch.
94. The gas distribution plate assembly of claim 84, wherein the diffuser plate element is rectangular.
95. The gas distribution plate assembly of claim 94, wherein the diffuser plate element size is at least 1,200,000 mm2.
96. The assembly of claim 84, wherein the orifice holes are shaped to promote an even flow of gas therethrough.
97. The assembly of claim 84, wherein the orifice holes are configured uniformly among the gas passages.
98. The assembly of claim 84, wherein the orifice holes are configured non-uniformly among the gas passages.
99. The chamber of claim 75, wherein the orifice holes are shaped to promote an even flow of gas therethrough.
100. The chamber of claim 75, wherein the orifice holes are configured uniformly among the gas passages.
101. The chamber of claim 75, wherein the orifice holes are configured non-uniformly among the gas passages.
102. A diffuser plate, comprising:
a body having an edge, a center, a top surface and a bottom surface, wherein the bottom surface is concave;
a plurality of gas passages between the top surface and the bottom surface, from the center to the edge of the body wherein each gas passage has:
a hollow cathode cavity that is downstream of the orifice hole and intersects the bottom surface, the hollow cathode cavity having a cone or cylinder shape and a second diameter at the downstream side that is greater than the first diameter, the second diameters or the depths or a combination of both of the cones or cylinders increases from the center to the edge of the diffuser plate, the first diameters are substantially uniform from the center to the edge of the diffuser plate, and the size of the hollow cathode cavities increases from the center to the edge of the diffuser plate; and
an outer region and an inner region wherein the body between the top and the bottom of the outer region is thicker than the body between the top and the bottom of the inner region.
103. The diffuser plate of claim 102, wherein the top surface is substantially flat.
104. The plate of claim 102, wherein the orifice holes are shaped to promote an even flow of gas therethrough.
105. The plate of claim 102, wherein the orifice holes are configured uniformly among the gas passages.
106. The plate of claim 102, wherein the orifice holes are configured non-uniformly among the gas passages. Description
This application claims benefit of U.S. provisional patent application Ser. No. 60/570,876, filed May 12, 2004, which is herein incorporated by reference.
Therefore, there is a need for an improved gas distribution plate assembly that improves the uniformities of film deposition thickness and film properties.
Embodiments of a gas distribution plate for distributing gas in a processing chamber are provided. In one embodiment, a gas distribution plate assembly for a plasma processing chamber comprises a diffuser plate having an upstream side and a downstream side, and inner and outer gas passages passing between the upstream and downstream sides of the diffuser plate and comprising hollow cathode cavities at the downstream side, wherein the hollow cathode cavity volume density of the inner gas passages are less than the hollow cathode cavity volume density of the outer gas passages.
In another embodiment, a gas distribution plate assembly for a plasma processing chamber comprises a diffuser plate having an upstream side and a downstream side, and inner and outer gas passages passing between the upstream and downstream sides of the diffuser plate and comprising hollow cathode cavities at the downstream side, wherein the hollow cathode cavity surface area density of the inner gas passages are less than the hollow cathode cavity surface area density of the outer gas passages.
In another embodiment, a gas distribution plate assembly for a plasma processing chamber comprises a diffuser plate having an upstream side and a down stream side, and a plurality of gas passages passing between the upstream and downstream sides of the diffuser plate, wherein the densities of hollow cathode cavities gradually increase from the center to the edge of the diffuser plate.
In another embodiment, a plasma processing chamber comprises a diffuser plate having an upstream side and a downstream side, inner and outer gas passages passing between the upstream and downstream sides of the diffuser plate and comprising hollow cathode cavities at the downstream side, wherein the hollow cathode cavity volume density of the inner gas passages are less than the hollow cathode cavity volume density of the outer gas passages, and a substrate support adjacent the downstream side of the diffuser plate.
In another embodiment, a plasma processing chamber comprises a diffuser plate having an upstream side and a downstream side, inner and outer gas passages passing between the upstream and downstream sides of the diffuser plate and comprising hollow cathode cavities at the downstream side, wherein the hollow cathode cavity surface area density of the inner gas passages are less than the hollow cathode cavity surface area density of the outer gas passages, and a substrate support adjacent the downstream side of the diffuser plate.
In another embodiment, a plasma processing chamber comprises a diffuser plate having an upstream side and a down stream side, a plurality of gas passages passing between the upstream and downstream sides of the diffuser plate, wherein the densities of hollow cathode cavities gradually increase from the center to the edge of the diffuser plate, and a substrate support adjacent the downstream side of the diffuser plate.
In another embodiment, a gas distribution plate assembly for a plasma processing chamber comprises a diffuser plate having an upstream side and a down stream side and the gas diffuser plate are divided into a number of concentric zones, and a plurality of gas passages passing between the upstream and downstream sides of the diffuser plate, wherein the gas passages in each zones are identical and the density, the volume, or surface area of hollow cathode cavities of gas passages in each zone gradually increase from the center to the edge of the diffuser plate.
In another embodiment, a method of making a gas diffuser plate for a plasma processing chamber, comprises making a gas diffuser plate to have an upstream side and a down stream side, and a plurality of gas passages passing between the upstream and downstream sides of the diffuser plate, bending the diffuser plate to make it convex smoothly toward downstream side, and machining out the convex surface to flatten the downstream side surface.
In another embodiment, a method of making a gas diffuser plate for a plasma processing chamber comprises machining a gas diffuser plate to have an upstream side and a down stream side, and a plurality of gas passages passing between the upstream and downstream sides of the diffuser plate, wherein densities, volumes or surface area of hollow cathode cavities of the diffuser plate gradually increase from the center to the edge of the diffuser plate.
In another embodiment, a method of depositing a thin film on a substrate comprises placing a substrate in a process chamber with a gas diffuser plate having an upstream side and inner and outer gas passages passing between the upstream and downstream sides of the diffuser plate and comprising hollow cathode cavities at the downstream side, wherein either the hollow cathode cavity volume density, or the hollow cathode cavity surface area density, or the hollow cathode cavity density of the inner gas passages are less than the same parameter of the outer gas passages, flowing process gas(es) through a diffuser plate toward a substrate supported on a substrate support, creating a plasma between the diffuser plate and the substrate support, and depositing a thin film on the substrate in the process chamber.
In another embodiment, a method of making a gas diffuser plate for a plasma processing chamber comprises making a gas diffuser plate to have an upstream side and a down stream side, and a plurality of gas passages passing between the upstream and downstream sides of the diffuser plate, and machining the downstream surface to make the downstream surface concave.
In yet another embodiment, a method of making a gas diffuser plate for a plasma processing chamber comprises bending a diffuser plate that have an upstream side and a down stream side to make the downstream surface concave and the upstream surface convex, making a plurality of gas passages passing between the upstream and downstream sides of the diffuser plate by making hollow cathode cavities to the same depth from a fictitious flat downstream surface, and making all gas passages to have the same-size orifice holes which are connected to the hollow cathode cavities.
FIG. 2 is a schematic cross-sectional view of an illustrative processing chamber having one embodiment of a gas distribution plate assembly of the present invention.
FIG. 3 depicts a cross-sectional schematic view of a gas diffuser plate.
FIG. 4A shows the process flow of depositing a thin film on a substrate in a process chamber with a diffuser plate.
FIG. 4B shows the deposition rate measurement across a 1500 mm by 1800 mm substrate collected from deposition with a diffuser plate with uniform diffuser holes diameters and depths.
FIG. 5 shows 2 sides (501 and 502) of the substrate that are close to the sides with pumping channels closed and the 5 measurement locations on a substrate.
FIG. 6A (Prior Art) illustrates the concept of hollow cathode effect.
FIGS. 6B-6G illustrates various designs of hollow cathode cavities.
FIG. 7A shows the definition of diameter “D”, the depth “d” and the flaring angle “α” of the bore that extends to the downstream end of a gas passage.
FIG. 7B shows the dimensions of a gas passage.
FIG. 7C shows the dimensions of a gas passage.
FIG. 7D shows the dimensions of a gas passage.
FIG. 7E shows the distribution of gas passages across a diffuser plate.
FIG. 8 shows the deposition rate measurement across a 1500 mm by 1800 mm substrate collected from deposition with a diffuser plate with a distribution of gas passages across the diffuser plate as shown in FIG. 7E.
FIG. 9A shows the process flow of making a diffuser plate.
FIG. 9B shows a bent diffuser plate.
FIG. 9C shows a diffuser plate that was previously bent and the side that facing the downstream side was machined to be flat.
FIG. 9D shows the distribution of depths of diffuser bores that extends to the downstream ends of gas passages of a diffuser plate used to process 1500 mm by 1850 mm substrates.
FIG. 9E shows the measurement of deposition rates across a 1500 mm by 1850 mm substrate.
FIG. 9F shows the distribution of depths of diffuser bores that extends to the downstream ends of gas passages of a diffuser plate used to process 1870 mm by 2200 mm substrates.
FIG. 9G shows the measurement of deposition rates across an 1870 mm by 2200 mm substrate.
FIG. 10A shows the process flow of bending the diffuser plate by a thermal process.
FIG. 10B shows the diffuser plate on the supports in the thermal environment that could be used to bend the diffuser plate.
FIG. 10C shows the convex diffuser plate on the supports in the thermal environment.
FIG. 11A shows the process flow of bending the diffuser plate by a vacuum process.
FIG. 11B shows the diffuser plate on the vacuum assembly.
FIG. 11C shows the convex diffuser plate on the vacuum assembly.
FIG. 12A shows the process flow of creating a diffuser plate with varying diameters and depths of bores that extends to the downstream side of the diffuser plate.
FIG. 12B shows the cross section of a diffuser plate with varying diameters and depths of bores that extends to the downstream side of the diffuser plate.
FIG. 12C shows a diffuser plate with substantially identical diffuser holes from center to edge of the diffuser plate.
FIG. 12D shows the diffuser plate of FIG. 12C after the bottom surface has been machined into a concave shape.
FIG. 12E shows the diffuser plate of FIG. 12D after its bottom surface has been pulled substantially flat.
FIG. 12F shows a diffuser plate, without any diffuser holes, that has been bent into a concave (bottom surface) shape.
FIG. 12G shows the diffuser plate of FIG. 12F with diffuser holes.
FIG. 12H shows the diffuser plate of FIG. 12G after its bottom surface has been pulled substantially flat.
FIG. 12I shows a diffuser plate with diffuser holes in multiple zones.
FIG. 12J shows a diffuser plate with mixed hollow cathode cavity diameters and the inner region hollow cathode cavity volume and/or surface area density is higher than the outer region hollow cathode cavity volume and/or surface area density.
FIG. 12K shows a diffuser plate with most of the hollow cathode cavities the same, while there are a few larger hollow cathode cavities near the edge of the diffuser plate.
FIG. 13 shows the downstream side view of a diffuser plate with varying diffuser hole densities.
FIG. 1 illustrates cross-sectional schematic views of a thin film transistor structure. A common TFT structure is the back channel etch (BCE) inverted staggered (or bottom gate) TFT structure shown in FIG. 1. The BCE process is preferred, because the gate dielectric (SiN), and the intrinsic as well as n+ doped amorphous silicon films can be deposited in the same PECVD pump-down run. The BCE process shown here involves only 5 patterning masks. The substrate 101 may comprise a material that is essentially optically transparent in the visible spectrum, such as, for example, glass or clear plastic. The substrate may be of varying shapes or dimensions. Typically, for TFT applications, the substrate is a glass substrate with a surface area greater than about 500 mm2. A gate electrode layer 102 is formed on the substrate 101. The gate electrode layer 102 comprises an electrically conductive layer that controls the movement of charge carriers within the TFT. The gate electrode layer 102 may comprise a metal such as, for example, aluminum (Al), tungsten (W), chromium (Cr), tantalum (Ta), or combinations thereof, among others. The gate electrode layer 102 may be formed using conventional deposition, lithography and etching techniques. Between the substrate 101 and the gate electrode layer 102, there may be an optional insulating material, for example, such as silicon dioxide (SiO2) or silicon nitride (SiN), which may also be formed using an embodiment of a PECVD system described in this invention. The gate electrode layer 102 is then lithographically patterned and etched using conventional techniques to define the gate electrode.
A gate dielectric layer 103 is formed on the gate electrode layer 102. The gate dielectric layer 103 may be silicon dioxide (SiO2), silicon oxynitride (SiON), or silicon nitride (SiN), deposited using an embodiment of a PECVD system described in this invention. The gate dielectric layer 103 may be formed to a thickness in the range of about 100 Å to about 6000 Å.
A bulk semiconductor layer 104 is formed on the gate dielectric layer 103. The bulk semiconductor layer 104 may comprise polycrystalline silicon (polysilicon) or amorphous silicon (α-Si), which could be deposited using an embodiment of a PECVD system described in this invention or other conventional methods known to the art. Bulk semiconductor layer 104 may be deposited to a thickness in the range of about 100 Å to about 3000 Å. A doped semiconductor layer 105 is formed on top of the semiconductor layer 104. The doped semiconductor layer 105 may comprise n-type (n+) or p-type (p+) doped polycrystalline (polysilicon) or amorphous silicon (α-Si), which could be deposited using an embodiment of a PECVD system described in this invention or other conventional methods known to the art. Doped semiconductor layer 105 may be deposited to a thickness within a range of about 100 Å to about 3000 Å. An example of the doped semiconductor layer 105 is n+ doped α-Si film. The bulk semiconductor layer 104 and the doped semiconductor layer 105 are lithographically patterned and etched using conventional techniques to define a mesa of these two films over the gate dielectric insulator, which also serves as storage capacitor dielectric. The doped semiconductor layer 105 directly contacts portions of the bulk semiconductor layer 104, forming a semiconductor junction.
A conductive layer 106 is then deposited on the exposed surface. The conductive layer 106 may comprise a metal such as, for example, aluminum (Al), tungsten (W), molybdenum (Mo), chromium (Cr), tantalum (Ta), and combinations thereof, among others. The conductive layer 106 may be formed using conventional deposition techniques. Both the conductive layer 106 and the doped semiconductor layer 105 may be lithographically patterned to define source and drain contacts of the TFT. Afterwards, a passivation layer 107 may be deposited. Passivation layer 107 conformably coats exposed surfaces. The passivation layer 107 is generally an insulator and may comprise, for example, silicon dioxide (SiO2) or silicon nitride (SiN). The passivation layer 107 may be formed using, for example, PECVD or other conventional methods known to the art. The passivation layer 107 may be deposited to a thickness in the range of about 1000 Å to about 5000 Å. The passivation layer 107 is then lithographically patterned and etched using conventional techniques to open contact holes in the passivation layer.
The doped or un-doped (intrinsic) amorphous silicon (α-Si), silicon dioxide (SiO2), silicon oxynitride (SiON) and silicon nitride (SiN) films used in liquid crystal displays (or flat panels) could all be deposited using an embodiment of a plasma enhanced chemical vapor deposition (PECVD) system described in this invention. The TFT structure described here is merely used as an example. The current invention applies to manufacturing any devices that are applicable.
FIG. 2 is a schematic cross-sectional view of one embodiment of a plasma enhanced chemical vapor deposition system 200, available from AKT, a division of Applied Materials, Inc., Santa Clara, Calif. The system 200 generally includes a processing chamber 202 coupled to a gas source 204. The processing chamber 202 has walls 206 and a bottom 208 that partially define a process volume 212. The process volume 212 is typically accessed through a port (not shown) in the walls 206 that facilitate movement of a substrate 240 into and out of the processing chamber 202. The walls 206 and bottom 208 are typically fabricated from a unitary block of aluminum or other material compatible with processing. The walls 206 support a lid assembly 210 that contains a pumping plenum 214 that couples the process volume 212 to an exhaust port (that includes various pumping components, not shown).
A temperature controlled substrate support assembly 238 is centrally disposed within the processing chamber 202. The support assembly 238 supports a glass substrate 240 during processing. In one embodiment, the substrate support assembly 238 comprises an aluminum body 224 that encapsulates at least one embedded heater 232. The heater 232, such as a resistive element, disposed in the support assembly 238, is coupled to an optional power source 274 and controllably heats the support assembly 238 and the glass substrate 240 positioned thereon to a predetermined temperature. Typically, in a CVD process, the heater 232 maintains the glass substrate 240 at a uniform temperature between about 150 to at least about 460 degrees Celsius, depending on the deposition processing parameters for the material being deposited.
The support assembly 238 generally is grounded such that RF power supplied by a power source 222 to a gas distribution plate assembly 218 positioned between the lid assembly 210 and substrate support assembly 238 (or other electrode positioned within or near the lid assembly of the chamber) may excite gases present in the process volume 212 between the support assembly 238 and the distribution plate assembly 218. The RF power from the power source 222 is generally selected commensurate with the size of the substrate to drive the chemical vapor deposition process.
The support assembly 238 additionally supports a circumscribing shadow frame 248. Generally, the shadow frame 248 prevents deposition at the edge of the glass substrate 240 and support assembly 238 so that the substrate does not stick to the support assembly 238. The support assembly 238 has a plurality of holes 228 disposed therethrough that accept a plurality of lift pins 250. The lift pins 250 are typically comprised of ceramic or anodized aluminum. The lift pins 250 may be actuated relative to the support assembly 238 by an optional lift plate 254 to project from the support surface 230, thereby placing the substrate in a spaced-apart relation to the support assembly 238.
The lid assembly 210 provides an upper boundary to the process volume 212. The lid assembly 210 typically can be removed or opened to service the processing chamber 202. In one embodiment, the lid assembly 210 is fabricated from aluminum (Al). The lid assembly 210 includes a pumping plenum 214 formed therein coupled to an external pumping system (not shown). The pumping plenum 214 is utilized to channel gases and processing by-products uniformly from the process volume 212 and out of the processing chamber 202.
The lid assembly 210 typically includes an entry port 280 through which process gases provided by the gas source 204 are introduced into the processing chamber 202. The entry port 280 is also coupled to a cleaning source 282. The cleaning source 282 typically provides a cleaning agent, such as dissociated fluorine, that is introduced into the processing chamber 202 to remove deposition by-products and films from processing chamber hardware, including the gas distribution plate assembly 218.
The gas distribution plate assembly 218 is coupled to an interior side 220 of the lid assembly 210. The gas distribution plate assembly 218 is typically configured to substantially follow the profile of the glass substrate 240, for example, polygonal for large area flat panel substrates and circular for wafers. The gas distribution plate assembly 218 includes a perforated area 216 through which process and other gases supplied from the gas source 204 are delivered to the process volume 212. The perforated area 216 of the gas distribution plate assembly 218 is configured to provide uniform distribution of gases passing through the gas distribution plate assembly 218 into the processing chamber 202. Gas distribution plates that may be adapted to benefit from the invention are described in commonly assigned U.S. patent application Ser. No. 09/922,219, filed Aug. 8, 2001 by Keller et al., U.S. patent application Ser. No. 10/140,324, filed May 6, 2002 by Yim et al., and Ser. No. 10/337,483, filed Jan. 7, 2003 by Blonigan et al., U.S. Pat. No. 6,477,980, issued Nov. 12, 2002 to White et al., U.S. patent application Ser. No. 10/417,592, filed Apr. 16, 2003 by Choi et al., and U.S. patent application Ser. No. 10/823,347, filed on Apr. 12, 2004 by Choi et al., which are hereby incorporated by reference in their entireties.
The gas distribution plate assembly 218 typically includes a diffuser plate (or distribution plate) 258 suspended from a hanger plate 260. The diffuser plate 258 and hanger plate 260 may alternatively comprise a single unitary member. A plurality of gas passages 262 are formed through the diffuser plate 258 to allow a predetermined distribution of gas passing through the gas distribution plate assembly 218 and into the process volume 212. The hanger plate 260 maintains the diffuser plate 258 and the interior surface 220 of the lid assembly 210 in a spaced-apart relation, thus defining a plenum 264 therebetween. The plenum 264 allows gases flowing through the lid assembly 210 to uniformly distribute across the width of the diffuser plate 258 so that gas is provided uniformly above the center perforated area 216 and flows with a uniform distribution through the gas passages 262.
The diffuser plate 258 is typically fabricated from stainless steel, aluminum (Al), anodized aluminum, nickel (Ni) or other RF conductive material. The diffuser plate 258 could be cast, brazed, forged, hot iso-statically pressed or sintered. The diffuser plate 258 is configured with a thickness that maintains sufficient flatness across the aperture 266 as not to adversely affect substrate processing. The thickness of the diffuser plate 258 is between about 0.8 inch to about 2.0 inches. The diffuser plate 258 could be circular for semiconductor wafer manufacturing or polygonal, such as rectangular, for flat panel display manufacturing.
FIG. 3 is a partial sectional view of an exemplary diffuser plate 258 that is described in commonly assigned U.S. patent application Ser. No. 10/417,592, titled “Gas Distribution Plate Assembly for Large Area Plasma Enhanced Chemical Vapor Deposition”, filed on Apr. 16, 2003. The diffuser plate 258 includes a first or upstream side 302 facing the lid assembly 210 and an opposing second or downstream side 304 that faces the support assembly 238. Each gas passage 262 is defined by a first bore 310 coupled by an orifice hole 314 to a second bore 312 that combine to form a fluid path through the gas distribution plate 258. The first bore 310 extends a first depth 330 from the upstream side 302 of the gas distribution plate 258 to a bottom 318. The bottom 318 of the first bore 310 may be tapered, beveled, chamfered or rounded to minimize the flow restriction as gases flow from the first bore into the orifice hole 314. The first bore 310 generally has a diameter of about 0.093 to about 0.218 inches, and in one embodiment is about 0.156 inches.
The second bore 312 is formed in the diffuser plate 258 and extends from the downstream side (or end) 304 to a depth 332 of about 0.10 inch to about 2.0 inches. Preferably, the depth 332 is between about 0.1 inch to about 1.0 inch. The diameter 336 of the second bore 312 is generally about 0.1 inch to about 1.0 inch and may be flared at an angle 316 of about 10 degrees to about 50 degrees. Preferably, the diameter 336 is between about 0.1 inch to about 0.5 inch and the flaring angle 316 is between 20 degrees to about 40 degrees. The surface of the second bore 312 is between about 0.05 inch2 to about 10 inch2 and preferably between about 0.05 inch2 to about 5 inch2. The diameter of second bore 312 refers to the diameter intersecting the downstream surface 304. An example of diffuser plate, used to process 1500 mm by 1850 mm substrates, has second bores 312 at a diameter of 0.250 inch and at a flare angle 316 of about 22 degrees. The distances 380 between rims 382 of adjacent second bores 312 are between about 0 inch to about 0.6 inch, preferably between about 0 inch to about 0.4 inch. The diameter of the first bore 310 is usually, but not limited to, being at least equal to or smaller than the diameter of the second bore 312. A bottom 320 of the second bore 312 may be tapered, beveled, chamfered or rounded to minimize the pressure loss of gases flowing out from the orifice hole 314 and into the second bore 312. Moreover, as the proximity of the orifice hole 314 to the downstream side 304 serves to minimize the exposed surface area of the second bore 312 and the downstream side 304 that face the substrate, the downstream area of the diffuser plate 258 exposed to fluorine provided during chamber cleaning is reduced, thereby reducing the occurrence of fluorine contamination of deposited films.
The orifice hole 314 generally couples the bottom 318 of the first hole 310 and the bottom 320 of the second bore 312. The orifice hole 314 generally has a diameter of about 0.01 inch to about 0.3 inch, preferably about 0.01 inch to about 0.1 inch, and typically has a length 334 of about 0.02 inch to about 1.0 inch, preferably about 0.02 inch to about 0.5 inch. The length 334 and diameter (or other geometric attribute) of the orifice hole 314 is the primary source of back pressure in the plenum 264 which promotes even distribution of gas across the upstream side 302 of the gas distribution plate 258. The orifice hole 314 is typically configured uniformly among the plurality of gas passages 262; however, the restriction through the orifice hole 314 may be configured differently among the gas passages 262 to promote more gas flow through one area of the gas distribution plate 258 relative to another area. For example, the orifice hole 314 may have a larger diameter and/or a shorter length 334 in those gas passages 262, of the gas distribution plate 258, closer to the wall 206 of the processing chamber 202 so that more gas flows through the edges of the perforated area 216 to increase the deposition rate at the perimeter of the glass substrate. The thickness of the diffuser plate is between about 0.8 inch to about 3.0 inches, preferably between about 0.8 inch to about 2.0 inch.
As the size of substrate continues to grow in the TFT-LCD industry, especially, when the substrate size is at least about 1000 mm by about 1200 mm (or about 1,200,000 mm2), film thickness and property uniformity for large area plasma-enhanced chemical vapor deposition (PECVD) becomes more problematic. Examples of noticeable uniformity problems include higher deposition rates and more compressive films in the central area of large substrates for some high deposition rate silicon nitride films. The thickness uniformity across the substrate appears “dome shaped” with film in center region thicker than the edge region. The less compressive film in the edge region has higher Si—H content. The manufacturing requirements for TFT-LCD include low Si—H content, for example <15 atomic %, high deposition rate, for example >1500 Å/min, and low thickness non-uniformity, for example <15%, across the substrate. The Si—H content is calculated from FTIR (Fourier Transform Infra-Red) measurement. The larger substrates have worse “dome shape” uniformity issue. The problem could not be eliminated by process recipe modification to meet all requirements. Therefore, the issue needs to be addressed by modifying the gas and/or plasma distribution.
The process of depositing a thin film in a process chamber is shown in FIG. 4A. The process starts at step 401 by placing a substrate in a process chamber with a diffuser plate. Next at step 402, flow process gas(es) through a diffuser plate toward a substrate supported on a substrate support. Then at step 403, create a plasma between the diffuser plate and the substrate support. At step 404, deposit a thin film on the substrate in the process chamber. FIG. 4B shows a thickness profile of a silicon nitride film across a glass substrate. The size of the substrate is 1500 mm by 1800 mm. The diffuser plate has diffuser holes with design shown in FIG. 3. The diameter of the first bore 310 is 0.156 inch. The length 330 of the first bore 310 is 1.049 inch. The diameter 336 of the second bore 312 is 0.250 inch. The flaring angle 316 of the second bore 312 is 22 degree. The length 332 of the second bore 312 is 0.243 inch. The diameter of the orifice hole 314 is 0.016 inch and the length 334 of the orifice hole 314 is 0.046 inch. The SiN film is deposited using 2800 sccm SiH4, 9600 sccm NH3 and 28000 sccm N2, under 1.5 Torr, and 15000 watts source power. The spacing between the diffuser plate and the support assembly is 1.05 inch. The process temperature is maintained at about 355� C. The deposition rate is averaged to be 2444 Å/min and the thickness uniformity (with 15 mm edge exclusion) is 25.1%, which is higher than the manufacturing specification (<15%). The thickness profile shows a center thick profile, or “dome shape” profile. Table 1 shows the film properties measured from wafers placed on the glass substrate for the above film.
Measurement of thickness and film properties
on a substrate deposited with SiN film.
(Å/min )
Edge I and Edge II represent two extreme ends of the substrate with width at 1800 mm. The refractive index (RI), film stress, Si—H concentration data and wet etch rate (WER) data show a more compressive film near the center region in comparison to the edge region. The Si—H concentrations at the substrate edges are approaching the manufacturing limit of 15%. Wet etch rate is measured by immersing the samples in a BOE (buffered oxide etch) 6:1 solution.
One theory for the cause of the center to edge non-uniformity problem is excess residual gas between diffuser plate and substrate and in the center region of the substrate that could not be pumped away effectively, which may have caused high deposition rate and more compressive film in the center region of the substrate. A simple test has been designed to see if this theory would stand. As shown in FIG. 5, a thermo-resistant tape is used to block of the pumping channels 214 (shown in FIG. 2) near side 501 and side 502 of substrate in a PECVD process chamber. The pumping channels 214 near the other two sides are left open. Due to this, an asymmetric gas pumping situation was created. If the cause of the “dome shape” problem is due to excess residual gas that could not be pumped away at the edge of the substrate, the use of thermo-resistant tape near two edges of the substrate should worsen the uniformity issue and cause worse uniformity across the substrate. However, little changes has been observed comparing the deposition results between deposition done with 2 pumping channels blocked and deposition with all pumping channel opened (see Table 2). The diffuser plate used here has the same design and dimensions as the one used for FIG. 4B and Table 1. The SiN films in Table 2 are deposited using 3300 sccm SiH4, 28000 sccm NH3 and 18000 sccm N2, under 1.3 Torr, and 11000 watts source power. The spacing between the diffuser plate and the support assembly is 0.6 inch. The process temperature is maintained at about 355� C. Film thickness and properties are measured on location 1, 2, 3, 4 and 5 (as shown in FIG. 5) on the substrates. The SiH content shown is Table 2 is measured in atomic %.
SiN thickness and film properties comparison between deposition with all
pumping channels open and with 2 pumping channels closed.
2 pumping channels blocked
The results in Table 2 show little difference between the deposition done with 2 pumping channels blocked and deposition with all pumping channel opened. In addition, there is little difference between measurement collected at locations 1 and 5, which should be different if residual gas is the cause of the problem. Therefore, the theory of excess residual gas between diffuser and substrate and in the center region of the substrate not being pumped away effectively is ruled out.
Another possible cause for the center to edge non-uniformity is plasma non-uniformity. Deposition of films by PECVD depends substantially on the source of the active plasma. Dense chemically reactive plasma can be generated due to hollow cathode effect. The driving force in the RF generation of a hollow cathode discharge is the frequency modulated d.c. voltage Vs (the self-bias voltage) across the space charge sheath at the RF electrode. A RF hollow cathode and oscillation movement of electrons between repelling electric fields, Es, of the opposite sheaths are shown schematically in FIG. 6A. An electron emitted from the cathode wall, which could be the walls of the reactive gas passages that are close to the process volume 212, is accelerated by the electric field Es across the wall sheath “δ”. The electron oscillates across the inner space between walls of the electrode owing to the repelling fields of the opposite wall sheaths. The electron loses energy by collisions with the gas and creates more ions. The created ions can be accelerated to the cathode walls thereby enhancing emissions of secondary electrons, which could create additional ions. Overall, the cavities between the cathode walls enhance the electron emission and ionization of the gas. Flared-cone shaped cathode walls, with gas inlet diameter smaller than the gas outlet diameter, are more efficient in ionizing the gas than cylindrical walls. The potential Ez is created due to difference in ionization efficiency between the gas inlet and gas outlet.
By changing the design of the walls of the hollow cathode cavities, which faces the substrate and are at the downstream ends of the gas diffuser holes (or passages), that are close to the process volume 212 and the arrangement (or density) of the hollow cathode cavities, the gas ionization could be modified to control the film thickness and property uniformity. An example of the walls of the hollow cathode cavities that are close to the process volume 212 is the second bore 312 of FIG. 3. The hollow cathode effect mainly occurs in the flared cone 312 that faces the process volume 212. The FIG. 3 design is merely used as an example. The invention can be applied to other types of hollow cathode cavity designs. Other examples of hollow cathode cavity design include, but not limited to, the designs shown in FIGS. 6B-6G. By varying the volume and/or the surface area of the hollow cathode cavity, the plasma ionization rate can be varied.
Using the design in FIG. 3 as an example, the volume of second bore (or hollow cathode cavity) 312 can be changed by varying the diameter “D” (or diameter 336 in FIG. 3), the depth “d” (or length 332 in FIG. 3) and the flaring angle “α” (or flaring angle 316 of FIG. 3), as shown in FIG. 7A. Changing the diameter, depth and/or the flaring angle would also change the surface area of the bore 312. Since the center of substrate has higher deposition rate and is more compressive, higher plasma density is likely the cause. By reducing the bore depth, the diameter, the flaring angle, or a combination of these three parameters from edge to center of the diffuser plate, the plasma density could be reduced in the center region of the substrate to improve the film thickness and film property uniformities. Reducing the cone (or bore) depth, cone diameter, flaring angle also reduces the surface area of the bore 312. FIGS. 7B, 7C and 7D show 3 diffuser passage (or diffuser hole) designs that are arranged on a diffuser plate shown in FIG. 7E. FIGS. 7B, 7C and 7D designs have the same cone (or bore) diameter, but the cone (or bore) depth and total cone (bore) surface areas are largest for FIG. 7B design and smallest for FIG. 7D design. The cone flaring angles have been changed to match the final cone diameter. The cone depth for FIG. 7B is 0.7 inch. The cone depth for FIG. 7C is 0.5 inch and the cone depth for FIG. 7D is 0.325 inch. The smallest rectangle 710 in FIG. 7E is 500 mm by 600 mm and the diffuser holes have cone depth 0.325 inch, cone diameter 0.302 inch and flare angel 45� FIG. 7D). The medium rectangle in FIG. 7E is 1000 mm by 1200 mm. The diffuser holes in the area 720 between the medium rectangle and the smallest rectangle have cone depth 0.5 inch, cone diameter 0.302 inch and flare angle 30� (See FIG. 7C). The largest rectangle in Figure is 1500 mm by 1800 mm. The diffuser holes in the area 730 between the largest rectangle and the medium rectangle have cone depth 0.7 inch, cone diameter 0.302 inch and flare angle 22� (See FIG. 7B) The orifice holes diameters are all 0.03 inch and holes depths are all 0.2 inch for FIGS. 7B, 7C and 7D. The thickness of the three diffuser plates are all 1.44 inch. The diameters for first bore 310 of FIGS. 7B, 7C and 7D are all 0.156 inch and the depth are 0.54 inch (FIG. 7B), 0.74 inch (FIG. 7C) and 0.915 inch (FIG. 7C) respectively.
FIG. 8 shows the deposition rate across the substrate. Region I correlates to the area under “0.325 inch depth” cones, while regions II and III correlates to “0.5 inch depth” (region II) and “0.7 inch depth” (region II) respectively. Table 3 shows the measurement of film thickness and properties across the substrate. The SiN film in Table 3 is deposited using 3300 sccm SiH4, 28000 sccm NH3 and 18000 sccm N2, under 1.3 Torr, and 11000 watts source power. The spacing between the diffuser plate and the support assembly is 0.6 inch. The process temperature is maintained at about 355� C. The locations 1, 2, 3, 4 and 5 are the same locations indicated in FIG. 5.
SiN film thickness and property measurement
with diffuser plate with 3 regions of varying cone depths.
The results show that reducing the cone depth and cone surface area reduces the deposition rate. The results also show that reducing the volume and/or surface area of hollow cathode cavity reduces the deposition rate. The reduction of the plasma deposition rate reflects a reduction in plasma ionization rate. Since the change of cone depth and total cone surface area from region I to region II to region III is not smooth, the deposition rates across the substrate shows three regions. Regions I, II and III on the substrate match the diffuser holes regions 710, 720 and 730. This indicates that changing the hollow cathode cavity design can change the plasma ionization rate and also the importance of making the changes smooth and gradual.
There are many ways to gradually change hollow cathode cavities from inner regions of the diffuser plate to the outer regions of the diffuser plate to improve plasma uniformity. One way is to first bend the diffuser plate, which has identical gas diffusing passages across the diffuser plate, to a pre-determined curvature and afterwards machine out the curvature to leave the surface flat. FIG. 9A shows the process flow of this concept. The process starts by bending the diffuser plate to make it convex at step 901, followed by machining out the curvature of the convex diffuser plate to make the diffuser plate surface flat at step 902. FIG. 9B shows a schematic drawing of a convex diffuser plate with an exemplary diffuser hole (or gas passage) 911 at the edge (and outer region) and an exemplary diffuser hole 912 in the center (and inner region) as diffuser holes. The diffuser holes 911 and 912 are identical before the bending process and are simplified drawings of diffuser holes as shown in FIGS. 3 and 7A. However, the invention can be used for any diffuser holes designs. The design in FIG. 3 is merely used for example. Diffuser plate downstream surface 304 faces the process volume 212. The gradual changing distance between the 913 surface and the flat 914 surface (dotted due to its non-existence) shows the curvature. The edge diffuser cone 915 and center diffuser cone 916 are identical in size and shape prior to the bending process. FIG. 9C shows the schematic drawing of a diffuser plate after the curvature has been machined out. The surface facing the process volume 212 is machined to 914 (a flat surface), leaving center cone 918 significantly shorter than the edge cone 917. Since the change of the cone size (volume and/or surface area) is created by bending the diffuser plate followed by machining out the curvature, the change of the cone size (volume and/or surface area) from center to edge is gradual. The center cone 918 would have diameter “D” and depth “d” smaller than the edge cone 917. The definition of cone diameter “D” and cone depth “d” can be found in the description of FIG. 7A.
FIG. 9D shows the depth “d” of the bores 312 (or cone) that extend to the downstream side of an exemplary diffuser plate, which is used to process 1500 mm by 1850 mm substrates. The diffuser plate has diffuser holes with design shown in FIG. 7A. The diameter of the first bore 310 is 0.156 inch. The length 330 of the first bore 310 is 1.049 inch. The diameter 336 of the second bore 312 is 0.250 inch. The flaring angle 316 of the second bore 312 is 22 degree. The length 332 of the second bore 312 is 0.243 inch. The diameter of the orifice hole 314 is 0.016 inch and the length 334 of the orifice hole 314 is 0.046 inch. The measurement of depths of the second bores in FIG. 9D shows a gradual increasing of bore depth 332 (or “d” in FIG. 7A) from center of the diffuser plate to the edge of the diffuser plate. Due to the bending and machining processes, the diameter 336 (or “D” in FIG. 7A) of the bore 312 also gradually increases from center of the diffuser plate to the edge of the diffuser plate.
FIG. 9E shows the thickness distribution across a substrate deposited with SiN film under a diffuser plate with a design described in FIGS. 9B, 9C and 9D. The size of substrate is 1500 mm by 1850 mm, which is only slightly larger than the size of substrate (1500 mm by 1800 mm) in FIG. 4B and Table 1. Typically, the diffuser plate sizes scale with the substrate sizes. The diffuser plate used to process 1500 mm by 1850 mm substrates is about 1530 mm by 1860 mm, which is slightly larger than the diffuser plate used to process 1500 mm by 1800 mm substrates (diffuser plate about 1530 mm by 1829 mm). The thickness uniformity is improved to 5.0%, which is much smaller than 25.1% for film in FIG. 4B. Table 4 shows the film property distribution across the substrate. The diffuser plate has diffuser holes with design shown in FIG. 7A. The diameter of the first bore 310 is 0.156 inch. The length 330 of the first bore 310 is 1.049 inch. The diameter 336 of the second bore 312 is 0.250 inch. The flaring angle 316 of the second bore 312 is 22 degree. The length 332 of the second bore 312 is 0.243 inch. The diameter of the orifice hole 314 is 0.016 inch and the length 334 of the orifice hole 314 is 0.046 inch. The SiN films in FIG. 9E and Table 4 are deposited using 2800 sccm SiH4, 9600 sccm NH3 and 28000 sccm N2, under 1.5 Torr, and 15000 watts source power. The spacing between the diffuser plate and the support assembly is 1.05 inch. The process temperature is maintained at about 355� C. Edge I and Edge II represent two extreme ends of the substrate, as described in Table 1 measurement. The film thickness and property data in Table 4 show much smaller center to edge variation compared to the data in Table 1.
plate with gradually varied bore depths and diameters
from center to edge for a 1500 mm by 1850 mm substrate.
Comparing the data in Table 4 to the data in Table 1, which are collected from deposition with a diffuser plate with the same diameters and depths of bores 312 across the diffuser plate, the variation of thickness, stress, Si—H content and wet etch rate (WER) are all much less for the data in Table 4, which is collected from deposition with a diffuser plate with gradually increasing diameters and depths of bore 312 from the center to the edge of the diffuser plate. The results show that uniformity for thickness and film properties can be greatly improved by gradually increasing the diameters and depths of the bores, which extend to the downstream side of the diffuser plate, from center to edge. The wet etch rates in the tables are measured by immersing the samples in a BOE 6:1 solution.
FIG. 9F shows the depth “d” measurement of the bores 312 across an exemplary diffuser plate, which is used to process 1870 mm by 2200 mm substrates Curve 960 shows an example of an ideal bore depth distribution the diffuser plate. The measurement of depths of the bores in FIG. 9F shows a gradual increasing of bore depth from center of the diffuser plate to the edge of the diffuser plate. The downstream bore diameter would also gradually increase from center of the diffuser plate to the edge of the diffuser plate.
FIG. 9G shows the thickness distribution across a substrate deposited with SiN film under a diffuser plate with a design similar to the one described in FIGS. 9B, 9C and 9F. The size of the substrate is 1870 mm by 2200 mm. Table 5 shows the film property distribution across the substrate. The diffuser plate has diffuser holes with design shown in FIG. 7A. The diameter of the first bore 310 is 0.156 inch. The length 330 of the first bore 310 is 0.915 inch. The diameter 336 of the second bore 312 is 0.302 inch. The flaring angle 316 of the second bore 312 is 22 degree. The length 332 of the second bore 312 is 0.377 inch. The diameter of the orifice hole 314 is 0.018 inch and the length 334 of the orifice hole 314 is 0.046 inch. The SiN films in Table 5 are deposited using 5550 sccm SiH4, 24700 sccm NH3 and 61700 sccm N2, under 1.5 Torr, and 19000 watts source power. The spacing between the diffuser plate and the support assembly is 1.0 inch. The process temperature is maintained at about 350� C. Edge I and Edge II represent two extreme ends of the substrate, as described in Table 1 measurement. The film thickness and property data in Table 5 show much smaller center to edge variation compared to the data in Table 1. The thickness uniformity is 9.9%, which is much better than 25.1% for film in FIG. 4B. The data shown in FIG. 4B and Table 1 are film thickness and property data on smaller substrate (1500 mm by 1800 mm), compared to the substrate (1870 mm by 2200 mm) for data in FIG. 9G and Table 5. Thickness and property uniformities are expected to be worse for larger substrate. The uniformity of 9.9% and the improved film property data in Table 5 by the new design show that the new design, with gradual increasing diameters and depths of diffuser bores extended to the downstream side of the diffuser plate, greatly improves the plasma uniformity and process uniformity.
from center to edge for an 1870 mm by 2200 mm substrate.
Although the exemplary diffuser plate described here is rectangular, the invention applies to diffuser plate of other shapes and sizes. One thing to note is that the convex downstream surface does not have to be machined to be completely flat across the entire surface. As long as the diameters and depths of the bores are increased gradually from center to edge of the diffuser plate, the edge of the diffuser plate could be left un-flattened.
There are also many ways to create curvature of the diffuser plate. One way is to thermally treat the diffuser plate at a temperature that the diffuser plate softens, such as a >400� C. temperature for aluminum, for a period of time by supporter only the edge of the diffuser plate. When the metal diffuser plate softens under the high temperature treatment, the gravity would pull center of the diffuser plate down and the diffuser plate would become curved. FIG. 10A shows the process flow 1000 of such thermal treatment. First, at step 1001 place the diffuser plate, which already has diffuser holes in it, in an environment 1005 or chamber that could be thermally controlled and place the diffuser plate 1010 on a support 1020 that only support the edge of the diffuser plate (See FIG. 10B). The diffuser plate facing down is the downstream surface 304 of the diffuser plate. Afterwards at step 1002, raise the temperature of the environment and treat the diffuser plate at a thermal condition at a temperature that the diffuser plate softens. One embodiment is to keep the thermal environment at a constant treatment temperature (iso-thermal), once the constant treatment temperature has been reached. After the curvature of the diffuser plate has reached the desired curvature, stop the thermal treatment process at step 1003. Note that in the thermal environment, optional diffuser support 1030 could be placed under diffuser plate 1010 at support height 1035 lower than the support height 1025 of support 1020 and at a support distance 1037 shorter than the support distance 1027 of support 1020. The optional support 1030 could help determine the diffuser curvature and could be made of elastic materials that could withstand temperature greater than 400� C. (the same temperature as the thermal conditioning temperature) and would not damage the diffuser plate surface. FIG. 10C shows that the curved diffuser plate 1010 resting on the diffuser plate supports 1020 and 1030 after the bending process.
Another way to create curvature is to use vacuum to smoothly bend the diffuser plate to a convex shape. FIG. 11A shows the process flow 1100 of such bending by vacuum process. First, at step 1101 place the diffuser plate, which already has diffuser holes in it and the downstream side 304 facing down, on a vacuum assembly 1105 and seal the upstream end 302 of the diffuser plate with a cover. The material used to cover (or seal) the upstream end of the diffuser plate must be strong enough to keep its integrity under vacuum. The vacuum assembly only supports the diffuser plate at the edge (See FIG. 11B) by diffuser plate holder 1120. The vacuum assembly 1105 is configured to have a pump channel 1150 to pull vacuum in the volume 1115 between the diffuser plate and the vacuum assembly 1105 when the upstream end of the diffuser plate is covered. The pumping channel 1150 in FIGS. 11B and 11C are merely used to demonstrate the concept. There could be more than one pumping channels placed at different locations in the vacuum assembly 1105. Afterwards at step 1102, pull vacuum in the volume 1115 between the diffuser plate and the diffuser plate holder. When the curvature of the diffuser plate has reached the desired curvature, stop the vacuuming process at step 1103 and restore the pressure of the volume 1115 between the diffuser plate and the vacuum assembly to be equal to the surrounding environment 1140 to allow the diffuser plate to be removed from the vacuum assembly 1105. Note that in the vacuum assembly, optional diffuser support 1130 could be placed under diffuser plate 1110 at support height 1135 lower than the support height 1125 of the diffuser plate support 1120 and at a support distance 1137 shorter than the support distance 1127 of support 1120. The optional support could help determine the diffuser curvature and could be made of materials, such as rubber, that would not damage the diffuser plate surface. FIG. 11C shows that the curved diffuser plate 1110 resting on the diffuser plate supports 1120 and 1130 after the bending process.
Another way to change the downstream cone (312 in FIG. 3) depth, cone diameter, cone flaring angle or a combination of these three parameters is by drilling the diffuser holes with varying cone depth, cone diameter or cone flaring angles from center of the diffuser plate to the edge of the diffuser plate. The drilling can be achieved by computer numerically controlled (CNC) machining. FIG. 12A shows the process flow of such a process 1200. The process 1200 starts at step 1230 by creating bores that extend to the downstream side of a diffuser plate with gradually increasing bore depths and/or bore diameters from center to edge of the diffuser plate. The flaring angle can also be varied from center to edge of the diffuser plate. Next at step 1240, the process is completed by creating the remaining portions of the gas passages of the diffuser plate. The downstream cones can be created by using drill tools. If drill tools with the same flaring angle are used across the diffuser plate, the cone flaring angles would stay constant and cone depth and cone diameter are varied. The cone diameter would be determined by the flaring angle and cone depth. The important thing is to vary the cone depth smoothly and gradually to ensure smooth deposition thickness and film property change across the substrate. FIG. 12B shows an example of varying cone depths and cone diameters. Diffuser hole 1201 is near the center of the diffuser plate and has the smallest cone depth 1211 and cone diameter 1221. Diffuser hole 1202 is between the center and edge of the diffuser plate and has the medium cone depth 1212 and cone diameter 1222. Diffuser hole 1203 is near the edge of the diffuser plate and has the largest cone depth 1213 and cone diameter 1223. The cone flaring angle of all diffuser holes are the same for the design in FIG. 12B. However, it is possible to optimize deposition uniformity by varying the cone design across the diffuser plate by varying both the cone diameters, cone depths and flaring angles. Changing the cone depth, cone diameter and cone flaring angle affects the total cone surface area, which also affects the hollow cathode effect. Smaller cone surface area lowers the plasma ionization efficiency.
Yet another way to change the downstream bore (312 in FIG. 3) depth (“d”), and bore diameter (“D”) is by drilling identical diffuser holes across the diffuser plate (see FIG. 12C). In FIG. 12C, the gas diffuser hole 1251 at the edge (at outer region) of the diffuser plate is identical to the gas diffuser hole 1252 at the center (at inner region) of the diffuser plate. The downstream bore 1255 is also identical to downstream bore 1256. The downstream surface 1254 of gas diffuser plate is initially flat. Afterwards, machine downstream side of the diffuser plate to make a concave shape with center thinner than the edge. The machining can be achieved by computer numerically controlled machining or other types of controlled machining to make the machining process repeatable. After machining the downstream surface 1254 to a concave shape (surface 1259), the downstream bore 1258 at the center (an inner region) of the diffuser plate has smaller diameter (“D”) and smaller length (“d”) than the downstream bore 1257 at the edge (an outer region) of the diffuser plate. The diffuser plate can be left the way it is as in FIG. 12D, or downstream surface 1259 can be pulled flat as shown in FIG. 12E, or to other curvatures (not shown), to be used in a process chamber to achieve desired film results.
Yet another way to change the downstream bore (312 in FIG. 3) depth (“d”), and bore diameter (“D”) is by bending the diffuser plate without any diffuser hole into concave shape (See FIG. 12F). In FIG. 12F, the downstream surface is surface 1269. Afterwards, drill the downstream bores to the same depth using the same type of drill from a fictitious flat surface 1264 (See FIG. 12G). Although downstream bore 1268 at the center of the diffuser plate is drilled to the same depth from the fictitious surface 1264 as the downstream bore 1267, the diameter and length of the downstream bore 1268 are smaller than the diameter and length of the downstream bore 1267. The rest of the diffuser holes, which include orifice holes 1265, upstream bores 1263, and connecting bottoms, are machined to complete the diffuser holes. All orifice holes and upstream bores should have identical diameters, although it is not necessary. The diameters and lengths of the orifice holes should be kept the same across the diffuser plate (as shown in FIG. 12G). The orifice holes controls the back pressure. By keeping the diameters and the lengths of the orifice holes the same across the diffuser plate, the back pressure, which affects the gas flow, can be kept the same across the diffuser plate. The diffuser plate can be left the way it is as in FIG. 12G, or downstream surface 1269 can be pulled flat as shown in FIG. 12H, or to other curvatures (not shown), to be used in a process chamber to achieve desired film results.
The changes of diameters and/or lengths of the hollow cathode cavities do not have to be perfectly continuous from center of the diffuser plate to the edge of the diffuser plate, as long the changes are smooth and gradual. It can be accomplished by a number of uniform zones arranged in a concentric pattern as long as the change from zone to zone is sufficiently small. But, there need to be an overall increase of size (volume and/or surface area) of hollow cathode cavity from the center of the diffuser plate to the edge of the diffuser plate. FIG. 12I shows a schematic plot of bottom view (looking down at the downstream side) of a diffuser plate. The diffuser plate is divided into N concentric zones. Concentric zones are defined as areas between an inner and an outer boundaries, which both have the same geometric shapes as the overall shape of the diffuser plate. Within each zone, the diffuser holes are identical. From zone 1 to zone N, the hollow cathode cavity gradually increase in size (volume and/or surface area). The increase can be accomplished by increase of hollow cathode cavity diameter, length, flaring angle, or a combination of these parameters.
The increase of diameters and/or lengths of the hollow cathode cavities from center to edge of the diffuser plate also do not have to apply to all diffuser holes, as long as there is an overall increase in the size (volume and/or surface area) of hollow cathode cavities per downstream diffuser plate surface area of the hollow cathode cavities. For example, some diffuser holes could be kept the same throughout the diffuser plate, while the rest of the diffuser holes have a gradual increase in the sizes (volumes and/or surface areas) of the hollow cathode cavities. In another example, the diffuser holes have a gradual increase in sizes (volumes and/or surface areas) of the hollow cathode cavities, while there are some small hollow cathode cavities at the edge of the diffuser plate, as shown in FIG. 12J. Yet in another example, most of the hollow cathode cavities are uniform across the diffuser plate, while there are a few larger hollow cathode cavities towards the edge of the diffuser plate, as shown in FIG. 12K.
We can define the hollow cathode cavity volume density as the volumes of the hollow cathode cavities per downstream diffuser plate surface area of the hollow cathode cavities. Similarly, we can define the hollow cathode cavity surface area density of the hollow cathode cavity as the total surface areas of the hollow cathode cavities per downstream diffuser plate surface area of the hollow cathode cavities. The results above show that plasma and process uniformities can be improved by gradual increase in either the hollow cathode cavity volume density or the hollow cathode cavity surface area density of the hollow cathode cavities from the inner regions to the outer regions of the diffuser plate, or from center to edge of the diffuser plate.
Another way to change the film deposition thickness and property uniformity is by changing the diffuser holes density across the diffuser plate, while keeping the diffuser holes identical. The density of diffuser holes is calculated by dividing the total surface of holes of bores 312 intersecting the downstream side 304 by the total surface of downstream side 304 of the diffuser plate in the measured region. The density of diffuser holes can be varied from about 10% to about 100%, and preferably varied from 30% to about 100%. To reduce the “dome shape” problem, the diffuser holes density should be lowered in the inner region, compared to the outer region, to reduce the plasma density in the inner region. The density changes from the inner region to the outer region should be gradual and smooth to ensure uniform and smooth deposition and film property profiles. FIG. 13 shows the gradual change of diffuser holes density from low in the center (region A) to high at the edge (region B). The lower density of diffuser holes in the center region would reduce the plasma density in the center region and reduce the “dome shape” problem. The arrangement of the diffuser holes in FIG. 13 is merely used to demonstrate the increasing diffuser holes densities from center to edge. The invention applies to any diffuser holes arrangement and patterns. The density change concept can also be combined with the diffuser hole design change to improve center to edge uniformity. When the density of the gas passages is varied to achieve the plasma uniformity, the spacing of hollow cathode cavities at the down stream end could exceed 0.6 inch.
The inventive concept of gradual increase of hollow cathode cavity size (volume and/or surface area) from the center of the diffuser plate to the edge of the diffuser plate can be accomplished by a combination of the one of the hollow cathode cavity size (volume and/or surface area) and shape variation, with or without the diffuser hole density variation, with one of the diffuser plate bending method, and with one of the hollow cathode cavity machining methods applicable. For example, the concept of increasing density of diffuser holes from the center to the edge of the diffuser plate can be used increasing the diameter of the hollow cathode cavity (or downstream bore) from the center to the edge of the diffuser plate. The diffuser plate could be kept flat and the diffuser holes are drilled by CNC method. The combination is numerous. Therefore, the concept is very capable of meeting the film thickness and property uniformity requirements.
Up to this point, the various embodiments of the invention are mainly described to increase the diameters and lengths of the hollow cathode cavities from center of the diffuser plate to the edge of the diffuser plate to improve the plasma uniformity across the substrate. There are situations that might require the diameter and the lengths of the hollow cathode cavities to decrease from the center of the diffuser plate to the edge of the diffuser plate. For example, the power source might be lower near the center of the substrate and the hollow cathode cavities need to be larger to compensate for the lower power source. The concept of the invention, therefore, applies to decreasing the sizes (volumes and/or areas) hollow cathode cavities from the center of the diffuser plate to the edge of the diffuser plate.
The concept of the invention applies to any design of gas diffuser holes, which includes any design of hollow cathode cavity, and any shapes/sizes of gas diffuser plates. The concept of the invention applies to a diffuser plate that utilizes multiple designs of gas diffuser holes, which include multiple designs of hollow cathode cavities. The concept of the invention applies to diffuser plate of any curvatures and diffuser plate made of any materials, for example, aluminum (Al), tungsten (W), chromium (Cr), tantalum (Ta), or combinations thereof, among others, and by any methods, for example, cast, brazed, forged, hot iso-statically pressed or sintered. The concept of the invention also applies to diffuser plate made of multiple layers of materials that are pressed or glued together. In addition, the concept of the invention can be used in a chamber that could be in a cluster system, a stand-alone system, an in-line system, or any systems that are applicable.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3830194Sep 28, 1972Aug 20, 1974Applied Materials TechSusceptor support structure and docking assemblyUS3854443Dec 19, 1973Dec 17, 1974Intel CorpGas reactor for depositing thin filmsUS4474358Oct 27, 1981Oct 2, 1984Bennett Arthur MValvesUS4491520Feb 22, 1984Jan 1, 1985Jaye Richard CFilter for water jugsUS4522149Nov 21, 1983Jun 11, 1985General Instrument Corp.Reactor and susceptor for chemical vapor deposition processUS4563367May 29, 1984Jan 7, 1986Applied Materials, Inc.Apparatus and method for high rate deposition and etchingUS4726924Apr 14, 1986Feb 23, 1988The Boeing CompanyMethod of planar forming of zero degree composite tapeUS4763690Jun 11, 1987Aug 16, 1988Harsco CorporationLeak-proof valve for gas cylindersUS4780169May 11, 1987Oct 25, 1988Tegal CorporationNon-uniform gas inlet for dry etching apparatusUS4792378Dec 15, 1987Dec 20, 1988Texas Instruments IncorporatedGas dispersion disk for use in plasma enhanced chemical vapor deposition reactorUS4799418Aug 21, 1987Jan 24, 1989Mitsuba Electric Mfg. Co., Ltd.Vacuum actuator for vehicle speed controlUS4809421May 22, 1986Mar 7, 1989Precision Brand Products, Inc.Slotted shimUS4854263Aug 14, 1987Aug 8, 1989Applied Materials, Inc.Inlet manifold and methods for increasing gas dissociation and for PECVD of dielectric filmsUS4927991Nov 10, 1987May 22, 1990The Pillsbury CompanySusceptor in combination with grid for microwave oven packageUS4993358Jul 28, 1989Feb 19, 1991Watkins-Johnson CompanyChemical vapor deposition reactor and method of operationUS5000113Dec 19, 1986Mar 19, 1991Applied Materials, Inc.Thermal CVD/PECVD reactor and use for thermal chemical vapor deposition of silicon dioxide and in-situ multi-step planarized processUS5044943Aug 16, 1990Sep 3, 1991Applied Materials, Inc.Spoked susceptor support for enhanced thermal uniformity of susceptor in semiconductor wafer processing apparatusUS5124635Feb 13, 1991Jun 23, 1992Photon Dynamics, Inc.Voltage imaging system using electro-opticsUS5152504Sep 11, 1991Oct 6, 1992Janis Research Company, Inc.Vacuum valveUS5173580Nov 15, 1990Dec 22, 1992The Pillsbury CompanySusceptor with conductive border for heating foods in a microwave ovenUS5248371Aug 13, 1992Sep 28, 1993General Signal CorporationHollow-anode glow discharge apparatusUS5268034Mar 24, 1992Dec 7, 1993Lsi Logic CorporationFluid dispersion head for CVD appratusUS5332443Jun 9, 1993Jul 26, 1994Applied Materials, Inc.Lift fingers for substrate processing apparatusUS5339387Oct 24, 1991Aug 16, 1994Abekas Video Systems, Inc.Planar color gradients constructed as an arbitrary function of a distance function from an arbitrary 2-D curvilinear functionUS5399387Apr 13, 1994Mar 21, 1995Applied Materials, Inc.Plasma CVD of silicon nitride thin films on large area glass substrates at high deposition ratesUS5421893Nov 29, 1993Jun 6, 1995Applied Materials, Inc.Susceptor drive and wafer displacement mechanismUS5439524Apr 5, 1993Aug 8, 1995Vlsi Technology, Inc.Plasma processing apparatusUS5500256May 24, 1995Mar 19, 1996Fujitsu LimitedDry process apparatus using plural kinds of gasUS5503809Apr 19, 1993Apr 2, 1996John T. TowlesCompact ozone generatorUS5552017 *Nov 27, 1995Sep 3, 1996Taiwan Semiconductor Manufacturing CompanyMethod for improving the process uniformity in a reactor by asymmetrically adjusting the reactant gas flowUS5567243Jun 6, 1995Oct 22, 1996Sony CorporationApparatus for producing thin films by low temperature plasma-enhanced chemical vapor deposition using a rotating susceptor reactorUS5582866Apr 14, 1994Dec 10, 1996Applied Materials, Inc.Single substrate vacuum processing apparatus having improved exhaust systemUS5611865Feb 14, 1996Mar 18, 1997Applied Materials, Inc.Alignment of a shadow frame and large flat substrates on a heated supportUS5614026Mar 29, 1996Mar 25, 1997Lam Research CorporationShowerhead for uniform distribution of process gasUS5614055Aug 27, 1993Mar 25, 1997Applied Materials, Inc.High density plasma CVD and etching reactorUS5628829Jun 3, 1994May 13, 1997Materials Research CorporationMethod and apparatus for low temperature deposition of CVD and PECVD filmsUS5628869May 9, 1994May 13, 1997Lsi Logic CorporationPlasma enhanced chemical vapor reactor with shaped electrodesUS5647911Dec 14, 1993Jul 15, 1997Sony CorporationGas diffuser plate assembly and RF electrodeUS5714408Dec 13, 1996Feb 3, 1998Denso CorporationMethod of forming silicon nitride with varied hydrogen concentrationUS5766364Jul 15, 1997Jun 16, 1998Matsushita Electric Industrial Co., Ltd.Plasma processing apparatusUS5819434Apr 25, 1996Oct 13, 1998Applied Materials, Inc.Etch enhancement using an improved gas distribution plateUS5820686Feb 2, 1996Oct 13, 1998Moore Epitaxial, Inc.Multi-layer susceptor for rapid thermal process reactorsUS5844205Apr 19, 1996Dec 1, 1998Applied Komatsu Technology, Inc.Heated substrate support structureUS5846332Jul 12, 1996Dec 8, 1998Applied Materials, Inc.Thermally floating pedestal collar in a chemical vapor deposition chamberUS5876838Dec 27, 1996Mar 2, 1999Lsi Logic CorporationSemiconductor integrated circuit processing wafer having a PECVD material layer of improved thickness uniformityUS5882411Oct 21, 1996Mar 16, 1999Applied Materials, Inc.Faceplate thermal choke in a CVD plasma reactorUS5928732Apr 10, 1995Jul 27, 1999Applied Materials, Inc.Method of forming silicon oxy-nitride films by plasma-enhanced chemical vapor depositionUS5950925Oct 10, 1997Sep 14, 1999Ebara CorporationReactant gas ejector headUS5968276Jul 11, 1997Oct 19, 1999Applied Materials, Inc.Heat exchange passage connectionUS5990016Dec 23, 1997Nov 23, 1999Samsung Electronics Co., Ltd.Dry etching method and apparatus for manufacturing a semiconductor deviceUS5994678Feb 12, 1997Nov 30, 1999Applied Materials, Inc.Apparatus for ceramic pedestal and metal shaft assemblyUS5997649Apr 9, 1998Dec 7, 1999Tokyo Electron LimitedStacked showerhead assembly for delivering gases and RF power to a reaction chamberUS6024799Jul 11, 1997Feb 15, 2000Applied Materials, Inc.Chemical vapor deposition manifoldUS6030508May 20, 1998Feb 29, 2000Taiwan Semiconductor Manufacturing CompanySputter etching chamber having a gas baffle with improved uniformityUS6040022Apr 14, 1998Mar 21, 2000Applied Materials, Inc.PECVD of compounds of silicon from silane and nitrogenUS6041733Oct 24, 1997Mar 28, 2000Samsung Electronics, Co., Ltd.Plasma processing apparatus protected from discharges in association with secondary potentialsUS6050506 *Feb 13, 1998Apr 18, 2000Applied Materials, Inc.Pattern of apertures in a showerhead for chemical vapor depositionUS6079356 *Feb 13, 1998Jun 27, 2000Applied Materials, Inc.Reactor optimized for chemical vapor deposition of titaniumUS6113700Dec 15, 1998Sep 5, 2000Samsung Electronics Co., Ltd.Gas diffuser having varying thickness and nozzle density for semiconductor device fabrication and reaction furnace with gas diffuserUS6123775Jun 30, 1999Sep 26, 2000Lam Research CorporationReaction chamber component having improved temperature uniformityUS6132512Jan 8, 1998Oct 17, 2000Ebara CorporationVapor-phase film growth apparatus and gas ejection headUS6140255Mar 3, 1999Oct 31, 2000Advanced Micro Devices, Inc.Method for depositing silicon nitride using low temperaturesUS6148765Sep 9, 1999Nov 21, 2000Lam Research CorporationElectrode for plasma processes and method for manufacture and use thereofUS6149365Sep 21, 1999Nov 21, 2000Applied Komatsu Technology, Inc.Support frame for substratesUS6150283Aug 23, 1999Nov 21, 2000Seiko Epson CorporationThin film transistor fabrication method, active matrix substrate fabrication method, and liquid crystal display deviceUS6170432Jan 24, 2000Jan 9, 2001M.E.C. Technology, Inc.Showerhead electrode assembly for plasma processingUS6176668May 20, 1998Jan 23, 2001Applied Komatsu Technology, Inc.In-situ substrate transfer shuttleUS6182602May 29, 1997Feb 6, 2001Applied Materials, Inc.Inductively coupled HDP-CVD reactorUS6182603Jul 13, 1998Feb 6, 2001Applied Komatsu Technology, Inc.Surface-treated shower head for use in a substrate processing chamberUS6197151May 5, 2000Mar 6, 2001Hitachi, Ltd.Plasma processing apparatus and plasma processing methodUS6203622Jan 11, 2000Mar 20, 2001Asm America, Inc.Wafer support systemUS6228438Sep 22, 1999May 8, 2001Unakis Balzers AktiengesellschaftPlasma reactor for the treatment of large size substratesUS6232218Aug 19, 1999May 15, 2001Micron Technology, Inc.Etch stop for use in etching of silicon oxideUS6254742Jul 12, 1999Jul 3, 2001Semitool, Inc.Diffuser with spiral opening pattern for an electroplating reactor vesselUS6281469Jul 23, 1999Aug 28, 2001Unaxis Balzers AktiengesellschaftCapacitively coupled RF-plasma reactorUS6302057Sep 15, 1998Oct 16, 2001Tokyo Electron LimitedApparatus and method for electrically isolating an electrode in a PECVD process chamberUS6338874Dec 14, 1995Jan 15, 2002Applied Materials, Inc.Method for multilayer CVD processing in a single chamberUS6344420Mar 14, 2000Feb 5, 2002Kabushiki Kaisha ToshibaPlasma processing method and plasma processing apparatusUS6364949Oct 19, 1999Apr 2, 2002Applied Materials, Inc.300 mm CVD chamber design for metal-organic thin film depositionUS6371712Oct 20, 2000Apr 16, 2002Applied Komatsu Technology, Inc.Support frame for substratesUS6383573May 17, 2000May 7, 2002Unaxis Balzers AktiengesellschaftProcess for manufacturing coated plastic bodyUS6428850Jul 10, 2000Aug 6, 2002Tokyo Electron LimitedSingle-substrate-processing CVD method of forming film containing metal elementUS6444040 *May 5, 2000Sep 3, 2002Applied Materials Inc.Gas distribution plateUS6447980Jul 19, 2000Sep 10, 2002Clariant Finance (Bvi) LimitedPhotoresist composition for deep UV and process thereofUS6454855Dec 13, 1999Sep 24, 2002Unaxis Trading AgMethod for producing coated workpieces, uses and installation for the methodUS6454860Oct 27, 1998Sep 24, 2002Applied Materials, Inc.Deposition reactor having vaporizing, mixing and cleaning capabilitiesUS6477980Jan 20, 2000Nov 12, 2002Applied Materials, Inc.Flexibly suspended gas distribution manifold for plasma chamberUS6502530Apr 26, 2000Jan 7, 2003Unaxis Balzers AktiengesellschaftDesign of gas injection for the electrode in a capacitively coupled RF plasma reactorUS6527908Mar 21, 2001Mar 4, 2003Sharp Kabushiki KaishaPlasma process apparatusUS6548112Nov 18, 1999Apr 15, 2003Tokyo Electron LimitedApparatus and method for delivery of precursor vapor from low vapor pressure liquid sources to a CVD chamberUS6548122Nov 19, 1999Apr 15, 2003Sri InternationalMethod of producing and depositing a metal filmUS6556536Apr 26, 1999Apr 29, 2003Unaxis Nimbus LimitedVacuum apparatusUS6565661Jun 4, 1999May 20, 2003Simplus Systems CorporationHigh flow conductance and high thermal conductance showerhead system and methodUS6566186May 17, 2000May 20, 2003Lsi Logic CorporationCapacitor with stoichiometrically adjusted dielectric and method of fabricating sameUS6593548Sep 7, 2001Jul 15, 2003Japan As Represented By President Of Japan Advanced Institute Of Science And TechnologyHeating element CVD systemUS6596576Dec 21, 2001Jul 22, 2003Applied Materials, Inc.Limiting hydrogen ion diffusion using multiple layers of SiO2 and Si3N4US6599367 *Mar 5, 1999Jul 29, 2003Tokyo Electron LimitedVacuum processing apparatusUS6616766Dec 30, 2002Sep 9, 2003Genus, Inc.Method and apparatus for providing uniform gas delivery to substrates in CVD and PECVD processesUS6619131Mar 14, 2002Sep 16, 2003Unaxis Balzers AgCombination pressure sensor with capacitive and thermal elementsUS6626988May 9, 2000Sep 30, 2003Bayer AktiengesellschaftPhosphate-stabilized polyurethane materials, cross-linked by condensation, method for their production and use thereofUS6626998Nov 8, 2000Sep 30, 2003Genus, Inc.Plasma generator assembly for use in CVD and PECVD processesUS6631692Mar 17, 2000Oct 14, 2003Asm Japan K.K.Plasma CVD film-forming deviceUS6663025Mar 29, 2001Dec 16, 2003Lam Research CorporationDiffuser and rapid cycle chamberUS6664202Apr 18, 2002Dec 16, 2003Applied Materials Inc.Mixed frequency high temperature nitride CVD processUS6682630Sep 18, 2000Jan 27, 2004European Community (Ec)Uniform gas distribution in large area plasma sourceUS6683216Nov 6, 2002Jan 27, 2004Eastman Chemical CompanyContinuous process for the preparation of aminesUS6740367Dec 23, 2002May 25, 2004Asm Japan K.K.Plasma CVD film-forming deviceUS6756324Mar 25, 1997Jun 29, 2004International Business Machines CorporationLow temperature processes for making electronic device structuresUS6772827Aug 3, 2001Aug 10, 2004Applied Materials, Inc.Suspended gas distribution manifold for plasma chamberUS6793733Jan 25, 2002Sep 21, 2004Applied Materials Inc.Gas distribution showerheadUS6814838Mar 29, 2001Nov 9, 2004Unaxis Balzers AktiengesellschaftVacuum treatment chamber and method for treating surfacesUS6821347 *Jul 8, 2002Nov 23, 2004Micron Technology, Inc.Apparatus and method for depositing materials onto microelectronic workpiecesUS6852168May 3, 2001Feb 8, 2005Ips Ltd.Reactor for depositing thin film on waferUS6860965Jun 21, 2001Mar 1, 2005Novellus Systems, Inc.High throughput architecture for semiconductor processingUS6873764Jan 26, 2001Mar 29, 2005Unaxis Balzers AktiengesellschaftMethod for producing a grid structure, an optical element, an evanescence field sensor plate, microtitre plate and an optical communication engineering coupler as well as a device for monitoring a wavelengthUS6881684Aug 29, 2003Apr 19, 2005Canon Kabushiki KaishaMethod of forming silicon nitride deposited filmUS6916407Nov 6, 2001Jul 12, 2005Unaxis Trading AgTarget comprising thickness profiling for an RF magnetronUS6918352Jul 22, 2002Jul 19, 2005Unaxis Trading AgMethod for producing coated workpieces, uses and installation for the methodUS6924241Feb 24, 2003Aug 2, 2005Promos Technologies, Inc.Method of making a silicon nitride film that is transmissive to ultraviolet lightUS6942753Apr 16, 2003Sep 13, 2005Applied Materials, Inc.Gas distribution plate assembly for large area plasma enhanced chemical vapor depositionUS6961490Jul 27, 2001Nov 1, 2005Unaxis-Balzers AktiengesellschaftWaveguide plate and process for its production and microtitre plateUS7125758Apr 20, 2004Oct 24, 2006Applied Materials, Inc.Controlling the properties and uniformity of a silicon nitride film by controlling the film forming precursorsUS7270713 *Jan 7, 2003Sep 18, 2007Applied Materials, Inc.Tunable gas distribution plate assemblyUS7534301 *Sep 21, 2004May 19, 2009Applied Materials, Inc.RF grounding of cathode in process chamberUS20010021422Jan 10, 2001Sep 13, 2001Mitsubishi Heavy Industries, Ltd.Discharge plasma generating method, discharge plasma generating apparatus, semiconductor device fabrication method, and semiconductor device fabrication apparatusUS20010023742Apr 3, 2001Sep 27, 2001Unaxis Balzers Aktiengesellschaft, Fl-9496 Balzers, Furstentum LiechtensteinPlasma reactor for the treatment of large size substratesUS20010029892Jan 12, 1999Oct 18, 2001Robert C. CookVertical plasma enhanced process apparatus & methodUS20020006478Mar 27, 2001Jan 17, 2002Katsuhisa YudaMethod of forming silicon oxide film and forming apparatus thereofUS20020011215Dec 11, 1998Jan 31, 2002Goushu TeiPlasma treatment apparatus and method of manufacturing optical parts using the sameUS20020129769Mar 19, 2002Sep 19, 2002Apex Co. Ltd.Chemical vapor deposition apparatusUS20020134309May 20, 2002Sep 26, 2002An-Chun TuGas delivering deviceUS20020146879Dec 21, 2001Oct 10, 2002Applied Materials, Inc.Limiting Hydrogen ion diffusion using multiple layers of SiO2 and Si3N4US20020174950May 3, 2002Nov 28, 2002Sang-Gee ParkApparatus for manufacturing a semiconductor deviceUS20020189545Sep 7, 2001Dec 19, 2002Hideki MatsumuraHeating element cvd systemUS20030089314Dec 23, 2002May 15, 2003Nobuo MatsukiPlasma CVD film-forming deviceUS20030143410Feb 6, 2003Jul 31, 2003Applied Materials, Inc.Method for reduction of contaminants in amorphous-silicon filmUS20030170388Jun 25, 2001Sep 11, 2003Hiroshi ShinrikiMethod for forming thin film and appatus for forming thin filmUS20030199175Apr 18, 2002Oct 23, 2003Applied Materials, Inc.Mixed frequency high temperature nitride cvd processUS20030207033May 6, 2002Nov 6, 2003Applied Materials, Inc.Method and apparatus for deposition of low dielectric constant materialsUS20030209323May 2, 2003Nov 13, 2003Nec Electronics CorporationProduction apparatus for manufacturing semiconductor deviceUS20040003777Jul 8, 2002Jan 8, 2004Carpenter Craig M.Apparatus and method for depositing materials onto microelectronic workpiecesUS20040043637Aug 29, 2003Mar 4, 2004Yukito AotaMethod of forming silicon nitride deposited filmUS20040055537Jun 20, 2003Mar 25, 2004Shinichi KuritaTransfer chamber for vacuum processing systemUS20040064407Nov 24, 2003Apr 1, 2004Kight Peter J.Integrated electronic bill presentment and universal paymentUS20040129211Jan 7, 2003Jul 8, 2004Applied Materials, Inc.Tunable gas distribution plate assemblyUS20040145383Nov 18, 2003Jul 29, 2004Matthias BrunnerApparatus and method for contacting of test objectsUS20040228141Feb 27, 2004Nov 18, 2004General Electric CompanyDiffuser for flat panel displayUS20040250955Jun 12, 2003Dec 16, 2004Applied Materials, Inc.RF current return path for a large area substrate plasma reactorUS20050000430May 24, 2004Jan 6, 2005Jang Geun-HaShowerhead assembly and apparatus for manufacturing semiconductor device having the sameUS20050066898Sep 8, 2004Mar 31, 2005Unaxis Balzers Ltd.Voltage non-uniformity compensation method for high frequency plasma reactor for the treatment of rectangular large area substratesUS20050133160Dec 23, 2003Jun 23, 2005Kennedy William S.Showerhead electrode assembly for plasma processing apparatusesUS20050133161 *Sep 2, 2004Jun 23, 2005Carpenter Craig M.Apparatus and method for depositing materials onto microelectronic workpiecesUS20050183827Feb 23, 2005Aug 25, 2005Applied Materials, Inc.Showerhead mounting to accommodate thermal expansionUS20050196254Mar 8, 2005Sep 8, 2005Jusung Engineering Co., Ltd.Vacuum pumping system, driving method thereof, apparatus having the same, and method of transferring substrate using the sameUS20050199182 *Jul 3, 2003Sep 15, 2005Ulvac, Inc.Apparatus for the preparation of filmUS20050223986 *Apr 12, 2004Oct 13, 2005Choi Soo YGas diffusion shower head design for large area plasma enhanced chemical vapor depositionUS20050251990 *Jul 12, 2004Nov 17, 2005Applied Materials, Inc.Plasma uniformity control by gas diffuser hole designUS20050255257 *Dec 22, 2004Nov 17, 2005Choi Soo YMethod of controlling the film properties of PECVD-deposited thin filmsUS20060005771Jun 2, 2005Jan 12, 2006Applied Materials, Inc.Apparatus and method of shaping profiles of large-area PECVD electrodesUS20060005926Jul 8, 2005Jan 12, 2006Jusung Engineering Co., Ltd.Gas distributor and apparatus using the sameUS20060054280Feb 23, 2005Mar 16, 2006Jang Geun-HaApparatus of manufacturing display substrate and showerhead assembly equipped thereinUS20060060138Jul 25, 2005Mar 23, 2006Applied Materials, Inc.Diffuser gravity supportUS20060130764Dec 16, 2005Jun 22, 2006Jusung Engineering Co., Ltd.Susceptor for apparatus fabricating thin filmUS20060228496 *Jul 1, 2005Oct 12, 2006Applied Materials, Inc.Plasma uniformity control by gas diffuser curvatureUS20060236934 *Jun 22, 2006Oct 26, 2006Choi Soo YPlasma uniformity control by gas diffuser hole designUS20080020146Jul 20, 2007Jan 24, 2008Choi Soo YDiffuser plate with slit valve compensationUS20080305246 *Jun 7, 2007Dec 11, 2008Applied Materials, Inc.Apparatus for depositing a uniform silicon film and methods for manufacturing the sameUS20100006031 *Jul 5, 2009Jan 14, 2010Jusung Engineering Co., Ltd.Gas distribution plate and substrate treating apparatus including the sameCN1501762ANov 14, 2002Jun 2, 2004友达光电股份有限公司Plasma processing apparatusCN1696768ADec 31, 2004Nov 16, 2005应用材料股份有限公司Plasma uniformity control by gas diffuser hole designEP0843348B1Nov 12, 1997Aug 19, 2009Applied Materials, Inc.Method and apparatus for processing a semiconductor substrateEP0985742B1Sep 9, 1999May 12, 2004Saint-Gobain Industrial Ceramics, Inc.Plasma jet chemical vapor deposition system having a plurality of distribution headsEP1118693B1Jan 17, 2001Jan 3, 2007Applied Materials, Inc.Suspended gas distribution manifold for plasma chamberEP1167570A1Jun 5, 2001Jan 2, 2002IPS LimitedReactor for depositing thin filmEP1168427A1Jun 1, 2001Jan 2, 2002Applied Materials, Inc.Method of plasma depositing silicon nitrideEP1286386A1Aug 5, 1996Feb 26, 2003Seiko Epson CorporationThin film transistor fabrication methodEP1321538A3Dec 18, 2002Jan 2, 2004General Electric CompanyGas distributor for vapor coating method and apparatusEP1386981A1Jul 1, 2003Feb 4, 2004Ulvac, Inc.A thin film-forming apparatusEP1693880A2Oct 7, 2005Aug 23, 2006Applied Materials, Inc.Diffuser gravity supportJP2000235954A Title not availableJP2002053965A Title not availableJP2002064084A Title not availableJP2002299240A Title not availableKR20010077810A Title not availableKR20050087454A Title not availableKR20070039931A Title not availableTW239225B Title not availableTW252223B Title not availableTW279997B Title not availableTW301465U Title not availableTWI276701B Title not availableWO2003002860A2 *Jun 20, 2002Jan 9, 2003Tokyo Electron LimitedDirected gas injection apparatus for semiconductor processingWO2003015481A2Aug 2, 2002Feb 20, 2003Applied Materials, Inc.Suspended gas distribution manifold for plasma chamberWO2006017136A2 *Jul 7, 2005Feb 16, 2006Applied Materials, Inc.Plasma uniformity control by gas diffuser curvature* Cited by examinerNon-Patent CitationsReference1"13.56 MHz Hollow Cathode Plasma Source HCD-P 100" Plasma Consult Germany-Technical Note.2"13.56 MHz Hollow Cathode Plasma Source HCD-P 100" Plasma Consult Germany—Technical Note.3"13.56 MHz Hollow Cathode Plasma Source HCD-P 300" Plasma Consult Germany-Technical Note.4"13.56 MHz Hollow Cathode Plasma Source HCD-P 300" Plasma Consult Germany—Technical Note.5Anders, et al. "Characterization of a low-energy constricted-plasma source" Ernest Orlando Lawrence Berkeley National Laboratory & Institute of Physics, Germany Aug. 1997-pp. 1-11.6Anders, et al. "Characterization of a low-energy constricted-plasma source" Ernest Orlando Lawrence Berkeley National Laboratory & Institute of Physics, Germany Aug. 1997—pp. 1-11.7Anders, et al. "Working Principle of the Hollow-Anode Plasma Source" Lawrence Berkeley National Laboratory, USB pp. 1-10.8Chinese Office Action dated Jul. 27, 2007 for Chinese Application No. 200510106396.9.9Chinese Office Action dated Jun. 15, 2007 for Chinese Application No. 200410082199.3.10Chinese Office Action dated Jun. 6, 2008 for Chinese Application No. 200510106396.9.11Chinese office action dated Nov. 3, 2010 for Chinese Patent Application No. 200710166935.7.12Decision of Patent Examination and Allowance dated Nov. 30, 2007 for Korean Application No. 10-2005-87454.13European Office Action dated Dec. 20, 2007 for European Patent Application No. 05000831.7.14European Office Action dated Feb. 23, 2007 for European Application No. 05000831.7-1215.15European Office Action dated Jun. 12, 2008 for EP Application No. 05764564.0.16European Search Report for Application No. 05000831.7-2122; dated Feb. 16, 2006.17Examiner's Grounds for Rejection dated May 25, 2007 for Korean Application No. 10-2005-87454.18Examiner's Grounds for Rejection dated Sep. 9, 2008 for Korean Application No. 10-2007-0079040.19Extended European Search Report dated Aug. 30, 2006 for European Application No. 05021902.1.20Final office action for U.S. Appl. No. 11/473,661 dated Mar. 23, 2010.21International Preliminary Report on Patentability dated Jan. 25, 2007 for International Application No. PCT/US2005/24165.22International Search Report and Written Opinion dated Jul. 19, 2006 for International Application No. PCT/US2005/24165.23International Search Report mailed Aug. 11, 2005 for International Application No. PCT/US05/12832.24Japanese Notice of Reasons for Rejection dated Jul. 8, 2008 for Japanese Application No. 2004-353175.25Kim et al. "A Novel Self-Aligned Coplanar Amorphous Silicon Thin Film Transistor," ISSN0098-0966X/98/2901 (1998).26Korean Notice of Preliminary Rejection dated May 7, 2007 for Korean Application No. 10-2004-0108843.27Korean Office Action dated Aug. 29, 2006 for Korean Application No. 10-2004-0108843.28Korean office action dated Dec. 10, 2010 for Korean patent application No. 10-2008-0053726.29Korean Office Action dated Nov. 22, 2007 for Korean Patent Application No. 10-2007-0079040.30Korean Office Action dated Oct. 31, 2006 for Korean Application No. 10-2005-87454.31Korean Office Action for Patent Application No. 10-2004-0108843, dated Aug. 29, 2006.32Kuo "Plasma Enhanced Chemical Vapor Deposited Silicon Nitride as a Gate Dielectric Film for Amorphous Silicon Thin Film Transistors-A Critical Review," Vacuum, vol. 51, No. 4, pp. 741-745, Elsevier Science, Ltd., Pergamon Press, Great Britain, Dec. 1998.33Kuo "Plasma Enhanced Chemical Vapor Deposited Silicon Nitride as a Gate Dielectric Film for Amorphous Silicon Thin Film Transistors—A Critical Review," Vacuum, vol. 51, No. 4, pp. 741-745, Elsevier Science, Ltd., Pergamon Press, Great Britain, Dec. 1998.34Kyung-ha "A Study on Laser Annealed Polycrystalline Silicon Thin Film Transistors (TFTs) with SiNx Gate Insulator," Kyung Hee University, Ch. 2 & 4 (1998).35L. Bardos et al., "Thin Film Processing by Radio Frequency Hollow Cathodes", Surface and Coatings Technology 97, (1997), pp. 723-728.36Lee, et al. "High-Density Hollow Cathode Plasma Etching for Field Emission Display Applications" Journal of Information Display, vol. 2, No. 4, 2001 pp. 1-7.37Lieberman et al. "Standing wave and skin effects in large-area, high-frequency capacitive discharges," Plasma Sources Sci. Technolo., vol. 11, pp. 283-293 (2002).38Non-final office action for U.S. Appl. No. 11/473,661 dated Jul. 22, 2009.39Notice of Office Action dated Jun. 15, 2007 for Chinese Application No. 200410082199.3.40Notice of Preliminary Rejection dated May 7, 2007 for Korean Application No. 10-2004-0108843.41Notice of Reasons for Rejection dated Feb. 17, 2009 for Japanese Patent Application No. 2005-272673.42Notice of Reasons for Rejection for Japanese Patent Application No. P2004-353175 dated Jun. 11, 2009.43Notice to File a Response dated Aug. 29, 2006 for Korean Application No. 10-2004-0108843.44Notice to File a Response for Korean Patent Application No. 10-2008-0053726 dated May 18, 2010.45Office Action dated Dec. 19, 2008 for Chinese Patent Application No. 200580022984.2.46Office Action dated Feb. 24, 2009 for European Patent Application No. 05000831.7-1215.47Office action for Chinese Patent Application No. 2007101669357 dated Feb. 5, 2010.48Office Action for Chinese Patent Application No. 200810099760.7 dated Feb. 5, 2010.49Office action for European Patent Application No. 05000831.7-1215 dated Mar. 17, 2010.50Official Letter dated Jan. 27, 2005 for Taiwan Application No. 93136349.51Park "Bulk and Interface properties of low-temperature silicon nitride films deposited by remote plasma enhanced chemical vapor deposition," Journal of Materials Science: Materials in Electronics, vol. 12, pp. 515-522 (2001).52Partial European Search Report dated May 23, 2006 for European Application No. 05021902.1.53Partial Search Report dated Mar. 15, 2006 for International Application No. PCT/US2005/024165.54Sazonov et al. "Low Temperature a-Si:H TFT on Plastic Films: Materials and Fabrication Aspects," Proc. 23rd International Conference on Microelectronics (MIEL 2002), vol. 2, Nis, Yugosolvia (May 12-15, 2002).55Taiwan Office Action for application No. 097121591 dated Mar. 24, 2011.56Taiwan Search Report dated Apr. 5, 2007 for Taiwanese Patent Application No. TW 94130602.57Third Party Submission for Korean Application No. 10-2004-0108843, Nov. 2006.58Thomasson et al. "High Mobility Tri-Layer a-Si:H Thin Film Transistors with Ultra-Thin Active Layer," IEEE Electron Device Letters, vol. 18, No. 8, Aug. 1997, pp. 397-399.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8409459 *Feb 28, 2008Apr 2, 2013Tokyo Electron LimitedHollow cathode device and method for using the device to control the uniformity of a plasma processUS8586487Jan 18, 2012Nov 19, 2013Applied Materials, Inc.Low temperature plasma enhanced chemical vapor deposition of conformal silicon carbon nitride and silicon nitride filmsUS8679982Apr 18, 2012Mar 25, 2014Applied Materials, Inc.Selective suppression of dry-etch rate of materials containing both silicon and oxygenUS8679983Apr 18, 2012Mar 25, 2014Applied Materials, Inc.Selective suppression of dry-etch rate of materials containing both silicon and nitrogenUS8741778Aug 3, 2011Jun 3, 2014Applied Materials, Inc.Uniform dry etch in two stagesUS8747556 *Sep 14, 2012Jun 10, 2014Applied Materials, Inc.Apparatuses and methods for atomic layer depositionUS8765574Mar 15, 2013Jul 1, 2014Applied Materials, Inc.Dry etch processUS8771536Oct 24, 2011Jul 8, 2014Applied Materials, Inc.Dry-etch for silicon-and-carbon-containing filmsUS8771539Sep 14, 2011Jul 8, 2014Applied Materials, Inc.Remotely-excited fluorine and water vapor etchUS8801952Jun 3, 2013Aug 12, 2014Applied Materials, Inc.Conformal oxide dry etchUS8808563Apr 4, 2012Aug 19, 2014Applied Materials, Inc.Selective etch of silicon by way of metastable hydrogen terminationUS8895449Aug 14, 2013Nov 25, 2014Applied Materials, Inc.Delicate dry cleanUS8921234Mar 8, 2013Dec 30, 2014Applied Materials, Inc.Selective titanium nitride etchingUS8927390Sep 21, 2012Jan 6, 2015Applied Materials, Inc.Intrench profileUS8951429Dec 20, 2013Feb 10, 2015Applied Materials, Inc.Tungsten oxide processingUS8956980Nov 25, 2013Feb 17, 2015Applied Materials, Inc.Selective etch of silicon nitrideUS8969212Mar 15, 2013Mar 3, 2015Applied Materials, Inc.Dry-etch selectivityUS8975152Nov 5, 2012Mar 10, 2015Applied Materials, Inc.Methods of reducing substrate dislocation during gapfill processingUS8980763Mar 15, 2013Mar 17, 2015Applied Materials, Inc.Dry-etch for selective tungsten removalUS8999856Mar 9, 2012Apr 7, 2015Applied Materials, Inc.Methods for etch of sin filmsUS9012302Sep 11, 2014Apr 21, 2015Applied Materials, Inc.Intrench profileUS9023732Apr 7, 2014May 5, 2015Applied Materials, Inc.Processing systems and methods for halide scavengingUS9023734Mar 15, 2013May 5, 2015Applied Materials, Inc.Radical-component oxide etchUS9034770Mar 15, 2013May 19, 2015Applied Materials, Inc.Differential silicon oxide etchUS9040422Jun 3, 2013May 26, 2015Applied Materials, Inc.Selective titanium nitride removalUS9064815Mar 9, 2012Jun 23, 2015Applied Materials, Inc.Methods for etch of metal and metal-oxide filmsUS9064816Mar 15, 2013Jun 23, 2015Applied Materials, Inc.Dry-etch for selective oxidation removalUS9093371Apr 7, 2014Jul 28, 2015Applied Materials, Inc.Processing systems and methods for halide scavengingUS9093390Jun 25, 2014Jul 28, 2015Applied Materials, Inc.Conformal oxide dry etchUS9111877Mar 8, 2013Aug 18, 2015Applied Materials, Inc.Non-local plasma oxide etchUS9114438Aug 21, 2013Aug 25, 2015Applied Materials, Inc.Copper residue chamber cleanUS9117855Mar 31, 2014Aug 25, 2015Applied Materials, Inc.Polarity control for remote plasmaUS9132436Mar 13, 2013Sep 15, 2015Applied Materials, Inc.Chemical control features in wafer process equipmentUS9136273Mar 21, 2014Sep 15, 2015Applied Materials, Inc.Flash gate air gapUS9153442Apr 8, 2014Oct 6, 2015Applied Materials, Inc.Processing systems and methods for halide scavengingUS9159606Jul 31, 2014Oct 13, 2015Applied Materials, Inc.Metal air gapUS9165786Aug 5, 2014Oct 20, 2015Applied Materials, Inc.Integrated oxide and nitride recess for better channel contact in 3D architecturesUS9184055Apr 7, 2014Nov 10, 2015Applied Materials, Inc.Processing systems and methods for halide scavengingUS9190293Mar 17, 2014Nov 17, 2015Applied Materials, Inc.Even tungsten etch for high aspect ratio trenchesUS9200368Aug 10, 2011Dec 1, 2015Applied Materials, Inc.Plasma uniformity control by gas diffuser hole designUS9209012Sep 8, 2014Dec 8, 2015Applied Materials, Inc.Selective etch of silicon nitrideUS9236265May 5, 2014Jan 12, 2016Applied Materials, Inc.Silicon germanium processingUS9236266May 27, 2014Jan 12, 2016Applied Materials, Inc.Dry-etch for silicon-and-carbon-containing filmsUS9245762May 12, 2014Jan 26, 2016Applied Materials, Inc.Procedure for etch rate consistencyUS9255326Mar 12, 2013Feb 9, 2016Novellus Systems, Inc.Systems and methods for remote plasma atomic layer depositionUS9263278Mar 31, 2014Feb 16, 2016Applied Materials, Inc.Dopant etch selectivity controlUS9269590Apr 7, 2014Feb 23, 2016Applied Materials, Inc.Spacer formationUS9287095Dec 17, 2013Mar 15, 2016Applied Materials, Inc.Semiconductor system assemblies and methods of operationUS9287134Jan 17, 2014Mar 15, 2016Applied Materials, Inc.Titanium oxide etchUS9293568Jan 27, 2014Mar 22, 2016Applied Materials, Inc.Method of fin patterningUS9299537Mar 20, 2014Mar 29, 2016Applied Materials, Inc.Radial waveguide systems and methods for post-match control of microwavesUS9299538Mar 20, 2014Mar 29, 2016Applied Materials, Inc.Radial waveguide systems and methods for post-match control of microwavesUS9299575Mar 17, 2014Mar 29, 2016Applied Materials, Inc.Gas-phase tungsten etchUS9299582Oct 13, 2014Mar 29, 2016Applied Materials, Inc.Selective etch for metal-containing materialsUS9299583Dec 5, 2014Mar 29, 2016Applied Materials, Inc.Aluminum oxide selective etchUS9309598May 28, 2014Apr 12, 2016Applied Materials, Inc.Oxide and metal removalUS9324576Apr 18, 2011Apr 26, 2016Applied Materials, Inc.Selective etch for silicon filmsUS9343272Jan 8, 2015May 17, 2016Applied Materials, Inc.Self-aligned processUS9349605Aug 7, 2015May 24, 2016Applied Materials, Inc.Oxide etch selectivity systems and methodsUS9355856Sep 12, 2014May 31, 2016Applied Materials, Inc.V trench dry etchUS9355862Nov 17, 2014May 31, 2016Applied Materials, Inc.Fluorine-based hardmask removalUS9355863Aug 17, 2015May 31, 2016Applied Materials, Inc.Non-local plasma oxide etchUS9362130Feb 21, 2014Jun 7, 2016Applied Materials, Inc.Enhanced etching processes using remote plasma sourcesUS9368364Dec 10, 2014Jun 14, 2016Applied Materials, Inc.Silicon etch process with tunable selectivity to SiO2 and other materialsUS9373517Mar 14, 2013Jun 21, 2016Applied Materials, Inc.Semiconductor processing with DC assisted RF power for improved controlUS9373522Jan 22, 2015Jun 21, 2016Applied Mateials, Inc.Titanium nitride removalUS9378969Jun 19, 2014Jun 28, 2016Applied Materials, Inc.Low temperature gas-phase carbon removalUS9378978Jul 31, 2014Jun 28, 2016Applied Materials, Inc.Integrated oxide recess and floating gate fin trimmingUS9384997Jan 22, 2015Jul 5, 2016Applied Materials, Inc.Dry-etch selectivityUS9385028Feb 3, 2014Jul 5, 2016Applied Materials, Inc.Air gap processUS9390937Mar 15, 2013Jul 12, 2016Applied Materials, Inc.Silicon-carbon-nitride selective etchUS9396989Jan 27, 2014Jul 19, 2016Applied Materials, Inc.Air gaps between copper linesUS9406523Jun 19, 2014Aug 2, 2016Applied Materials, Inc.Highly selective doped oxide removal methodUS9412608Feb 9, 2015Aug 9, 2016Applied Materials, Inc.Dry-etch for selective tungsten removalUS9416451Oct 6, 2011Aug 16, 2016Eugene Technology Co., Ltd.Substrate processing device equipped with semicircle shaped antennaUS9418858Jun 25, 2014Aug 16, 2016Applied Materials, Inc.Selective etch of silicon by way of metastable hydrogen terminationUS9425058Jul 24, 2014Aug 23, 2016Applied Materials, Inc.Simplified litho-etch-litho-etch processUS9437451May 4, 2015Sep 6, 2016Applied Materials, Inc.Radical-component oxide etchUS9447499 *Jun 22, 2012Sep 20, 2016Novellus Systems, Inc.Dual plenum, axi-symmetric showerhead with edge-to-center gas deliveryUS9449845Dec 29, 2014Sep 20, 2016Applied Materials, Inc.Selective titanium nitride etchingUS9449846Jan 28, 2015Sep 20, 2016Applied Materials, Inc.Vertical gate separationUS9449850May 4, 2015Sep 20, 2016Applied Materials, Inc.Processing systems and methods for halide scavengingUS9472412Dec 3, 2015Oct 18, 2016Applied Materials, Inc.Procedure for etch rate consistencyUS9472417Oct 14, 2014Oct 18, 2016Applied Materials, Inc.Plasma-free metal etchUS9478432Nov 14, 2014Oct 25, 2016Applied Materials, Inc.Silicon oxide selective removalUS9478434Nov 17, 2014Oct 25, 2016Applied Materials, Inc.Chlorine-based hardmask removalUS20090159001 *Aug 9, 2005Jun 25, 2009Pyung-Yong UmShower head of chemical vapor deposition apparatusUS20090218212 *Feb 28, 2008Sep 3, 2009Tokyo Electron LimitedHollow cathode device and method for using the device to control the uniformity of a plasma processUS20130341433 *Jun 22, 2012Dec 26, 2013Shambhu N. RoyDual plenum, axi-symmetric showerhead with edge-to-center gas deliveryUS20140202388 *Mar 20, 2014Jul 24, 2014Eugene Technology Co., Ltd.Shower head unit and chemical vapor deposition apparatusUS20150214009 *Jan 25, 2014Jul 30, 2015Yuri GlukhoyShowerhead-cooler system of a semiconductor-processing chamber for semiconductor wafers of large area* Cited by examinerClassifications U.S. Classification118/715, 156/345.33, 156/345.34, 156/345.47, 118/723.00E, 156/345.43International ClassificationC23C16/34, C23C16/505, H01L21/205, H01L21/3065, C23C16/509, H01L21/02, C23C16/00, C23C16/44, C23F1/00, C23C16/455, H01J37/32Cooperative ClassificationH01J2237/3325, H01J2237/3323, H01J2237/3321, H01J2237/327, H01J37/32596, H01J37/32541, H01J37/3244, H01J37/32091, C23C16/45565, C23C16/5096, H01J37/32082, C23C16/345, C23C16/455, Y10T29/49885, Y10T29/49996European ClassificationC23C16/455, C23C16/455K2, C23C16/34C, C23C16/509D, H01J37/32O2, H01J37/32M8Legal EventsDateCodeEventDescriptionJan 18, 2005ASAssignmentOwner name: APPLIED MATERIALS, INC., CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHOI, SOO YOUNG;WHITE, JOHN M.;WANG, QUNHUA;AND OTHERS;REEL/FRAME:015604/0451;SIGNING DATES FROM 20040801 TO 20040921Owner name: APPLIED MATERIALS, INC., CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHOI, SOO YOUNG;WHITE, JOHN M.;WANG, QUNHUA;AND OTHERS;SIGNING DATES FROM 20040801 TO 20040921;REEL/FRAME:015604/0451Mar 27, 2012CCCertificate of correctionMay 26, 2015FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services