Source: http://www.google.com/patents/US20030140941?dq=7181427
Timestamp: 2017-09-22 21:37:03
Document Index: 486434465

Matched Legal Cases: ['art 35', 'art 35', 'art 7', 'art 7', 'art 7', 'art 7', 'art 7', 'art 7', 'art 7']

Patent US20030140941 - CVD apparatus - Google Patents
An improved CVD apparatus for depositing a uniform film is shown. The apparatus comprises a reaction chamber, a substrate holder and a plurality of light sources for photo CVD or a pair of electrodes for plasma CVD. The substrate holder is a cylindrical cart which is encircled by the light sources, and...http://www.google.com/patents/US20030140941?utm_source=gb-gplus-sharePatent US20030140941 - CVD apparatus
Publication number US20030140941 A1
Application number US 10/339,631
Also published as CN1020290C, CN87106283A, DE3782991D1, DE3782991T2, EP0260097A1, EP0260097B1, EP0490883A1, US4950624, US6013338, US6520189
Publication number 10339631, 339631, US 2003/0140941 A1, US 2003/140941 A1, US 20030140941 A1, US 20030140941A1, US 2003140941 A1, US 2003140941A1, US-A1-20030140941, US-A1-2003140941, US2003/0140941A1, US2003/140941A1, US20030140941 A1, US20030140941A1, US2003140941 A1, US2003140941A1
Inventors Takashi Inushima, Shigenori Hayashi, Toru Takayama, Masakazu Odaka, Naoki Hirose
Patent Citations (58), Referenced by (10), Classifications (47)
US 20030140941 A1
forming a layer comprising silicon oxide over a substrate by plasma CVD using a reactive gas comprising tetra-ethyl-oxy-silane (Si(OC2H5)4) and an oxide gas;
cleaning an inside of a reaction chamber in which said layer has been formed.
This Application is a COntinuation-in-Part of copending application Ser. No. 07/497,794; which in turn is a Continuation of application Ser. No. 07/091,770, now abandoned.
Hg+hv->Hg* (“*” is a symbol for excitation)
Hg*+SiH4->SiH3+H—+Hg (“—” is a symbol for radical)
Hg*+NH3->NH2—+H—+Hg
yNH2 —+xSiH3->SixNy +zH2
In the above equations, x, y and z are chosen appropriately.
[0006]FIG. 1 is a cross-section view showing a photo CVD apparatus which has been devised by the inventors in advance of the present invention. To facilitate the understanding of the background of the present invention, this apparatus will be briefly explained. In the figure, the apparatus comprises a reaction chamber 31, light source chambers 39 and ultraviolet light sources 41. Between the light source chambers 39, a cart 35 is mounted so as to be capable of moving in the direction perpendicular to the drawing sheet. The cart is provided with heaters 37 to heat substrates mounted on the external surfaces of the cart 35 facing to the light source chambers 39. The temperature of the substrates 33 is elevated to about 200° C. which is suitable for forming a silicon nitride film. In the reaction chamber 31 is circulated a process gas at a pressure of several Torrs. The process gas is irradiated through quartz windows 47 with light radiated from the light source 41. A numeral 45 designates electrodes by virtue of which discharge takes place with the cart as the other electrode and undesired product deposited on the surface of the quartz windows 47 can be eliminated by sputtering.
[0013]FIG. 1 is a cross-section view of an example of a photo CVD apparatus.
[0014]FIG. 2 is a cross-section view showing an embodiment of the invention.
[0015]FIG. 3 is a cross-section view taken along a III-III line of FIG. 2.
[0016]FIG. 4 is a cross-section view showing another embodiment of the invention.
Referring to FIG. 2 and FIG. 3, a photo enhanced CVD apparatus in accordance with the invention is illustrated. In the figure, the apparatus 1 comprises a reaction chamber 3, a hexagonal cart as a substrate holder having six lateral faces on which substrates 15 are mounted, a driving device 9 with a motor 21 for rotating the cart 7 around its axis, a plurality of quartz tubes 17, which may be alternatingly provided of different diameters, on the inside of the reaction chamber 3, with one end of each tube at a constant angular distance around the cart 7 and with the other end of each tube being closed, mercury lamps 19 provided in and housed air-tightly by the quartz tube respectively, halogen lamp heaters 23 arranged along the axial direction, a process gas introduction system 11, and an exhaustion system 13. A cooling gas, such as nitrogen gas., is circulated in the quartz tubes 17 by means of recirculation means 29. On each face of the cart 7, two substrates each 35 cm long and 30 cm wide can be mounted, and therefore the cart 7 can hold twelve substrates thereon. The cart is preferentially removable from the driving device so that substrates can be mounted outside the reaction chamber 3.
Next, the process in the apparatus will be explained. First, twelve substrates are mounted on the cart 7 and entered into the reaction chamber 3. After evacuating the reaction chamber 3 to 10−2-10−6 Torr by means of the exhaustion system 13, a process gas is inputted from the introduction system 11 at about 3 Torr. Simultaneously, the substrates 15 are heated by the heater 23 to about 200° C. Then, the cart 7 encircled by the mercury lamps 19 is rotated at 2 rpm by the driving device 9 and irradiated with ultraviolet light from the lamps 19, whereupon the product of a reaction initiated by optical energy is deposited on the substrates 15. The product undesirably deposited on the quartz tubes 17 can be removed by sputtering in virtue of discharge between the cart 7 and the reaction chamber 3. Photo enhanced CVD process is carried out, e.g., in accordance with the following equation:
3Si2H6+8NH3 ->2Si3N4+21H2 or
SiH4+4N2O->SiO2+4N2+2H2O (1)
SiO4(C2H5)4+1402->SiO2+8CO2+10H2O, or
SiO4(C2H5)4+28N2O->SiO2+8CO2+10H2O+28N2 (2)
Si3N4+4NF3->3SiF4+4N2
3SiO2+4NF3->3SiF4+2N2+3O3
To investigate the relationship between the uniformity of the illumination intensity on the substrate and the number of side faces of the cart, experimental data has been gathered. FIGS. 5(A) to 5(C) are graphical diagrams showing the distributions of the intensity on substrates mounted on prism-shaped substrate holders having cross-sections of regular polygons of 6, 12 and 24 sides. In the figure, the abscissa is the distance of the measuring point from the center of a substrate, and the ordinate is the intensity normalized with reference to the maximum intensity measured on the substrate. As shown from the diagrams, the distribution of the intensity becomes more uniform as the number of the faces increases. Namely, the intensity fluctuates over the irradiated surface at larger than 10% in the case of the cart having six faces, while the fluctuation of the intensity is limited within 5% in the cases of the carts having twelve and twenty-four faces. The cart having twenty-four faces may hold forty-eight substrate by mounting two substrates on each face.
FIGS. 6(A) to 6(C) are cross-section views showing an example of CVD process in accordance with the present invention. The surface of a substrate to be coated is provided with a plurality of aluminum lead lines 51. The leads 51 are elongated in the direction perpendicular to the drawing sheet with 0.8 micron in. height, 0.6 micron in width and 0.9 micron in interval as shown in FIG. 6(A). A silicon oxide film is deposited on the substrate over the leads 51 by photo CVD in accordance with the equation (1) to the thickness of 0.3 to 0.5 at about 400° C. as shown in FIG. 6(B). Further, another silicon oxide film 55 is deposited by plasma CVD in accordance with the equation (2) at 200° C. as shown in FIG. 6(C).
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U.S. Classification 134/1.1, 257/E21.278, 257/E21.279, 427/579
International Classification C23C16/44, C23C16/40, C23C16/48, C23C16/56, C23C16/02, C23C16/517, H01L21/316
Cooperative Classification Y10S148/045, Y10S148/017, Y10S148/043, Y10S438/905, C23C16/517, H01L21/31608, C23C16/0245, H01L21/0217, H01L21/02277, C23C16/56, H01L21/02164, H01L21/022, C23C16/4405, C23C16/482, H01L21/02211, H01L21/31612, C23C16/402, H01L21/02216, C23C16/488, H01L21/02274
European Classification H01L21/02K2E3B6B, H01L21/02K2E3B6D, H01L21/02K2C1L9, H01L21/02K2C1L5, H01L21/02K2C3, H01L21/02K2C7C2, H01L21/02K2C7C4B, C23C16/44A6, C23C16/02D4, C23C16/56, C23C16/517, H01L21/316B2, C23C16/48P, C23C16/40B2, H01L21/316B2B, C23C16/48D