Source: http://www.google.com/patents/US7842617?dq=6,128,731
Timestamp: 2016-07-01 00:05:38
Document Index: 456190940

Matched Legal Cases: ['art 70', 'art 70', 'art 70', 'art 70', 'art 70', 'art 70', 'arts 70', 'art 70', 'art 70']

Patent US7842617 - Etching method and etching apparatus - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsThe present invention is an etching method for performing an etching process in the presence of a plasma on an object to be processed in which a layer to be etched made of a tungsten-containing material is formed on a base layer made of a silicon-containing material in a process vessel capable of being...http://www.google.com/patents/US7842617?utm_source=gb-gplus-sharePatent US7842617 - Etching method and etching apparatusAdvanced Patent SearchPublication numberUS7842617 B2Publication typeGrantApplication numberUS 11/791,718PCT numberPCT/JP2005/021256Publication dateNov 30, 2010Filing dateNov 18, 2005Priority dateNov 29, 2004Fee statusPaidAlso published asCN100580887C, CN101069272A, US20080138996, WO2006057202A1Publication number11791718, 791718, PCT/2005/21256, PCT/JP/2005/021256, PCT/JP/2005/21256, PCT/JP/5/021256, PCT/JP/5/21256, PCT/JP2005/021256, PCT/JP2005/21256, PCT/JP2005021256, PCT/JP200521256, PCT/JP5/021256, PCT/JP5/21256, PCT/JP5021256, PCT/JP521256, US 7842617 B2, US 7842617B2, US-B2-7842617, US7842617 B2, US7842617B2InventorsTetsuya NishizukaOriginal AssigneeTokyo Electron LimitedExport CitationBiBTeX, EndNote, RefManPatent Citations (11), Non-Patent Citations (3), Referenced by (1), Classifications (12), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetEtching method and etching apparatus
US 7842617 B2Abstract
1. An etching method for performing an etching process in the presence of a plasma on an object to be processed in which a layer to be etched made of a tungsten, tungsten nitride, or a combination of tungsten and tungsten nitride is on a base layer made of a silicon-containing material in a process vessel capable of being evacuated to create therein a vacuum, wherein
a chlorine gas, an oxygen gas and a nitrogen gas are used exclusively as an etching gas for performing the etching process,
an added amount of the oxygen gas relative to a total flowrate of the chlorine gas and the nitrogen gas is within a range between 2.9% and 8.6%, and
a flowrate of the nitrogen gas relative to the total flowrate of the chlorine gas and the nitrogen gas is within a range between 50% to 80%.
2. The etching method according to claim 1, wherein the plasma is generated by a microwave.
3. The etching method according to claim 1, wherein the etching process is performed in the process vessel including a planar antenna member of an RLSA (Radial Line Slot Antenna) type.
4. The etching method according to claim 1, wherein the base layer is formed of a polysilicon layer, and
the layer to be etched has a laminated structure of a tungsten nitride film and a tungsten film.
5. The etching method according to claim 1, wherein
the added amount of the oxygen gas relative to the total flowrate of the chlorine gas and the nitrogen gas is within a range between 4.3% and 5.7%, and
the flowrate of the nitrogen gas relative to the total flowrate of the chlorine gas and the nitrogen gas is within a range between 70% to 80%. Description
FIG. 1 is a schematic view of the etching apparatus in one embodiment of the present invention. FIG. 2 is a plan view of a planar antenna member of a plasma generating unit. FIG. 3 is a bottom view of a showerhead part of a gas supplying unit. Herein, an etching apparatus using a planar antenna member of an RLSA type (Radial Line Slot Antenna) is described by way of an example.
A gas supply unit 64 for supplying a gas required for an etching process into the process vessel 24 is disposed above the stage 26. In more detail, as shown in FIG. 3, the gas supply unit 64 includes a showerhead part 70 having: gas channels 66 arranged like a grid, a ring-shaped gas channel 66 a, and a number of gas jetting holes 68 formed in the gas channels 66. In this case, each end of the grid-like gas channels 66 is connected to the ring-shaped gas channel 66 a, whereby an enough amount of the gas can flow through the respective gas channels 66. In addition, the showerhead part 70 is provided with a number of openings 72 at positions excluding the gas channels 66 and 66 a. Since the openings 72 are provided vertically through the showerhead part 70, the gas can pass through these openings 72 in up and down directions. In order to maintain a durability of the showerhead part 70 against the etching gas, the showerhead part 70 may be generally formed of quartz or aluminum. Specifically, when a chlorine-group gas is used, the showerhead part 70 is preferably made of quartz.
A gas passage 74 extending outside is connected to the ring-shaped gas channel 66 a. The gas passage 74 is divided into branching passages, each of which is provided with an on-off valve 76 and a flowrate controller 78 such as a massflow controller, and is connected to each gas source. Here, a chlorine-containing gas, an oxygen-containing gas, and a nitrogen-containing gas are used as the etching gas. More specifically, there are used a Cl2 gas source 80A storing the Cl2 gas as the chlorine-containing gas, an O2 gas source 80B storing the O2 gas as the oxygen-containing gas, and an N2 gas source 80C storing the N2 gas as the nitrogen-containing gas. An alternative structure may be adopted in which two showerhead parts 70 having the above-described structure are arranged in the up and down direction, and the O2 gas and the N2 gas are fed from one showerhead part 70, while the Cl2 gas is fed through the other showerhead part 70.
Regarding the process conditions in this embodiment, the process temperature is within a range between, e.g., 60� C. and 80� C., and the process pressure is within a range between e.g., 0.5 Pa and 2 Pa.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4579623 *Aug 21, 1984Apr 1, 1986Hitachi, Ltd.Method and apparatus for surface treatment by plasmaUS5880033 *Jun 17, 1996Mar 9, 1999Applied Materials, Inc.Method for etching metal silicide with high selectivity to polysiliconUS6723652 *Feb 24, 2000Apr 20, 2004Sony CorporationDry etching method and method of manufacturing semiconductor apparatusUS20010008806 *Feb 8, 2001Jul 19, 2001Hideo KitagawaProcess for producing a semiconductor deviceJP2000252259A Title not availableJP2002355550A Title not availableJP2004119781A Title not availableJP2004273532A Title not availableJPH10116824A Title not availableJPH11135481A Title not availableWO2002080253A1Mar 28, 2002Oct 10, 2002Tokyo Electron LimitedDevice and method for plasma processing, and slow-wave plate* Cited by examinerNon-Patent CitationsReference1International Preliminary Report on Patentability (Form PCT/IB/373) in connection with PCT/JP2005/021256, dated Jan. 2004.2Notification of Transmittal of Copies of Translation of the International Preliminary Report on Patentability (Form PCT/IB/338) in connection with PCT/JP2005/021256, dated Jan. 2004.3Written Opinion of the International Searching Authority (Form PCT/ISA/237) in connection with PCT/JP2005/021256, dated Jan. 2004.Referenced byCiting PatentFiling datePublication dateApplicantTitleWO2012166364A1 *May 16, 2012Dec 6, 2012Lam Research CorporationGas distribution showerhead for inductively coupled plasma etch reactor* Cited by examinerClassifications U.S. Classification438/710, 216/79, 438/718, 216/75International ClassificationH01L21/461, H01L21/302Cooperative ClassificationH01L21/32136, H01J37/32192, C23F4/00European ClassificationH01L21/3213C4B, C23F4/00, H01J37/32M10Legal EventsDateCodeEventDescriptionMay 29, 2007ASAssignmentOwner name: TOKYO ELECTRON LIMITED, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NISHIZUKA, TETSUYA;REEL/FRAME:019396/0901Effective date: 20070423Apr 30, 2014FPAYFee 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