DE69332176D1 - Verfahren und Gerät zur Erzeugung eines elektromagnetisch gekoppelten flachen Plasmas zum Ätzen von Oxiden - Google Patents

Verfahren und Gerät zur Erzeugung eines elektromagnetisch gekoppelten flachen Plasmas zum Ätzen von Oxiden

Info

Publication number
DE69332176D1
DE69332176D1 DE69332176T DE69332176T DE69332176D1 DE 69332176 D1 DE69332176 D1 DE 69332176D1 DE 69332176 T DE69332176 T DE 69332176T DE 69332176 T DE69332176 T DE 69332176T DE 69332176 D1 DE69332176 D1 DE 69332176D1
Authority
DE
Germany
Prior art keywords
generating
electromagnetically coupled
flat plasma
coupled flat
etching oxides
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE69332176T
Other languages
English (en)
Other versions
DE69332176T2 (de
Inventor
Kenneth S Collins
Jeffrey Marks
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Applied Materials Inc
Original Assignee
Applied Materials Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25530259&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE69332176(D1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Applied Materials Inc filed Critical Applied Materials Inc
Application granted granted Critical
Publication of DE69332176D1 publication Critical patent/DE69332176D1/de
Publication of DE69332176T2 publication Critical patent/DE69332176T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
    • H01J37/32082—Radio frequency generated discharge
    • H01J37/321—Radio frequency generated discharge the radio frequency energy being inductively coupled to the plasma
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
    • H01J37/32082—Radio frequency generated discharge
    • H01J37/32137—Radio frequency generated discharge controlling of the discharge by modulation of energy
    • H01J37/32155—Frequency modulation
    • H01J37/32165—Plural frequencies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • H01J37/32458—Vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • H01J37/32458—Vessel
    • H01J37/32522—Temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • H01J37/32798—Further details of plasma apparatus not provided for in groups H01J37/3244 - H01J37/32788; special provisions for cleaning or maintenance of the apparatus
    • H01J37/32853—Hygiene
    • H01J37/32871—Means for trapping or directing unwanted particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
    • H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
    • H01L21/3105—After-treatment
    • H01L21/311—Etching the insulating layers by chemical or physical means
    • H01L21/31105—Etching inorganic layers
    • H01L21/31111—Etching inorganic layers by chemical means
    • H01L21/31116—Etching inorganic layers by chemical means by dry-etching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
    • H01L21/6831—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using electrostatic chucks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
    • H01J2237/32—Processing objects by plasma generation
    • H01J2237/33—Processing objects by plasma generation characterised by the type of processing
    • H01J2237/334—Etching
    • H01J2237/3343—Problems associated with etching
    • H01J2237/3345—Problems associated with etching anisotropy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
    • H01J2237/32—Processing objects by plasma generation
    • H01J2237/33—Processing objects by plasma generation characterised by the type of processing
    • H01J2237/334—Etching
    • H01J2237/3343—Problems associated with etching
    • H01J2237/3346—Selectivity

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Analytical Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Epidemiology (AREA)
  • Health & Medical Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Public Health (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Drying Of Semiconductors (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • ing And Chemical Polishing (AREA)
DE69332176T 1992-12-01 1993-12-01 Verfahren und Gerät zur Erzeugung eines elektromagnetisch gekoppelten flachen Plasmas zum Ätzen von Oxiden Expired - Fee Related DE69332176T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US98404592A 1992-12-01 1992-12-01

Publications (2)

Publication Number Publication Date
DE69332176D1 true DE69332176D1 (de) 2002-09-05
DE69332176T2 DE69332176T2 (de) 2003-04-03

Family

ID=25530259

Family Applications (2)

Application Number Title Priority Date Filing Date
DE69332176T Expired - Fee Related DE69332176T2 (de) 1992-12-01 1993-12-01 Verfahren und Gerät zur Erzeugung eines elektromagnetisch gekoppelten flachen Plasmas zum Ätzen von Oxiden
DE69317518T Revoked DE69317518T2 (de) 1992-12-01 1993-12-01 Verfahren und Gerät zur Erzeugung eines elektromagnetisch gekoppelten flachen Plasmas zum Ätzen von Oxyden

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE69317518T Revoked DE69317518T2 (de) 1992-12-01 1993-12-01 Verfahren und Gerät zur Erzeugung eines elektromagnetisch gekoppelten flachen Plasmas zum Ätzen von Oxyden

Country Status (6)

Country Link
US (1) US6217785B1 (de)
EP (2) EP0802560B1 (de)
JP (1) JP3422540B2 (de)
KR (1) KR100281345B1 (de)
DE (2) DE69332176T2 (de)
ES (1) ES2113464T3 (de)

Families Citing this family (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6036877A (en) * 1991-06-27 2000-03-14 Applied Materials, Inc. Plasma reactor with heated source of a polymer-hardening precursor material
US6238588B1 (en) 1991-06-27 2001-05-29 Applied Materials, Inc. High pressure high non-reactive diluent gas content high plasma ion density plasma oxide etch process
US6077384A (en) * 1994-08-11 2000-06-20 Applied Materials, Inc. Plasma reactor having an inductive antenna coupling power through a parallel plate electrode
US6165311A (en) 1991-06-27 2000-12-26 Applied Materials, Inc. Inductively coupled RF plasma reactor having an overhead solenoidal antenna
US6090303A (en) * 1991-06-27 2000-07-18 Applied Materials, Inc. Process for etching oxides in an electromagnetically coupled planar plasma apparatus
US6488807B1 (en) 1991-06-27 2002-12-03 Applied Materials, Inc. Magnetic confinement in a plasma reactor having an RF bias electrode
US20010054601A1 (en) * 1996-05-13 2001-12-27 Jian Ding Low ceiling temperature process for a plasma reactor with heated source of a polymer-hardening precursor material
US6063233A (en) 1991-06-27 2000-05-16 Applied Materials, Inc. Thermal control apparatus for inductively coupled RF plasma reactor having an overhead solenoidal antenna
US6074512A (en) * 1991-06-27 2000-06-13 Applied Materials, Inc. Inductively coupled RF plasma reactor having an overhead solenoidal antenna and modular confinement magnet liners
US6024826A (en) * 1996-05-13 2000-02-15 Applied Materials, Inc. Plasma reactor with heated source of a polymer-hardening precursor material
US5477975A (en) * 1993-10-15 1995-12-26 Applied Materials Inc Plasma etch apparatus with heated scavenging surfaces
US6514376B1 (en) 1991-06-27 2003-02-04 Applied Materials Inc. Thermal control apparatus for inductively coupled RF plasma reactor having an overhead solenoidal antenna
US6835523B1 (en) 1993-05-09 2004-12-28 Semiconductor Energy Laboratory Co., Ltd. Apparatus for fabricating coating and method of fabricating the coating
US5722668A (en) * 1994-04-29 1998-03-03 Applied Materials, Inc. Protective collar for vacuum seal in a plasma etch reactor
US5580385A (en) * 1994-06-30 1996-12-03 Texas Instruments, Incorporated Structure and method for incorporating an inductively coupled plasma source in a plasma processing chamber
TW279240B (en) 1995-08-30 1996-06-21 Applied Materials Inc Parallel-plate icp source/rf bias electrode head
US6156663A (en) * 1995-10-03 2000-12-05 Hitachi, Ltd. Method and apparatus for plasma processing
EP0966028A1 (de) * 1996-01-26 1999-12-22 Matsushita Electronics Corporation Vorrichtung zur herstellung von halbleitern
US6054013A (en) * 1996-02-02 2000-04-25 Applied Materials, Inc. Parallel plate electrode plasma reactor having an inductive antenna and adjustable radial distribution of plasma ion density
US6036878A (en) 1996-02-02 2000-03-14 Applied Materials, Inc. Low density high frequency process for a parallel-plate electrode plasma reactor having an inductive antenna
DE19606375A1 (de) * 1996-02-21 1997-08-28 Balzers Prozes Systeme Gmbh Plasmaquelle mit eingekoppelten Whistler- oder Helikonwellen
US6093660A (en) * 1996-03-18 2000-07-25 Hyundai Electronics Industries Co., Ltd. Inductively coupled plasma chemical vapor deposition technology
US5904778A (en) * 1996-07-26 1999-05-18 Applied Materials, Inc. Silicon carbide composite article particularly useful for plasma reactors
EP0838839B1 (de) * 1996-09-27 2008-05-21 Surface Technology Systems Plc Plasmabearbeitungsgerät
US6534922B2 (en) 1996-09-27 2003-03-18 Surface Technology Systems, Plc Plasma processing apparatus
US6308654B1 (en) 1996-10-18 2001-10-30 Applied Materials, Inc. Inductively coupled parallel-plate plasma reactor with a conical dome
US6132551A (en) * 1997-09-20 2000-10-17 Applied Materials, Inc. Inductive RF plasma reactor with overhead coil and conductive laminated RF window beneath the overhead coil
US6028285A (en) * 1997-11-19 2000-02-22 Board Of Regents, The University Of Texas System High density plasma source for semiconductor processing
US6589437B1 (en) 1999-03-05 2003-07-08 Applied Materials, Inc. Active species control with time-modulated plasma
DE19933842A1 (de) * 1999-07-20 2001-02-01 Bosch Gmbh Robert Vorrichtung und Verfahren zum Ätzen eines Substrates mittels eines induktiv gekoppelten Plasmas
US6401652B1 (en) 2000-05-04 2002-06-11 Applied Materials, Inc. Plasma reactor inductive coil antenna with flat surface facing the plasma
DE10045793C2 (de) 2000-09-15 2002-07-18 Zeiss Carl Verfahren zum Strukturieren eines Substrats
US6899785B2 (en) * 2001-11-05 2005-05-31 International Business Machines Corporation Method of stabilizing oxide etch and chamber performance using seasoning
US7547635B2 (en) * 2002-06-14 2009-06-16 Lam Research Corporation Process for etching dielectric films with improved resist and/or etch profile characteristics
US20040171260A1 (en) * 2002-06-14 2004-09-02 Lam Research Corporation Line edge roughness control
JP5297048B2 (ja) * 2008-01-28 2013-09-25 三菱重工業株式会社 プラズマ処理方法及びプラズマ処理装置
JP4621287B2 (ja) * 2009-03-11 2011-01-26 株式会社イー・エム・ディー プラズマ処理装置
JP5400434B2 (ja) * 2009-03-11 2014-01-29 株式会社イー・エム・ディー プラズマ処理装置
CN112023844A (zh) * 2020-08-12 2020-12-04 陕西科技大学 一种用于材料制备的水热感应加热法及其制备系统
KR20220040804A (ko) 2020-09-24 2022-03-31 삼성전자주식회사 플라즈마 처리 장치 및 플라즈마 처리 방법

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57155732A (en) * 1981-03-20 1982-09-25 Sharp Corp Dry etching
US4350578A (en) * 1981-05-11 1982-09-21 International Business Machines Corporation Cathode for etching
US4427516A (en) 1981-08-24 1984-01-24 Bell Telephone Laboratories, Incorporated Apparatus and method for plasma-assisted etching of wafers
JPS6020163A (ja) * 1983-07-14 1985-02-01 Mitsubishi Electric Corp 合成開口レ−ダ
JPS60201632A (ja) 1984-03-27 1985-10-12 Anelva Corp ドライエツチング装置
US4855017A (en) 1985-05-03 1989-08-08 Texas Instruments Incorporated Trench etch process for a single-wafer RIE dry etch reactor
US4793975A (en) * 1985-05-20 1988-12-27 Tegal Corporation Plasma Reactor with removable insert
US4807016A (en) * 1985-07-15 1989-02-21 Texas Instruments Incorporated Dry etch of phosphosilicate glass with selectivity to undoped oxide
US4711698A (en) 1985-07-15 1987-12-08 Texas Instruments Incorporated Silicon oxide thin film etching process
US4675073A (en) 1986-03-07 1987-06-23 Texas Instruments Incorporated Tin etch process
JPS62254428A (ja) * 1986-04-28 1987-11-06 Nippon Telegr & Teleph Corp <Ntt> 反応性スパツタエツチング方法と反応性スパツタエツチング装置
US4756810A (en) 1986-12-04 1988-07-12 Machine Technology, Inc. Deposition and planarizing methods and apparatus
US4793897A (en) 1987-03-20 1988-12-27 Applied Materials, Inc. Selective thin film etch process
US4786359A (en) 1987-06-24 1988-11-22 Tegal Corporation Xenon enhanced plasma etch
JP2619395B2 (ja) * 1987-07-10 1997-06-11 株式会社日立製作所 プラズマ処理方法
JPH0741153Y2 (ja) 1987-10-26 1995-09-20 東京応化工業株式会社 試料処理用電極
US4918031A (en) 1988-12-28 1990-04-17 American Telephone And Telegraph Company,At&T Bell Laboratories Processes depending on plasma generation using a helical resonator
US4990229A (en) 1989-06-13 1991-02-05 Plasma & Materials Technologies, Inc. High density plasma deposition and etching apparatus
US4948458A (en) * 1989-08-14 1990-08-14 Lam Research Corporation Method and apparatus for producing magnetically-coupled planar plasma
US5085727A (en) * 1990-05-21 1992-02-04 Applied Materials, Inc. Plasma etch apparatus with conductive coating on inner metal surfaces of chamber to provide protection from chemical corrosion
US5169487A (en) * 1990-08-27 1992-12-08 Micron Technology, Inc. Anisotropic etch method
US6090303A (en) * 1991-06-27 2000-07-18 Applied Materials, Inc. Process for etching oxides in an electromagnetically coupled planar plasma apparatus
US5176790A (en) * 1991-09-25 1993-01-05 Applied Materials, Inc. Process for forming a via in an integrated circuit structure by etching through an insulation layer while inhibiting sputtering of underlying metal
US5423945A (en) * 1992-09-08 1995-06-13 Applied Materials, Inc. Selectivity for etching an oxide over a nitride
DE69226253T2 (de) * 1992-01-24 1998-12-17 Applied Materials, Inc., Santa Clara, Calif. Plasmaätzverfahren und Reaktor zur Plasmabearbeitung

Also Published As

Publication number Publication date
EP0601468A1 (de) 1994-06-15
DE69332176T2 (de) 2003-04-03
US6217785B1 (en) 2001-04-17
KR940014908A (ko) 1994-07-19
EP0802560B1 (de) 2002-07-31
ES2113464T3 (es) 1998-05-01
JPH06283473A (ja) 1994-10-07
KR100281345B1 (ko) 2001-03-02
EP0601468B1 (de) 1998-03-18
DE69317518T2 (de) 1998-10-29
JP3422540B2 (ja) 2003-06-30
EP0802560A1 (de) 1997-10-22
DE69317518D1 (de) 1998-04-23

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Legal Events

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8363 Opposition against the patent
8339 Ceased/non-payment of the annual fee