WO2006080276A1 - キャパシタンス素子製造方法、エッチング方法 - Google Patents
キャパシタンス素子製造方法、エッチング方法 Download PDFInfo
- Publication number
- WO2006080276A1 WO2006080276A1 PCT/JP2006/300969 JP2006300969W WO2006080276A1 WO 2006080276 A1 WO2006080276 A1 WO 2006080276A1 JP 2006300969 W JP2006300969 W JP 2006300969W WO 2006080276 A1 WO2006080276 A1 WO 2006080276A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- etching
- gas
- lower electrode
- electrode film
- 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.)
- Ceased
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Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D1/00—Resistors, capacitors or inductors
- H10D1/01—Manufacture or treatment
- H10D1/041—Manufacture or treatment of capacitors having no potential barriers
- H10D1/043—Manufacture or treatment of capacitors having no potential barriers using patterning processes to form electrode extensions, e.g. etching
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P50/00—Etching of wafers, substrates or parts of devices
- H10P50/20—Dry etching; Plasma etching; Reactive-ion etching
- H10P50/28—Dry etching; Plasma etching; Reactive-ion etching of insulating materials
- H10P50/286—Dry etching; Plasma etching; Reactive-ion etching of insulating materials of organic materials
- H10P50/287—Dry etching; Plasma etching; Reactive-ion etching of insulating materials of organic materials by chemical means
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B53/00—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B53/00—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors
- H10B53/30—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors characterised by the memory core region
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D1/00—Resistors, capacitors or inductors
- H10D1/60—Capacitors
- H10D1/68—Capacitors having no potential barriers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D1/00—Resistors, capacitors or inductors
- H10D1/60—Capacitors
- H10D1/68—Capacitors having no potential barriers
- H10D1/692—Electrodes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P50/00—Etching of wafers, substrates or parts of devices
- H10P50/20—Dry etching; Plasma etching; Reactive-ion etching
- H10P50/26—Dry etching; Plasma etching; Reactive-ion etching of conductive or resistive materials
- H10P50/264—Dry etching; Plasma etching; Reactive-ion etching of conductive or resistive materials by chemical means
- H10P50/266—Dry etching; Plasma etching; Reactive-ion etching of conductive or resistive materials by chemical means by vapour etching only
- H10P50/267—Dry etching; Plasma etching; Reactive-ion etching of conductive or resistive materials by chemical means by vapour etching only using plasmas
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P50/00—Etching of wafers, substrates or parts of devices
- H10P50/20—Dry etching; Plasma etching; Reactive-ion etching
- H10P50/28—Dry etching; Plasma etching; Reactive-ion etching of insulating materials
- H10P50/282—Dry etching; Plasma etching; Reactive-ion etching of insulating materials of inorganic materials
- H10P50/283—Dry etching; Plasma etching; Reactive-ion etching of insulating materials of inorganic materials by chemical means
- H10P50/285—Dry etching; Plasma etching; Reactive-ion etching of insulating materials of inorganic materials by chemical means of materials not containing Si, e.g. PZT or Al2O3
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P50/00—Etching of wafers, substrates or parts of devices
- H10P50/71—Etching of wafers, substrates or parts of devices using masks for conductive or resistive materials
Definitions
- the present invention relates to etching of a noble metal, oxide, and noble metal multilayer structure used in ferroelectric memories, piezoelectric MEMS devices, multilayer capacitors, and the like.
- Ferroelectric materials such as Bi Ti O, Pb (Zr, Ti) 0, and (Bi, La) Ti O have low reactivity and
- Patent Document 1 Japanese Patent Laid-Open No. 9-266200
- an object of the present invention is to provide an etching technique suitable for miniaturization.
- the present invention provides a lower electrode film disposed on a substrate, a dielectric film disposed on a partial region of the lower electrode film, and the dielectric film An upper electrode film disposed, an inorganic film disposed on the upper electrode film, and disposed on the inorganic film An etching object (A) in which at least a part of the surface of the lower electrode film and the surface of the organic resist film are exposed, and the lower electrode film and the dielectric are etched.
- the present invention also provides the lower electrode film disposed on the substrate, the dielectric film disposed on the lower electrode film, and the upper electrode disposed on a partial region of the dielectric film.
- a capacitance element manufacturing method comprising a step of etching an etching object (B) whose surface is exposed, wherein the etching object (B) is exposed to plasma of a dielectric film etching gas, and the organic resist film is exposed. In the capacitance element manufacturing method, the dielectric film exposed on the surface of the etching object (B) is etched while remaining, and the etching object (A) is formed.
- the present invention also provides the lower electrode film disposed on the substrate, the dielectric film disposed on the lower electrode film, the upper electrode film disposed on the dielectric film, The inorganic electrode film disposed on a partial region of the upper electrode film and the organic resist film disposed on the inorganic film, and at least a partial surface of the upper electrode film and the organic resist film
- a method of manufacturing a capacitance element comprising: etching an etching target (C) having an exposed surface thereof, wherein the etching target (C) is exposed to plasma of an upper electrode film etching gas, and the organic resist film
- the upper electrode film exposed on the surface of the etching object (C) is etched to form the etching object (B).
- the present invention also provides the lower electrode film disposed on the substrate, the dielectric film disposed on the lower electrode film, the upper electrode film disposed on the dielectric film, The inorganic film disposed on the upper electrode film, and disposed on a partial region of the inorganic film And a step of etching an etching object (D) in which at least a part of the surface of the inorganic film and the surface of the organic resist film are exposed.
- the etching object (D) is exposed to plasma of a metal film etching gas, and the inorganic film exposed on the surface of the etching object (D) is etched while leaving the organic resist film, and the etching object ( C) is a method for manufacturing a capacitance element.
- the lower electrode etching gas is a C1 gas, a Br gas, or a BC1 gas.
- a capacitance element manufacturing method containing at least one kind of gas of 2 2 3 and oxygen gas.
- the lower electrode film is a film containing Pt, Ir, Au, Ru, iridium oxide, noretium oxide, strontium ruthenium oxide, and the dielectric film is an oxide.
- the inorganic film is a Ti film, a TiN film, a TiAIN film, or a laminated film thereof.
- the present invention also provides a lower electrode film disposed on a substrate, a dielectric film disposed on a partial region of the lower electrode film, an upper electrode film disposed on the dielectric film, Etching with an inorganic film disposed on the upper electrode film and an organic resist film disposed on the inorganic film, wherein at least a part of the surface of the lower electrode film and the surface of the organic resist film are exposed
- An etching method for etching an object (A) wherein the etching object (A) is exposed to a plasma of a lower electrode etching gas to leave the inorganic film on the surface of the etching object (A).
- the exposed organic resist film and the lower electrode film are etched.
- the present invention also provides the lower electrode film disposed on the substrate, the dielectric film disposed on the lower electrode film, and the upper electrode disposed on a partial region of the dielectric film.
- An etching method comprising a step of etching an etching target (B) whose surface is exposed, wherein the etching target (B) is exposed to a plasma of a dielectric film etching gas, leaving the organic resist film. However, the surface of the etching object (B) is exposed.
- the present invention also provides the lower electrode film disposed on the substrate, the dielectric film disposed on the lower electrode film, the upper electrode film disposed on the dielectric film, The inorganic electrode film disposed on a partial region of the upper electrode film and the organic resist film disposed on the inorganic film, and at least a partial surface of the upper electrode film and the organic resist film
- the etching method includes a step of etching the etching target object (C) having the surface exposed to the surface, wherein the etching target object (C) is exposed to plasma of an upper electrode film etching gas, and the organic resist film is removed.
- the upper electrode film exposed on the surface of the object to be etched (C) is etched while remaining to form the object to be etched (B).
- the present invention also provides the lower electrode film disposed on the substrate, the dielectric film disposed on the lower electrode film, the upper electrode film disposed on the dielectric film, The inorganic film disposed on the upper electrode film and the organic resist film disposed on a partial region of the inorganic film, at least a partial surface of the inorganic film and a surface of the organic resist film And etching the etching object (D) where the etching object is exposed, wherein the etching object (D) is exposed to a plasma of a metal film etching gas to leave the organic resist film while leaving the organic resist film.
- the inorganic film exposed on the surface of the etching object (D) is etched to form the etching object (C).
- the lower electrode etching gas is a C1 gas, a Br gas, or a BC1 gas.
- the lower electrode film is a film containing Pt, Ir, Au, Ru, iridium oxide, noretium oxide, strontium ruthenium oxide, and the dielectric film is an oxide.
- the inorganic film is a Ti film, a TiN film, a TiAIN film, or a laminated film thereof.
- FIG. 2 (e) to (g): Cross-sectional view for explaining the method of the present invention
- FIG. 3 is a graph for explaining the difference in etching rate depending on the presence or absence of 0 gas.
- Reference numeral 5 in FIGS. L (a) to (d) and FIGS. 2 (e) to (g) represents a processing object to which the method of the present invention can be applied.
- the processing object 5 has a semiconductor substrate 10 as shown in FIG. 1 (a). On the semiconductor substrate 10, an insulating film 11, a lower electrode film 12, and a dielectric The film 13 and the upper electrode film 14 are formed in this order from the lower layer.
- the dielectric film 13, and the upper electrode film 14 of the processing object 5 by etching, first, as shown in FIG. An inorganic film 15 is formed on the surface of the upper electrode film 14, and then a patterned organic resist film 20 is formed on the surface of the exposed inorganic film 15 as shown in FIG. D) is formed. The surface of the inorganic film 15 is partially covered by the organic resist film 20.
- the organic resist film 20 is an ordinary photoresist film for semiconductors, is made of a photoreactive resin, and is patterned by exposure-development.
- the first etching gas is a gas that can etch the inorganic film 15 without etching the organic resist film 20 and the upper electrode film 14, and the inorganic film 15 is a Ti film, Ta film, Zr film, Hf C1 gas, BC1 gas in the case of a film, or nitride film thereof (for example, TiN film) or TiAIN film
- the inorganic film is a Ti film, TiN film, or TiAIN film.
- the organic resist film 20 is moved to the second reaction chamber without peeling off, and a second etching gas (upper electrode etching) different from the first etching gas is moved into the second reaction chamber. Gas) is introduced to form a second etching gas plasma, and the upper electrode film 14 exposed on the surface is etched using the organic resist film 20 as a mask. As a result, the upper electrode film 14 other than the portion protected by the organic resist film 20 and the inorganic film 15 is etched, and the surface of the dielectric film 13 is partially exposed as shown in FIG. An etching object (B) is formed.
- a second etching gas upper electrode etching
- the second etching gas is a gas that etches the upper electrode film 14 without etching the organic resist film 20 and the dielectric film 13.
- the upper electrode film 14 and the lower electrode film 12 are made of a metal film of Pt, Ir, Au, Ru, or an alloy thereof, an oxide film such as iridium oxide, ruthenium oxide, strontium ruthenium oxide, or the like. It can be constituted by a laminated film of metal films, a laminated film of those oxide films, or a laminated film of these metal films and those oxide films.
- a mixed gas of rare gas such as Ar gas and BC1 gas can be used as the second etching gas.
- the organic resist film 20 is moved to the third reaction chamber without peeling off, and the third reaction chamber is moved.
- a third etching gas (dielectric etching gas) different from the second etching gas is introduced into the inside, and plasma of the third etching gas is formed and exposed to the surface using the organic resist film 20 as a mask.
- the dielectric film 13 to be etched is etched.
- the organic resist film 20 and the dielectric film 13 other than the portion protected by the inorganic film 15 are etched, and the surface of the lower electrode film 12 is partially exposed and etched as shown in FIG.
- the object (A) is formed.
- An upper electrode film 14 is located between the remaining dielectric film 13 and the inorganic film 15.
- the third etching gas is a gas that etches the dielectric film 13 without etching the organic resist film 20 and the lower electrode film 12, and the dielectric film 13 includes (Ba, Sr) TiO, SrTiO, etc.
- the third etching gas is A
- r Contains rare gas such as gas and CF gas, and any of BC1 gas, HBr gas, C1 gas
- Etching gas containing one or more kinds of gases can be used.
- the organic resist film 20 is thinned. Etching of the dielectric film 13 When the process is completed, the organic resist film 20 remains.
- the organic resist film 20 is moved to the fourth reaction chamber without being peeled off, and a fourth etching gas for etching the organic resist film 20 and the lower electrode film 12 in the fourth reaction chamber is obtained. (Lower electrode etching gas) is introduced to form the plasma.
- the organic resist film 20 is not etched when the upper electrode film 14 described above is etched, and the organic resist film 20 is etched when the lower electrode film 12 is etched.
- the fourth etching gas used here is a mixed gas of rare gas such as Ar gas, C1 gas and O gas.
- the fourth etching gas may contain O gas at a volume ratio of 25% or more.
- the resist film 20 is quickly removed.
- the organic resist film 20 is used as a mask to etch the lower electrode film 12
- the etching speed of the organic resist film 20 is fast.
- the etching of the lower electrode film 12 is not completed.
- the inorganic film 15 is not etched by the fourth etching gas, after the organic resist film 20 is removed, the inorganic film 15 serves as a mask, and the portion covered with the inorganic film 15 is protected. In this state, the etching of the lower electrode film 12 whose surface is partially exposed proceeds, the exposed portion of the lower electrode film 12 is removed, and the insulating film 11 is exposed. As a result, a capacitance element is obtained by the patterned lower electrode film 12, dielectric film 13, and upper electrode film 14, respectively.
- etching gas If an etching gas is used, the etching gas plasma and the residue of the organic resist film react to produce an etching product containing carbon. This product tends to redeposit on the pattern sidewalls. Therefore, etching gas that does not contain O gas
- the organic resist film 20 does not remain.
- the etching gas for the oxide dielectric cannot contain a large amount of O gas. Also
- the fourth etching gas of the present invention contains O 2 in the gas for etching the lower electrode film 12.
- the organic resist film 20 can be quickly removed without increasing the number of steps.
- the removal of the organic resist film 20 is particularly rapid when O gas is contained in an amount of 25% by volume or more.
- the inorganic film 15 is exposed to an etching gas plasma containing O gas, the inorganic film 15
- An oxide film of the constituent material of the inorganic film 15 is formed on the surface 15 so that the etching does not proceed, and the portion covered with the inorganic film 15 is protected. Containing O gas at a concentration of 25% or more
- the graph of Fig. 3 shows that an inorganic film 15 made of a TiN film is etched with a mixed gas of C1 gas and O gas.
- the force in which the upper electrode film 14 and the lower electrode film 12 are single-layer films is used in the present invention.
- the upper electrode film 14 and the lower electrode film 12 may be a multilayer film in which one kind or two or more kinds of films are laminated.
- the reaction chamber is changed every time the film to be etched is changed, but the inorganic film 15 to the lower electrode film 12 may be continuously etched in the same reaction chamber.
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- Drying Of Semiconductors (AREA)
- Semiconductor Memories (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007500496A JPWO2006080276A1 (ja) | 2005-01-28 | 2006-01-23 | キャパシタンス素子製造方法、エッチング方法 |
| DE112006000261.9T DE112006000261B4 (de) | 2005-01-28 | 2006-01-23 | Verfahren zur Herstellung eines kapazitiven Elements mittels Ätzverfahren |
| CN2006800033282A CN101111929B (zh) | 2005-01-28 | 2006-01-23 | 电容元件的制造方法以及蚀刻方法 |
| US11/878,172 US20080026539A1 (en) | 2005-01-28 | 2007-07-20 | Capacitance element manufacturing method and etching method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005-020788 | 2005-01-28 | ||
| JP2005020788 | 2005-01-28 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/878,172 Continuation US20080026539A1 (en) | 2005-01-28 | 2007-07-20 | Capacitance element manufacturing method and etching method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006080276A1 true WO2006080276A1 (ja) | 2006-08-03 |
Family
ID=36740307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2006/300969 Ceased WO2006080276A1 (ja) | 2005-01-28 | 2006-01-23 | キャパシタンス素子製造方法、エッチング方法 |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20080026539A1 (ja) |
| JP (1) | JPWO2006080276A1 (ja) |
| KR (1) | KR20070091044A (ja) |
| CN (1) | CN101111929B (ja) |
| DE (1) | DE112006000261B4 (ja) |
| TW (1) | TW200633053A (ja) |
| WO (1) | WO2006080276A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010021478A (ja) * | 2008-07-14 | 2010-01-28 | Murata Mfg Co Ltd | 薄膜積層体の加工方法 |
| JP2012114156A (ja) * | 2010-11-22 | 2012-06-14 | Ulvac Japan Ltd | 圧電素子の製造方法 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160036090A (ko) * | 2008-02-08 | 2016-04-01 | 램 리써치 코포레이션 | 이중 마스크 자기정렬 이중 패터닝 기술 (sadpt) 프로세스 |
| US7981760B2 (en) * | 2008-05-08 | 2011-07-19 | Panasonic Corporation | Method for manufacturing nonvolatile storage element and method for manufacturing nonvolatile storage device |
| CN103907187B (zh) * | 2012-09-05 | 2016-04-13 | 株式会社爱发科 | 电阻转变元件及其制作方法 |
| CN104752198B (zh) * | 2013-12-29 | 2017-07-21 | 北京北方微电子基地设备工艺研究中心有限责任公司 | 基片刻蚀方法 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6439027A (en) * | 1987-08-04 | 1989-02-09 | Sanyo Electric Co | Formation of electrode |
| JP2001244426A (ja) * | 1999-12-22 | 2001-09-07 | Texas Instr Inc <Ti> | 強誘電メモリ・セルの製造方法 |
| JP2003282844A (ja) * | 2002-03-12 | 2003-10-03 | Agilent Technol Inc | ハードマスク及びCl2/N2/O2及びCl2/CHF3/O2の化学的性質を利用するIr及びPZTのプラズマエッチング |
| JP2003298022A (ja) * | 2002-03-29 | 2003-10-17 | Seiko Epson Corp | 強誘電体メモリ及びその製造方法 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100329774B1 (ko) * | 1998-12-22 | 2002-05-09 | 박종섭 | 강유전체 기억소자의 캐패시터 형성 방법 |
-
2006
- 2006-01-23 KR KR1020077017287A patent/KR20070091044A/ko not_active Ceased
- 2006-01-23 DE DE112006000261.9T patent/DE112006000261B4/de not_active Expired - Lifetime
- 2006-01-23 CN CN2006800033282A patent/CN101111929B/zh not_active Expired - Lifetime
- 2006-01-23 JP JP2007500496A patent/JPWO2006080276A1/ja active Pending
- 2006-01-23 WO PCT/JP2006/300969 patent/WO2006080276A1/ja not_active Ceased
- 2006-01-25 TW TW095102889A patent/TW200633053A/zh unknown
-
2007
- 2007-07-20 US US11/878,172 patent/US20080026539A1/en not_active Abandoned
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6439027A (en) * | 1987-08-04 | 1989-02-09 | Sanyo Electric Co | Formation of electrode |
| JP2001244426A (ja) * | 1999-12-22 | 2001-09-07 | Texas Instr Inc <Ti> | 強誘電メモリ・セルの製造方法 |
| JP2003282844A (ja) * | 2002-03-12 | 2003-10-03 | Agilent Technol Inc | ハードマスク及びCl2/N2/O2及びCl2/CHF3/O2の化学的性質を利用するIr及びPZTのプラズマエッチング |
| JP2003298022A (ja) * | 2002-03-29 | 2003-10-17 | Seiko Epson Corp | 強誘電体メモリ及びその製造方法 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010021478A (ja) * | 2008-07-14 | 2010-01-28 | Murata Mfg Co Ltd | 薄膜積層体の加工方法 |
| JP2012114156A (ja) * | 2010-11-22 | 2012-06-14 | Ulvac Japan Ltd | 圧電素子の製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE112006000261B4 (de) | 2014-05-08 |
| JPWO2006080276A1 (ja) | 2008-06-19 |
| CN101111929A (zh) | 2008-01-23 |
| DE112006000261T5 (de) | 2007-12-13 |
| KR20070091044A (ko) | 2007-09-06 |
| CN101111929B (zh) | 2010-05-19 |
| TW200633053A (en) | 2006-09-16 |
| US20080026539A1 (en) | 2008-01-31 |
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