EP1203405A2 - Verfahren zum ätzen von wismuthaltigen oxidfilmen - Google Patents
Verfahren zum ätzen von wismuthaltigen oxidfilmenInfo
- Publication number
- EP1203405A2 EP1203405A2 EP00958225A EP00958225A EP1203405A2 EP 1203405 A2 EP1203405 A2 EP 1203405A2 EP 00958225 A EP00958225 A EP 00958225A EP 00958225 A EP00958225 A EP 00958225A EP 1203405 A2 EP1203405 A2 EP 1203405A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- etching solution
- oxide
- bismuth
- oxide film
- substrate
- 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.)
- Withdrawn
Links
Classifications
-
- 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 at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System 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
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3063—Electrolytic 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
- H01L21/02—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 at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
- C09K13/08—Etching, surface-brightening or pickling compositions containing an inorganic acid containing a fluorine compound
Definitions
- the present invention relates to a method for etching bismuth-containing oxide films.
- the present invention further relates to a method for structuring bismuth-containing oxide films.
- Ferroelectric memory arrangements have the advantage over conventional memory arrangements, such as DRAMs and SRAMs, that the stored information is not lost, but remains stored even when the voltage or power supply is interrupted.
- This non-volatility of ferroelectric memory arrangements is based on the fact that, in ferroelectric materials, the polarization impressed by an external electric field is essentially retained even after the external electric field has been switched off.
- Ferroelectric layers e.g. B. from PZT (lead zircon titanate), z. B. wet chemical using HF. Structure HN0 3 and H 2 0 2 .
- ferroelectric memory arrangements in particular highly integrated ferroelectric memory arrangements, it has been proposed to use mixed oxides containing bismuth, for example strontium bismuth tantalate (SBT, SrBi 2 Ta 2 0 9 ), as the ferroelectric layer.
- SBT strontium bismuth tantalate
- the object is achieved according to the invention by a method for etching oxide films which contain at least one bismuth-containing oxide, in particular an erroelectric one. mixed oxide containing smut.
- the method comprises the following steps: a substrate is provided on which at least one oxide film, which comprises at least one bismuth-containing oxide, is applied; an etching solution is brought into contact with the substrate so that the etching solution can react with the oxide film, the etching solution comprising 2 to 20 percent by weight of a fluoride ion donor, 15 to 60 percent by weight of nitric acid and 20 to 83 percent by weight of water; and the etching solution is removed from the substrate.
- fluoride ion donor here encompasses all fluorine-containing compounds which dissociate at least partially in m aqueous solution and fluoride anions and countercations.
- Preferred embodiments are the F_jo ⁇ d ions Donor ammonium fluoride NH 4 F and / or ammonium hydrogen fluoride NH 4 HF 2 .
- bringing into contact encompasses all methods customary in wet-chemical etching, in particular immersing the substrate in the etching solution or spraying the substrate with the etching solution.
- the etching solution for pH regulation additionally includes mineral acids, in particular hydrochloric acid HCl or sulfuric acid H 2 SO 4 and / or inorganic salts of mineral acids, in particular ammonium chloride NH 4 C1 or ammonium bromide NH 4 Br.
- mineral acids in particular hydrochloric acid HCl or sulfuric acid H 2 SO 4
- inorganic salts of mineral acids in particular ammonium chloride NH 4 C1 or ammonium bromide NH 4 Br.
- these additives can be used to achieve acidification or buffering, so that the etching solution can be variably adjusted to the properties of the film to be etched.
- the polarity of the etching solution can be influenced by these additives and individually tailored to the solubility of the end products of the etching process.
- the etching solution can contain organic surface-active substances, preferably alcohols, in particular ethanol or isopropanol, and / or acids, in particular acetic acid or propionic acid. These organic additives make it possible to modify the surface tension of the etching solution and thus regulate the wetting ability of the etching solution.
- the oxide film to be etched is a tempered oxide film.
- the oxide ions in the bismuth-containing oxide layer are protonated by the acid and are thus converted into hydroxide ions. These could be caused by fluoride ions which have a comparable ion radius v / ie the hydroxide ions can be easily replaced. This leads to the formation of acid-soluble fluoride complexes.
- an oxide film is etched, which consists of a mixture of strontium oxide SrO, bismuth trioxide Bi 2 0 3 and tantalum pentaoxide Ta 2 0 5 .
- the oxide film to be etched comprises at least one of the oxides of the group consisting of strontium bismuth tantalate SrBi 2 Ta 2 0 9 , strontium bismuth tantalate derivatives in which tantalum is at least partially derived from another metal from the group of Transition metals or lanthanoids is replaced, bismuth titanate Bi 4 Ti 3 0 12 , and the strontium bismuth titanates SrBi 4 Ti 4 0 5 and Sr 2 Bi 4 Ti 5 0 8 includes.
- the oxide film comprises at least one niobium-doped oxide of the general composition SrBi 2 Ta 2 _ x Nb x 0 9 with 0 ⁇ x ⁇ 2.
- the bismuth-containing oxide films according to the invention can be applied to the substrate by any of the methods customary in semiconductor technology, in particular by CVD, sol-gel or sputtering methods.
- the substrate is treated with an aqueous hydrochloric acid solution after the etching solution has been removed.
- This treatment allows residues that may remain on the substrate after the etching solution has been removed and removed, can be removed simply and quickly from the substrate and the surface of the substrate can thus be prepared for further processing.
- the action of the etching solution on the oxide film is supported by mechanical rubbing.
- mechanical rubbing is particularly important here to understand the methods of mechanical polishing or chemical mechanical polishing known to the person skilled in the art.
- the present invention further comprises a method for structuring oxide films which comprise at least one bismuth-containing oxide, in particular a ferroelectric bismuth-containing mixed oxide, the method comprising the following steps: a substrate is provided which has an oxide film on its surface which has at least one bismuth - Contains containing oxide, has; a mask is applied to the oxide film; an etching solution is brought into contact with the substrate so that the etching solution can react with the areas of the oxide film not covered by the mask, the etching solution being 2 to 20 percent by weight of a fluoride ion donor, 15 to 60 percent by weight of nitric acid and 20 to 80 percent by weight Includes water; the etching solution is removed from the substrate; and the mask is removed.
- Suitable oxide films Since the annealed oxide films often have a higher chemical resistance to etching solutions, the etching of untempered films enables the use of highly diluted etching solutions, which allow a more gentle etching for the substrate.
- a photoresist is applied to the oxide layer after the application of a strontium bismuth tantalate oxide film to the substrate and after its tempering.
- Photoresists and methods for applying them are known to the person skilled in the art. According to common methods, the photoresist is exposed through a mask and then developed and removed from the unexposed areas. An etching solution of suitable dilution described in the claims is then brought into contact with the substrate so that the etching solution can act on the oxide film. After the suitable etching time, in which the oxide film is removed in the areas that are not protected by the photoresist, the etching solution is removed from the substrate. In general, the etching solution is removed from the substrate in the present invention by the methods known in semiconductor technology. In particular, this can be done by removing the substrate from the etching solution, or by rinsing the substrate with one or more washing solutions, such as water.
- the substrate can be post-treated with one or more washing solutions after removal from the etching solution:
- one or more washing solutions after removal from the etching solution:
- the substrate can be rinsed with volatile, preferably water-miscible solvents, such as acetone , After removing the etching solution from the substrate, the photoresist is then removed.
- the structuring takes place before the annealing of the oxide film.
- a structured photoresist layer is applied to the oxide layer deposited on the substrate by conventional methods, as described above, and then removed in the uncovered areas by means of an etching solution described in the patent application.
- generally thinner etching solutions can be used to accomplish the removal of the oxide layer. This is advantageous if the substrate is to be etched particularly gently, ie if a possible reaction of the substrate with the etching solution is to be avoided.
- Etching solutions Suitable etching solutions for the methods according to the invention can be obtained as follows:
- ⁇ tzlöb_sung 1 1.25g ammonium fluoride NH 4 F in 6.8g 65% ig_ee_schreibrr SS with aa_ ⁇ ll_pp_ee .._ tt.eerrssää ⁇ uurree H H N N ⁇ 0 33 gg e eil6ö s s t t ..
- Etching solution la A proportion by weight of the etching solution 1 is diluted with a proportion by weight of deionized water H 2 0.
- Etching solutions Ib A part by weight of the etching solution 1 is diluted with two parts by weight of deionized water H 2 0.
- Etching solution 2 1.9g ammonium hydrogen fluoride NH 4 HF 2 are dissolved in 7.0g 65% nitric acid.
- Etching solution 2a A part by weight of the etching solution 2 is diluted with a part by weight of deionized water H 2 0.
- Etching solutions 2b A part by weight of the etching solution 2 is diluted with two parts by weight of deionized water H 2 0.
- compositions and the proportions by weight of the components to one another are listed in Table 1 below.
- Table 1 Compositions of the etching solutions 1, la, lb, 2, 2a and 2b.
- a SrO / Bi 2 0 3 / Ta 2 0 5 film with a thickness of 120 nm is deposited on a Pt electrode at a temperature of about 430 ° C.
- the film has a composition in which Sr, Bi and Ta are in a ratio of 18% Sr, 45% Bi and 37% Ta.
- the Pt electrode is then annealed with the SrO / Bi 2 0 3 / Ta 2 0 5 film at a temperature of about 800 ° C. for one hour in a 0 2 atmosphere.
- the etching solutions used in the methods according to the invention can also comprise pH-regulating additives and surface-active additives.
- etching solutions By adding further inorganic components, such as NH 4 C1, NH 4 Br or inorganic mineral acids such as HCl or H 2 S0 4 , a buffer formation or an acidification of the etching solutions can be achieved.
- the polarity of the etching solution can be influenced by these additives and thus the solubility of the end products of the etching process can be further improved.
- a modification of the surface tension of the etching solution can be achieved, and thus the wetting ability of the etching solution can be regulated.
- Particularly suitable classes of compounds are alcohols, in particular ethanol or isopropanol, and acids, in particular acetic acid or propionic acid.
- the invention enables the etching and / or structuring of oxide films which comprise at least one bismuth-containing oxide, in particular a ferroelectric bismuth-containing mixed oxide.
- layers can be etched or structured using the method according to the invention from a mixture of strontium oxide SrO, bismuth trioxide Bi 2 0 3 and tantalum pentaoxide Ta 2 0 5 .
- the methods according to the invention are suitable for etching or structuring layers of strontium bismuth tantalate SrBi 2 Ta 2 0 9 or strontium bismuth tantalate derivatives in which tantalum is at least partially replaced by another metal from the group of transition metals or lanthanoids.
- Such derivatives are, for example, a niobium-doped oxide of the general composition SrBi 2 Ta 2-x Nb x 0 9 with 0 ⁇ x ⁇ 2.
- Other suitable layer materials are bismuth titanate BiTi 3 0 ⁇ 2 , and the strontium bismuth titanates SrBi 4 Ti 4 0i5 and Sr 2 Bi 4 Ti 5 0 ⁇ 8 .
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19937503A DE19937503C1 (de) | 1999-08-09 | 1999-08-09 | Verfahren zum Ätzen von wismuthaltigen Oxidfilmen |
DE19937503 | 1999-08-09 | ||
PCT/DE2000/002652 WO2001011673A2 (de) | 1999-08-09 | 2000-08-09 | Verfahren zum ätzen von wismuthaltigen oxidfilmen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1203405A2 true EP1203405A2 (de) | 2002-05-08 |
Family
ID=7917703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00958225A Withdrawn EP1203405A2 (de) | 1999-08-09 | 2000-08-09 | Verfahren zum ätzen von wismuthaltigen oxidfilmen |
Country Status (8)
Country | Link |
---|---|
US (1) | US6669857B2 (de) |
EP (1) | EP1203405A2 (de) |
JP (1) | JP2003506895A (de) |
KR (1) | KR100463364B1 (de) |
CN (1) | CN1252802C (de) |
DE (1) | DE19937503C1 (de) |
TW (1) | TW466635B (de) |
WO (1) | WO2001011673A2 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10244862B4 (de) * | 2002-09-23 | 2006-09-14 | IHP GmbH - Innovations for High Performance Microelectronics/Institut für innovative Mikroelektronik | Verfahren zur Herstellung eines elektronischen Bauelements mit einer Praseodymoxid-Schicht |
US20040188385A1 (en) * | 2003-03-26 | 2004-09-30 | Kenji Yamada | Etching agent composition for thin films having high permittivity and process for etching |
TW200709294A (en) * | 2005-06-13 | 2007-03-01 | Advanced Tech Materials | Compositions and methods for selective removal of metal or metal alloy after metal silicide formation |
KR101294906B1 (ko) | 2006-11-16 | 2013-08-08 | 동우 화인켐 주식회사 | 반도체 소자 제조공정의 선택적 식각액 |
TW200833871A (en) * | 2006-11-17 | 2008-08-16 | Sachem Inc | Selective metal wet etch composition and process |
WO2010086745A1 (en) * | 2009-02-02 | 2010-08-05 | Atmi Taiwan Co., Ltd. | Method of etching lanthanum-containing oxide layers |
JP2013102089A (ja) * | 2011-11-09 | 2013-05-23 | Adeka Corp | チタン酸鉛系材料用エッチング剤組成物 |
KR20140086666A (ko) * | 2012-12-28 | 2014-07-08 | 동우 화인켐 주식회사 | 금속 산화물막의 식각액 조성물 |
KR20140086668A (ko) * | 2012-12-28 | 2014-07-08 | 동우 화인켐 주식회사 | 금속 산화물막의 식각액 조성물 |
KR20140086669A (ko) * | 2012-12-28 | 2014-07-08 | 동우 화인켐 주식회사 | 금속 산화물막의 식각액 조성물 |
KR102456079B1 (ko) | 2014-12-24 | 2022-11-21 | 삼성디스플레이 주식회사 | 산화물 제거용 세정 조성물 및 이를 이용한 세정 방법 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3925079A (en) * | 1972-06-16 | 1975-12-09 | Richard W F Hager | Decorative article and method of making same |
JPS5810852A (ja) * | 1981-07-10 | 1983-01-21 | Fujitsu Ltd | 半導体装置 |
US4759823A (en) | 1987-06-02 | 1988-07-26 | Krysalis Corporation | Method for patterning PLZT thin films |
US5407855A (en) * | 1993-06-07 | 1995-04-18 | Motorola, Inc. | Process for forming a semiconductor device having a reducing/oxidizing conductive material |
US5873977A (en) * | 1994-09-02 | 1999-02-23 | Sharp Kabushiki Kaisha | Dry etching of layer structure oxides |
US5708302A (en) * | 1995-04-26 | 1998-01-13 | Symetrix Corporation | Bottom electrode structure for dielectric capacitors |
EP0968979A1 (de) * | 1998-06-30 | 2000-01-05 | Siemens Aktiengesellschaft | Ätzen von Metalloxidkeramiken auf Bi-Basis |
-
1999
- 1999-08-09 DE DE19937503A patent/DE19937503C1/de not_active Expired - Fee Related
-
2000
- 2000-08-09 WO PCT/DE2000/002652 patent/WO2001011673A2/de not_active Application Discontinuation
- 2000-08-09 JP JP2001516233A patent/JP2003506895A/ja active Pending
- 2000-08-09 EP EP00958225A patent/EP1203405A2/de not_active Withdrawn
- 2000-08-09 KR KR10-2002-7001722A patent/KR100463364B1/ko not_active IP Right Cessation
- 2000-08-09 CN CNB008114781A patent/CN1252802C/zh not_active Expired - Fee Related
- 2000-08-10 TW TW089115935A patent/TW466635B/zh not_active IP Right Cessation
-
2002
- 2002-02-11 US US10/073,829 patent/US6669857B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0111673A2 * |
Also Published As
Publication number | Publication date |
---|---|
TW466635B (en) | 2001-12-01 |
US6669857B2 (en) | 2003-12-30 |
CN1252802C (zh) | 2006-04-19 |
CN1399792A (zh) | 2003-02-26 |
KR100463364B1 (ko) | 2004-12-29 |
KR20020027531A (ko) | 2002-04-13 |
WO2001011673A3 (de) | 2001-07-05 |
JP2003506895A (ja) | 2003-02-18 |
WO2001011673A2 (de) | 2001-02-15 |
DE19937503C1 (de) | 2001-01-04 |
US20020130105A1 (en) | 2002-09-19 |
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