WO2002065518A2 - Verfahren zur herstellung ferroelektrischer kondensatoren und integrierter halbleiterspeicherbausteine - Google Patents
Verfahren zur herstellung ferroelektrischer kondensatoren und integrierter halbleiterspeicherbausteine Download PDFInfo
- Publication number
- WO2002065518A2 WO2002065518A2 PCT/DE2001/004790 DE0104790W WO02065518A2 WO 2002065518 A2 WO2002065518 A2 WO 2002065518A2 DE 0104790 W DE0104790 W DE 0104790W WO 02065518 A2 WO02065518 A2 WO 02065518A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- adhesive layer
- ferroelectric
- oxygen
- oxygen barrier
- ferroelectric capacitors
- Prior art date
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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/7687—Thin films associated with contacts of capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body
- H01L27/10—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration
- H01L27/105—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration including field-effect components
-
- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76886—Modifying permanently or temporarily the pattern or the conductivity of conductive members, e.g. formation of alloys, reduction of contact resistances
- H01L21/76888—By rendering at least a portion of the conductor non conductive, e.g. oxidation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
- H01L28/40—Capacitors
- H01L28/55—Capacitors with a dielectric comprising a perovskite structure material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
- H01L28/40—Capacitors
- H01L28/60—Electrodes
- H01L28/75—Electrodes comprising two or more layers, e.g. comprising a barrier layer and a metal layer
-
- 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
Definitions
- the invention relates to a method for producing ferroelectric capacitors in integrated semiconductor memory chips, according to the preamble of claim 1.
- Such a production method is known from DE 199 26 501 AI.
- a ferroelectric material for example SrBi 2 (Ta, Nb) 2 0 9 (abbreviated SBT or SBTN), Pb (Zr, Ti) 0 3 (abbreviated PZT) or Bi 4 Ti 3 0 ⁇ 2 (abbreviated BTO) used as a dielectric between the electrodes of a capacitor
- the capacitor electrode material is a noble metal or noble metal oxide that withstands high temperatures in 0 2.
- the materials used here are Pt, Pd, Ir, Rh, Ru, RuOx , IrO x , RhO x , SrRu0 3 , SaSrCoO x (LSCO for short), HT superconductor (YBa 2 Cu 3 0 7 ) and others.
- capacitor construction either follows the technologically more sophisticated stack principle or uses a much larger chip area Offset cell principle (see "Integrated Ferroelectrics", 1999, 26, 197 by W. Hartner et al.).
- the DE 199 26 501 AI cited above for the preamble of claim 1 describes that an oxygen barrier is required in order to oxidize the conductive plug made of polysilicon or tungsten, which connects the lower capacitor electrode to a semiconductor electrode or to a metallization path, in the case of the Prevent stack structure built ferroelectric capacitor.
- the z. B. consists of Ir / IrOx, and the plug is formed an adhesive layer that requires lent to keep the contact resistance between the plug and the oxygen barrier low and to prevent possible silicidation of Ir.
- Adhesive layer for the tungsten or polysilicon plug can be used, for example, Ti, TiN, TaSiN, Ta or TaN. Since this adhesive layer must be conductive, it is necessary to structure it, since it would otherwise short-circuit all capacitor modules electrically.
- No. 5,811,181 describes a method for producing a ferroelectric capacitor in which an adhesive layer containing tantalum is deposited.
- the invention is based on the knowledge that during the ferroanneal or tempering process in oxygen, which is carried out after the ferroelectric of the ferroelectric capacitor module has been separated, the adhesive layer oxidizes. It has been shown experimentally that the longer the annealing process takes and the higher the temperature during annealing, the faster the adhesive layer oxidizes. Such experimental studies have also shown that the lateral oxidation under the oxygen barrier takes place more slowly.
- the adhesive layer does not need to be structured, since in the area between the capacitor modules, where it first creates a short circuit, it first oxidizes when the ferroelectric is tempered and thus has an electrically insulating effect.
- this layer can even serve to "getter” oxygen.
- the unstructured adhesive layer also hinders further oxygen diffusion under the oxygen barrier.
- tantalum can be used as the end point signal, for example, when structuring the ferroelectric capacitor module by reactive ion etching of the oxygen barrier / lower capacitor electrode.
- etching can also be carried out selectively, so that the material of the adhesive layer serves as an etching stop. This avoids an additional increase in the topography due to overetching in the intermediate oxide.
- FIG. 1 shows a schematic cross section through a section of an integrated semiconductor memory, the structures of ferroelectric capacitor modules constructed in the stack principle with an unstructured continuous adhesive layer;
- FIG. 2 also shows a schematic cross section through a section of a semiconductor memory to illustrate a tempering step carried out after the deposition of the ferroelectric, in which the exposed areas of the adhesive layer are oxidized and
- FIG. 3 shows a detailed view of a section of a ferroelectric capacitor module shown in a circle III in FIG. 2.
- FIG. 1 shows oxygen barriers 4a, 4b and lower electrode sections 5a, 5b above two ferroelectric capacitor modules 10 and 11.
- the adhesive layer 3 thus lies between the oxygen barriers 4a, 4b, which are intended to prevent oxidation of the polysilicon or tungsten plug la, lb when the ferroelectric capacitors are stacked, and the plugs la, lb and over the entire surface of an intermediate oxide layer 2, which covers the intermediate sections between the conductive ones Plugs la, lb fills.
- the adhesive layer 3 is required to ensure the contact resistance between the plugs la, lb and the associated keep oxygen barrier 4a, 4b low and to prevent possible silicidation of Ir.
- the adhesive layer 3 remains riert unstruc-, that is, it is not selectively where it is exposed from • the oxygen barrier 4a, 4b are removed.
- the adhesive layer 3 as shown in FIG. 2 is oxidized, specifically by oxygen 0 2 (see the hatched arrows in FIG. 2), as it is released for the ferroelectric layer 6a, 6b in an annealing process which is taking place anyway .
- the lower capacitor electrodes 5a, 5b consist of a noble metal or metal oxide that withstands high temperatures in 0 2 .
- they can be used
- the detailed view III shown in FIG. 3 clearly shows that the oxidation process of the adhesive layer 3 continues to below the oxygen barriers 4a, 4b, so that the edges of the oxygen barriers 4a, 4b overlap somewhat with the areas that have been oxidized.
- the manufacturing method according to the invention achieves a ferroelectric semiconductor memory with ferroelectric capacitors constructed according to the stack principle, the structuring of the adhesive layer 3 being spared on the one hand and this layer even being able to getter oxygen on the other hand.
- the Tured adhesive layer 3 the oxygen diffusion under the oxygen barriers 4a, 4b through the adhesive layer.
- the adhesive layer 3 consists of TaSiN or TaN.
- the unstructured material of the adhesive layer 3 can serve as an etching stop. An additional increase in the topography due to overetching into the intermediate oxide 2, which is difficult to avoid, is thereby avoided.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01990318A EP1358671A2 (de) | 2001-02-09 | 2001-12-18 | Verfahren zur herstellung ferroelektrischer kondensatoren und integrierter halbleiterspeicherbausteine |
KR1020037010399A KR100563783B1 (ko) | 2001-02-09 | 2001-12-18 | 강유전 커패시터의 제조 방법 및 집적 반도체 메모리 칩 |
JP2002565350A JP3886907B2 (ja) | 2001-02-09 | 2001-12-18 | 強誘電性キャパシタおよび集積半導体メモリー用チップの製造方法 |
US10/638,594 US6875652B2 (en) | 2001-02-09 | 2003-08-11 | Method for producing ferroelectric capacitors and integrated semiconductor memory chips |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10105997.3 | 2001-02-09 | ||
DE10105997A DE10105997C1 (de) | 2001-02-09 | 2001-02-09 | Verfahren zur Herstellung ferroelektrischer Kondensatoren und integrierter Halbleiterspeicherbausteine |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/638,594 Continuation US6875652B2 (en) | 2001-02-09 | 2003-08-11 | Method for producing ferroelectric capacitors and integrated semiconductor memory chips |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002065518A2 true WO2002065518A2 (de) | 2002-08-22 |
WO2002065518A3 WO2002065518A3 (de) | 2002-11-21 |
Family
ID=7673463
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/004790 WO2002065518A2 (de) | 2001-02-09 | 2001-12-18 | Verfahren zur herstellung ferroelektrischer kondensatoren und integrierter halbleiterspeicherbausteine |
Country Status (7)
Country | Link |
---|---|
US (1) | US6875652B2 (de) |
EP (1) | EP1358671A2 (de) |
JP (1) | JP3886907B2 (de) |
KR (1) | KR100563783B1 (de) |
CN (1) | CN1241236C (de) |
DE (1) | DE10105997C1 (de) |
WO (1) | WO2002065518A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10334124A1 (de) * | 2003-07-25 | 2005-02-17 | Infineon Technologies Ag | Haftung von Strukturen aus schlecht haftenden Materialien |
US20050087788A1 (en) * | 2003-10-22 | 2005-04-28 | Matsushita Electric Industrial Co., Ltd. | Semiconductor device and method for fabricating the same |
WO2008072827A1 (en) * | 2006-12-15 | 2008-06-19 | University Of Seoul Foundation Of Industry-Academic Cooperation | Ferroelectric material and method of forming ferroelectric layer using the same |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0911871A2 (de) * | 1997-10-24 | 1999-04-28 | Sharp Kabushiki Kaisha | Halbleiter-Speicherbauteil mit ferroelektrischem Dünnfilm |
EP0920054A1 (de) * | 1996-07-09 | 1999-06-02 | Hitachi, Ltd. | Halbleiterspeicher und deren herstellungsverfahren |
US5930659A (en) * | 1997-12-05 | 1999-07-27 | Advanced Microdevices, Inc. | Forming minimal size spaces in integrated circuit conductive lines |
DE19926501A1 (de) * | 1999-06-10 | 2000-12-21 | Siemens Ag | Verfahren zur Herstellung eines Halbleiterspeicherbauelements |
US6168991B1 (en) * | 1999-06-25 | 2001-01-02 | Lucent Technologies Inc. | DRAM capacitor including Cu plug and Ta barrier and method of forming |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3476932B2 (ja) * | 1994-12-06 | 2003-12-10 | シャープ株式会社 | 強誘電体薄膜及び強誘電体薄膜被覆基板並びに強誘電体薄膜の製造方法 |
US6313539B1 (en) * | 1997-12-24 | 2001-11-06 | Sharp Kabushiki Kaisha | Semiconductor memory device and production method of the same |
US6455424B1 (en) * | 2000-08-07 | 2002-09-24 | Micron Technology, Inc. | Selective cap layers over recessed polysilicon plugs |
JP2002076298A (ja) * | 2000-08-23 | 2002-03-15 | Matsushita Electric Ind Co Ltd | 半導体記憶装置およびその製造方法 |
KR100391987B1 (ko) * | 2000-09-18 | 2003-07-22 | 삼성전자주식회사 | 강유전체 캐퍼시터를 갖는 반도체 장치 및 그 제조방법 |
-
2001
- 2001-02-09 DE DE10105997A patent/DE10105997C1/de not_active Expired - Fee Related
- 2001-12-18 JP JP2002565350A patent/JP3886907B2/ja not_active Expired - Fee Related
- 2001-12-18 KR KR1020037010399A patent/KR100563783B1/ko not_active IP Right Cessation
- 2001-12-18 CN CNB018225799A patent/CN1241236C/zh not_active Expired - Fee Related
- 2001-12-18 WO PCT/DE2001/004790 patent/WO2002065518A2/de active IP Right Grant
- 2001-12-18 EP EP01990318A patent/EP1358671A2/de not_active Withdrawn
-
2003
- 2003-08-11 US US10/638,594 patent/US6875652B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0920054A1 (de) * | 1996-07-09 | 1999-06-02 | Hitachi, Ltd. | Halbleiterspeicher und deren herstellungsverfahren |
EP0911871A2 (de) * | 1997-10-24 | 1999-04-28 | Sharp Kabushiki Kaisha | Halbleiter-Speicherbauteil mit ferroelektrischem Dünnfilm |
US5930659A (en) * | 1997-12-05 | 1999-07-27 | Advanced Microdevices, Inc. | Forming minimal size spaces in integrated circuit conductive lines |
DE19926501A1 (de) * | 1999-06-10 | 2000-12-21 | Siemens Ag | Verfahren zur Herstellung eines Halbleiterspeicherbauelements |
US6168991B1 (en) * | 1999-06-25 | 2001-01-02 | Lucent Technologies Inc. | DRAM capacitor including Cu plug and Ta barrier and method of forming |
Also Published As
Publication number | Publication date |
---|---|
DE10105997C1 (de) | 2002-07-25 |
EP1358671A2 (de) | 2003-11-05 |
KR20030078074A (ko) | 2003-10-04 |
JP3886907B2 (ja) | 2007-02-28 |
WO2002065518A3 (de) | 2002-11-21 |
CN1241236C (zh) | 2006-02-08 |
JP2004518306A (ja) | 2004-06-17 |
CN1489780A (zh) | 2004-04-14 |
US20040185578A1 (en) | 2004-09-23 |
US6875652B2 (en) | 2005-04-05 |
KR100563783B1 (ko) | 2006-03-27 |
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