EP1358671A2 - Verfahren zur herstellung ferroelektrischer kondensatoren und integrierter halbleiterspeicherbausteine - Google Patents
Verfahren zur herstellung ferroelektrischer kondensatoren und integrierter halbleiterspeicherbausteineInfo
- Publication number
- EP1358671A2 EP1358671A2 EP01990318A EP01990318A EP1358671A2 EP 1358671 A2 EP1358671 A2 EP 1358671A2 EP 01990318 A EP01990318 A EP 01990318A EP 01990318 A EP01990318 A EP 01990318A EP 1358671 A2 EP1358671 A2 EP 1358671A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- adhesive layer
- ferroelectric
- oxygen
- oxygen barrier
- ferroelectric capacitors
- 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- Withdrawn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
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D84/00—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers
- H10D84/80—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers characterised by the integration of at least one component covered by groups H10D12/00 or H10D30/00, e.g. integration of IGFETs
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W20/00—Interconnections in chips, wafers or substrates
- H10W20/01—Manufacture or treatment
- H10W20/031—Manufacture or treatment of conductive parts of the interconnections
- H10W20/032—Manufacture or treatment of conductive parts of the interconnections of conductive barrier, adhesion or liner layers
- H10W20/046—Manufacture or treatment of conductive parts of the interconnections of conductive barrier, adhesion or liner layers the barrier, adhesion or liner layers being associated with interconnections of 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
- H10D1/682—Capacitors having no potential barriers having dielectrics comprising perovskite structures
-
- 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
- H10D1/696—Electrodes comprising multiple layers, e.g. comprising a barrier layer and a metal layer
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W20/00—Interconnections in chips, wafers or substrates
- H10W20/01—Manufacture or treatment
- H10W20/031—Manufacture or treatment of conductive parts of the interconnections
- H10W20/064—Manufacture or treatment of conductive parts of the interconnections by modifying the conductivity of conductive parts, e.g. by alloying
- H10W20/065—Manufacture or treatment of conductive parts of the interconnections by modifying the conductivity of conductive parts, e.g. by alloying by making at least a portion of the conductive part non-conductive, e.g. by oxidation
-
- 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
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.
Landscapes
- Semiconductor Memories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10105997 | 2001-02-09 | ||
| DE10105997A DE10105997C1 (de) | 2001-02-09 | 2001-02-09 | Verfahren zur Herstellung ferroelektrischer Kondensatoren und integrierter Halbleiterspeicherbausteine |
| PCT/DE2001/004790 WO2002065518A2 (de) | 2001-02-09 | 2001-12-18 | Verfahren zur herstellung ferroelektrischer kondensatoren und integrierter halbleiterspeicherbausteine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1358671A2 true EP1358671A2 (de) | 2003-11-05 |
Family
ID=7673463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01990318A Withdrawn EP1358671A2 (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 |
| CN100377357C (zh) * | 2003-10-22 | 2008-03-26 | 松下电器产业株式会社 | 半导体装置及其制造方法 |
| 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 |
Family Cites Families (10)
| 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 |
| TW345723B (en) * | 1996-07-09 | 1998-11-21 | Hitachi Ltd | Semiconductor memory and process for producing the same |
| JP3542704B2 (ja) * | 1997-10-24 | 2004-07-14 | シャープ株式会社 | 半導体メモリ素子 |
| US5930659A (en) * | 1997-12-05 | 1999-07-27 | Advanced Microdevices, Inc. | Forming minimal size spaces in integrated circuit conductive lines |
| US6313539B1 (en) * | 1997-12-24 | 2001-11-06 | Sharp Kabushiki Kaisha | Semiconductor memory device and production method of the same |
| 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 |
| 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 CN CNB018225799A patent/CN1241236C/zh not_active Expired - Fee Related
- 2001-12-18 WO PCT/DE2001/004790 patent/WO2002065518A2/de not_active Ceased
- 2001-12-18 EP EP01990318A patent/EP1358671A2/de not_active Withdrawn
- 2001-12-18 KR KR1020037010399A patent/KR100563783B1/ko not_active Expired - Fee Related
-
2003
- 2003-08-11 US US10/638,594 patent/US6875652B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO02065518A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002065518A3 (de) | 2002-11-21 |
| US6875652B2 (en) | 2005-04-05 |
| CN1489780A (zh) | 2004-04-14 |
| US20040185578A1 (en) | 2004-09-23 |
| JP3886907B2 (ja) | 2007-02-28 |
| CN1241236C (zh) | 2006-02-08 |
| KR20030078074A (ko) | 2003-10-04 |
| DE10105997C1 (de) | 2002-07-25 |
| KR100563783B1 (ko) | 2006-03-27 |
| WO2002065518A2 (de) | 2002-08-22 |
| JP2004518306A (ja) | 2004-06-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20030718 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: KROENKE, MATTHIAS Inventor name: MIKOLAJICK, THOMAS Inventor name: KASKO, IGOR |
|
| 17Q | First examination report despatched |
Effective date: 20060825 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20090701 |