EP1186044A1 - Speicherzellenanordnung und verfahren zu deren herstellung - Google Patents
Speicherzellenanordnung und verfahren zu deren herstellungInfo
- Publication number
- EP1186044A1 EP1186044A1 EP00926688A EP00926688A EP1186044A1 EP 1186044 A1 EP1186044 A1 EP 1186044A1 EP 00926688 A EP00926688 A EP 00926688A EP 00926688 A EP00926688 A EP 00926688A EP 1186044 A1 EP1186044 A1 EP 1186044A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- contact
- produced
- capacitor
- memory cell
- 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- Withdrawn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
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000758 substrate Substances 0.000 claims abstract description 62
- 239000003990 capacitor Substances 0.000 claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000011810 insulating material Substances 0.000 claims description 9
- 239000004020 conductor Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 39
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 12
- 229920005591 polysilicon Polymers 0.000 description 12
- 229910052581 Si3N4 Inorganic materials 0.000 description 11
- 229910004298 SiO 2 Inorganic materials 0.000 description 11
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 11
- 238000005498 polishing Methods 0.000 description 9
- 229920002120 photoresistant polymer Polymers 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 239000011241 protective layer Substances 0.000 description 6
- 238000005530 etching Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 238000000151 deposition Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- WQJQOUPTWCFRMM-UHFFFAOYSA-N tungsten disilicide Chemical compound [Si]#[W]#[Si] WQJQOUPTWCFRMM-UHFFFAOYSA-N 0.000 description 3
- 229910021342 tungsten silicide Inorganic materials 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- -1 tungsten nitride Chemical class 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910052454 barium strontium titanate Inorganic materials 0.000 description 1
- 239000005380 borophosphosilicate glass Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/01—Manufacture or treatment
- H10B12/02—Manufacture or treatment for one transistor one-capacitor [1T-1C] memory cells
- H10B12/03—Making the capacitor or connections thereto
- H10B12/038—Making the capacitor or connections thereto the capacitor being in a trench in the substrate
- H10B12/0383—Making the capacitor or connections thereto the capacitor being in a trench in the substrate wherein the transistor is vertical
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/01—Manufacture or treatment
- H10B12/02—Manufacture or treatment for one transistor one-capacitor [1T-1C] memory cells
- H10B12/03—Making the capacitor or connections thereto
- H10B12/038—Making the capacitor or connections thereto the capacitor being in a trench in the substrate
- H10B12/0385—Making a connection between the transistor and the capacitor, e.g. buried strap
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/01—Manufacture or treatment
- H10B12/02—Manufacture or treatment for one transistor one-capacitor [1T-1C] memory cells
- H10B12/03—Making the capacitor or connections thereto
- H10B12/038—Making the capacitor or connections thereto the capacitor being in a trench in the substrate
- H10B12/0387—Making the trench
Definitions
- the invention relates to a memory cell arrangement and method for its production.
- the memory cell arrangement generated by the method is a DRAM cell arrangement, that is to say a memory cell arrangement with dynamic random access.
- a memory cell of the memory cell arrangement comprises a transistor and a capacitor, on which the information of the memory cell is stored in the form of a charge.
- the capacitor is connected to the transistor in such a way that when the transistor is driven via a word line, the charge on the capacitor can be read out via a bit line.
- the planar transistor and above that the capacitor are produced on a first surface of a substrate. BPSG is deposited and polished over the capacitor so that a planar surface is created. On this surface the substrate is covered with a
- Carrier substrate connected. A second surface of the substrate opposite the first surface is then removed until an insulating structure that surrounds the transistor is exposed. After thermal oxidation, insulating material is deposited. A contact hole to a source / drain region of the transistor is created in the insulating material. A bit line is created on the insulating material. Part of the bit line is arranged in the contact hole and adjoins the source / drain region.
- Memory cell arrangement in which a MOS transistor of a memory cell and a bit line connected to it are arranged on a first surface of a substrate.
- a capacitor of the memory cell is arranged on a second surface of the substrate opposite the first surface.
- a contact arranged in the substrate connects the capacitor to the MOS transistor.
- the problem is further solved by a method for producing a memory cell arrangement, in which a MOS transistor of a memory cell and a bit line connected to it are produced on a first surface of a substrate. A second surface of the substrate opposite the first surface is removed. A capacitor of the memory cell is produced on the second surface. A contact is created in the substrate, which connects the capacitor to the MOS transistor.
- the influence of the method for producing the capacitor on the MOS transistor is slight because the MOS transistor is arranged on a different side of the substrate than the capacitor.
- the invention consequently allows many freedom for the production of the capacitors, for example with regard to the choice of materials and the choice of process steps. Process reliability is increased compared to the prior art.
- the memory cell arrangement can consequently be produced with a high packing density.
- Capacitor dielectric is arranged as large as possible. In order for the packing density of the DRAM cell arrangement to be as large as possible, the space requirement of the capacitor is as small as possible.
- Capacitor dielectric preferably one
- the capacitor dielectric consists of a ferroelectric, e.g. Barium strontium titanate, or from
- the contact connects a first source / drain region of the MOS transistor to the capacitor electrode of the capacitor.
- a second source / drain region of the MOS transistor is connected to a bit line.
- a gate electrode of the MOS transistor is connected to a word line which runs transverse to the bit line.
- the bit line can run, for example, over the first surface of the substrate.
- the MOS transistor can be designed as a planar transistor. To increase the packing density of the memory cell arrangement, the MOS transistor is preferably produced as a vertical transistor.
- the first source / drain region is arranged, for example, under the second source / drain region. The first source / drain region can laterally adjoin the contact.
- a contact hole is preferably produced in the first surface.
- conductive material is deposited and etched back in such a way that the contact hole is not completely filled.
- the depth of an upper surface of the contact is dimensioned such that the contact adjoins the first source / drain region, which can be part of the substrate and is arranged under the second source / drain region.
- the contact hole is provided with an insulation before the contact is made, so that the contact is insulated from the rest of the substrate.
- a gate electrode of the MOS transistor which is insulated from the contact and substrate, is produced in the contact hole.
- the second source / drain region is also produced as part of the substrate and is laterally adjacent to the contact hole.
- the gate electrode is produced in a recess in the substrate which is different from the contact hole.
- the contact preferably protrudes from the second surface of the substrate.
- a short circuit between the substrate and the contact during the generation of the capacitor electrode can be avoided particularly easily by depositing and removing insulating material until the contact is exposed.
- the substrate is then covered with the insulating material, and the capacitor electrode can be formed on the insulating material and on the contact without being adjacent to the substrate.
- the contact is selectively etched to the substrate so that a recess is produced.
- the recess is filled with an auxiliary structure so that the auxiliary structure covers the contact.
- material is deposited and removed until the substrate is exposed.
- the substrate is then selectively etched to the auxiliary structure, so that the auxiliary structure and part of the contact protrude.
- the insulating material can now be deposited and removed together with the auxiliary structure until the auxiliary structure is removed and consequently the contact is exposed.
- the insulating material and a surface of the contact form a planar surface. At the same time, the contact protrudes beyond the second surface of the substrate.
- the substrate can consist of silicon.
- the contact can consist of doped polysilicon.
- a solution of HF, HNO3 and CH3COOH, for example, is suitable as an etchant for selectively etching the contact.
- FIG. 1 shows a cross section through a substrate after a first layer, a second layer, a third layer, a fourth layer and separating structures have been produced.
- FIG. 2 shows the cross section from FIG. 1 after the fourth layer has been removed and first auxiliary structures have been produced.
- FIG. 3 shows a cross section through the substrate perpendicular to the cross section from FIG. 2, after contact holes, insulation, upper source / drain regions of transistors and contacts have been produced.
- FIG. 4 shows the cross section from FIG. 3 after a gate dielectric, lower source / drain regions, word lines, a protective layer, spacers, a first insulating layer (not shown), bit lines and a second insulating layer have been produced.
- FIG. 5 shows the cross section from FIG. 4 after the contacts have been exposed and depressions and auxiliary structures have been produced.
- FIG. 6 shows the cross section from FIG. 5 after a third insulating layer has been produced and the auxiliary structures have been removed.
- Figure 7 shows the cross section of Figure 6 after a
- Capacitor electrode, a capacitor dielectric and a capacitor plate of capacitors were generated.
- a p-doped substrate S made of silicon is provided as the starting material, which is p-doped in a layer adjacent to a first surface 01 of the substrate S with a dopant concentration of approximately 10 8 cm -3.
- An approximately 20 nm thick first layer of SiO 2 is produced on the first surface 01 by thermal oxidation.
- An approx. 100 nm thick second layer of silicon nitride is placed on top, a CVD process is used to cover an approx. 800 nm thick third layer 3 of SiO 2 and an approx. 100 nm thick fourth layer 4 deposited from silicon nitride (see Figure 1).
- the fourth layer 4, the third layer 3, the second layer 2, the first layer 1 and the substrate S are etched anisotropically, so that first trenches approximately 300 nm deep in the substrate S. are generated that have a width of about 100 nm and distances of about 100 nm from each other.
- Suitable etching agents are, for example, CF 4 , CHF 3 , CF 6 and HBr, which are combined in accordance with the material to be etched.
- Separating structures T are produced in the first trenches in that SiO 2 conformally is deposited to a thickness of approximately 200 nm and is planarized by chemical mechanical polishing until an upper surface of the fourth layer 4 is exposed. SiO 2 is then selectively etched back to silicon nitride until an upper surface of the separating structures T lies below an upper surface of the third layer 3 (see FIG. 1).
- Silicon nitride is then deposited and planarized by chemical mechanical polishing until the upper surface of the third layer 3 is exposed. In this way, first auxiliary structures Q are produced from the silicon nitride above the separating structures T (see FIG. 2).
- the stripes of which run transversely to the stripes of the first photoresist mask are approximately 100 nm wide and are at intervals of approximately 100 nm
- SiO 2 is selectively etched to silicon nitride with, for example, C4F5, CO, until the second layer 2 is partially exposed. Silicon nitride is then etched, so that the first auxiliary structures Q and exposed parts of the second layer 2 are removed.
- the first is due to the finite selectivity of the etching process
- Layer 1 is partially severed and contact holes L are then produced.
- the separating structures T and the third layer 3 act as a thick mask.
- the contact holes L are approximately 5000 nm deep (see FIG. 3).
- the contact holes L are provided with an approximately 15 nm thick insulation I by thermal oxidation (see FIG. 3).
- in-situ doped polysilicon is deposited to a thickness of approximately 50 nm and planarized by chemical mechanical polishing until the second layer 2 is exposed.
- the third layer 3 is removed and the separating structures T are removed somewhat.
- the polysilicon is etched back to a depth of approx. 470 nm.
- in situ doped polysilicon with a thickness of approx. 50 nm is deposited and planarized by chemical-mechanical polishing until the second layer 2 is exposed.
- upper source / dram regions S / D2 of vertical transistors approximately 30 nm thick are produced by implantation with n-doping ions in the substrate S (see FIG. 3). Because of the separating structures T and the contact holes L, the upper source / dram regions S / D2 have square horizontal cross sections with a side length of approximately 100 nm. Upper source / dram regions S / D2 which are adjacent to one another are separated from one another by the separating structures T or by the contact holes L.
- the polysilicon is then etched back to a depth of approximately 300 nm below the first surface 01, so that contacts K are produced in the contact holes L, which contact the adjoin the first flanks of the contact holes L to the substrate S (see FIG. 3).
- the second layer 2 is then removed using, for example, hot phosphoric acid.
- a gate dielectric Gd is generated on the first flanks of the contact holes L by thermal oxidation.
- the gate dielectric Gd also covers the contacts K (see FIG. 4).
- the thermal oxidation acts as a tempering step, through which the dopant diffuses from the contacts K into the substrate S and forms lower source / drain regions S / D1 of the transistors there (see FIG. 4).
- Polysilicon is then doped in situ in one
- Tungsten silicide is deposited in a thickness of approx. 50 nm.
- protective layer 5 made of silicon nitride is deposited.
- the protective layer 5, tungsten silicide and polysilicon are etched using a strip-shaped fourth photoresist mask (not shown), the strips of which run transversely to the separating structures T, until the gate dielectric Gd is exposed.
- Word lines W are thereby formed from the tungsten silicide and the polysilicon and are covered by the protective layer S (see FIG. 4).
- the word lines W are approximately 100 nm wide and are at a distance of approximately 100 nm from one another.
- the word lines W are arranged offset to the contact holes L, so that first parts of the word lines W have a strip-shaped horizontal cross section and run over parts of the upper source / drain regions S / D2 covered by the first layer 1.
- Second parts of the word lines W are arranged in the contact holes L on their first flanks.
- SiO 2 is deposited to a thickness of approximately 50 nm and etched back until the first layer 1, which is more difficult to etch due to its density, is exposed.
- spacers Sp are produced by depositing silicon nitride in a thickness of approximately 15 nm and etching back anisotropically (see FIG. 4).
- SiO 2 is deposited and planarized by chemical mechanical polishing until a flat surface is formed.
- SiO 2 is etched until the upper source / drain regions S / D2 are exposed and second trenches are produced in the first insulating layer, which are formed in Areas between the word lines W are particularly deep. Parts of the gate dielectric Gd are removed. The protective layer 5 and the spacers Sp protect the word lines W.
- in situ doped polysilicon is first deposited to a thickness of approximately 50 nm and etched back until approximately 30 nm of polysilicon lies over the protective layer 5. Then titanium and titanium nitride are deposited in a thickness of approx. 20 nm and tungsten in a thickness of approx. 60 nm and planarized by chemical-mechanical polishing until the first insulating layer is exposed, so that self-aligned in the second trenches from the tungsten , the Titan, the
- Titanium nitride and the polysilicon bit lines B are generated (see Figure 4). Form first parts of bit lines B. Stripes that run across the word lines W and second parts of the bit lines B are arranged between adjacent word lines W and adjoin the upper source / drain regions S / D2.
- SiO 2 is deposited and chemically-mechanically polished until the second insulating layer 12 has a planar surface (see FIG. 4).
- the substrate S is connected to a carrier substrate (not shown) such that the bit lines B are arranged between the substrate S and the carrier substrate.
- a second surface 02 of the substrate, opposite the first surface 01, is removed by chemical mechanical polishing until the contacts K are exposed.
- polysilicon is etched selectively to silicon to a depth of approximately 30 nm, so that depressions V are produced.
- the depressions V are filled with further auxiliary structures H by depositing silicon nitride in a thickness of approximately 50 nm and planarizing by chemical mechanical polishing until the substrate S is exposed (see FIG. 5).
- the substrate S is then selectively etched back to silicon nitride to a depth of approximately 60 nm, so that the auxiliary structures H and parts of the contacts K protrude.
- SiO 2 is deposited to a thickness of approximately 50 nm and planarized by chemical mechanical polishing until the auxiliary structures H are removed and the contacts K are exposed (see FIG. 6).
- tungsten nitride is deposited in a thickness of approximately 100 nm and structured with the aid of a sixth photoresist mask in such a way that cylindrical capacitor electrodes P1 are produced from the tungsten nitride by capacitors which adjoin the contacts K (see FIG. 7).
- TiN is deposited in a thickness of approximately 100 nm, so that a capacitor plate P2 is produced over the capacitor dielectric Kd, which serves as a common further capacitor electrode of the capacitors (see FIG. 7).
- a DRAM cell arrangement is generated.
- a memory cell includes one of the vertical transistors and one of the capacitors connected in series with the transistor.
- Channel regions of the transistors are parts of the substrate S which are arranged between the upper source / drain regions S / D2 and the lower source / drain regions S / D1.
- Metallization levels can be generated in the second insulating layer 12.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Semiconductor Memories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19914496A DE19914496A1 (de) | 1999-03-30 | 1999-03-30 | Speicherzellenanordnung und Verfahren zu deren Herstellung |
DE19914496 | 1999-03-30 | ||
PCT/DE2000/000906 WO2000060666A1 (de) | 1999-03-30 | 2000-03-24 | Speicherzellenanordnung und verfahren zu deren herstellung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1186044A1 true EP1186044A1 (de) | 2002-03-13 |
Family
ID=7903001
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00926688A Withdrawn EP1186044A1 (de) | 1999-03-30 | 2000-03-24 | Speicherzellenanordnung und verfahren zu deren herstellung |
Country Status (7)
Country | Link |
---|---|
US (1) | US6518613B2 (de) |
EP (1) | EP1186044A1 (de) |
JP (1) | JP3961223B2 (de) |
KR (1) | KR100458988B1 (de) |
DE (1) | DE19914496A1 (de) |
TW (1) | TW479351B (de) |
WO (1) | WO2000060666A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10111760B4 (de) * | 2001-03-12 | 2004-08-12 | Infineon Technologies Ag | Verfahren zur Herstellung von mindestens zwei Speicherzellen eines Halbleiterspeichers |
DE10227605A1 (de) * | 2002-06-20 | 2004-01-15 | Infineon Technologies Ag | Schicht-Anordnung und Verfahren zum Herstellen einer Schicht-Anordnung |
DE10232001A1 (de) * | 2002-07-15 | 2004-02-05 | Infineon Technologies Ag | Verfahren zur Herstellung eines integrierten Halbleiterspeichers |
DE10232002B4 (de) | 2002-07-15 | 2008-12-11 | Qimonda Ag | Verfahren zur selbstjustierten selektiven Kontaktierung von Gate-Elektroden vertikaler Transistoren eines integrierten Halbleiterspeichers und integrierter Halbleiterspeicher |
US6753239B1 (en) | 2003-04-04 | 2004-06-22 | Xilinx, Inc. | Bond and back side etchback transistor fabrication process |
US6864156B1 (en) | 2003-04-04 | 2005-03-08 | Xilinx, Inc. | Semiconductor wafer with well contacts on back side |
JP2012174790A (ja) * | 2011-02-18 | 2012-09-10 | Elpida Memory Inc | 半導体装置及びその製造方法 |
CN112071841A (zh) * | 2020-09-17 | 2020-12-11 | 芯盟科技有限公司 | 半导体结构及其形成方法 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR900008647B1 (ko) * | 1986-03-20 | 1990-11-26 | 후지쓰 가부시끼가이샤 | 3차원 집적회로와 그의 제조방법 |
JPH01146354A (ja) * | 1987-12-02 | 1989-06-08 | Mitsubishi Electric Corp | 半導体記憶装置 |
JPH01253956A (ja) * | 1988-04-04 | 1989-10-11 | Nippon Telegr & Teleph Corp <Ntt> | 半導体記憶装置及びその製法 |
US5087581A (en) * | 1990-10-31 | 1992-02-11 | Texas Instruments Incorporated | Method of forming vertical FET device with low gate to source overlap capacitance |
JPH0645550A (ja) * | 1992-07-23 | 1994-02-18 | Matsushita Electron Corp | 半導体装置 |
KR0123751B1 (ko) * | 1993-10-07 | 1997-11-25 | 김광호 | 반도체장치 및 그 제조방법 |
US5554870A (en) * | 1994-02-04 | 1996-09-10 | Motorola, Inc. | Integrated circuit having both vertical and horizontal devices and process for making the same |
KR0135803B1 (ko) * | 1994-05-13 | 1998-04-24 | 김광호 | 상.하로 분리된 커패시터를 갖는 반도체 메모리장치 및 그 제조방법 |
US6043527A (en) * | 1998-04-14 | 2000-03-28 | Micron Technology, Inc. | Circuits and methods for a memory cell with a trench plate trench capacitor and a vertical bipolar read device |
-
1999
- 1999-03-30 DE DE19914496A patent/DE19914496A1/de not_active Withdrawn
-
2000
- 2000-03-24 KR KR10-2001-7012139A patent/KR100458988B1/ko not_active IP Right Cessation
- 2000-03-24 JP JP2000610066A patent/JP3961223B2/ja not_active Expired - Fee Related
- 2000-03-24 WO PCT/DE2000/000906 patent/WO2000060666A1/de active IP Right Grant
- 2000-03-24 EP EP00926688A patent/EP1186044A1/de not_active Withdrawn
- 2000-03-27 TW TW089105587A patent/TW479351B/zh not_active IP Right Cessation
-
2001
- 2001-10-01 US US09/968,304 patent/US6518613B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0060666A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR100458988B1 (ko) | 2004-12-03 |
US6518613B2 (en) | 2003-02-11 |
WO2000060666A1 (de) | 2000-10-12 |
TW479351B (en) | 2002-03-11 |
JP3961223B2 (ja) | 2007-08-22 |
JP2002541666A (ja) | 2002-12-03 |
DE19914496A1 (de) | 2000-10-05 |
KR20010110684A (ko) | 2001-12-13 |
US20020071320A1 (en) | 2002-06-13 |
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