KR950021638A - Storage electrode formation method of DRAM cell - Google Patents

Storage electrode formation method of DRAM cell Download PDF

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Publication number
KR950021638A
KR950021638A KR1019930031865A KR930031865A KR950021638A KR 950021638 A KR950021638 A KR 950021638A KR 1019930031865 A KR1019930031865 A KR 1019930031865A KR 930031865 A KR930031865 A KR 930031865A KR 950021638 A KR950021638 A KR 950021638A
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KR
South Korea
Prior art keywords
storage electrode
forming
oxide film
conductive layer
etching
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Application number
KR1019930031865A
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Korean (ko)
Inventor
우상호
Original Assignee
김주용
현대전자산업 주식회사
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Application filed by 김주용, 현대전자산업 주식회사 filed Critical 김주용
Priority to KR1019930031865A priority Critical patent/KR950021638A/en
Publication of KR950021638A publication Critical patent/KR950021638A/en

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L28/00Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
    • H01L28/40Capacitors
    • H01L28/60Electrodes
    • H01L28/82Electrodes with an enlarged surface, e.g. formed by texturisation
    • H01L28/90Electrodes with an enlarged surface, e.g. formed by texturisation having vertical extensions
    • H01L28/91Electrodes with an enlarged surface, e.g. formed by texturisation having vertical extensions made by depositing layers, e.g. by depositing alternating conductive and insulating layers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L28/00Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
    • H01L28/40Capacitors
    • H01L28/60Electrodes
    • H01L28/75Electrodes comprising two or more layers, e.g. comprising a barrier layer and a metal layer

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Semiconductor Memories (AREA)

Abstract

본 발명은 디램셀(DRAM cell)의 저장전극 형성방법에 관한 것으로, 불순물이 도핑된 다결정실리콘과 도핑되지 않은 다결정실리콘의 습식식각선택비를 이용하여 여러개의 실린더를 갖는 구조로 저장전극의 용량을 향상시키고, 상기 저장전극의 하부에 존재하는 산화막을 보호할 수 있는 기술이다.The present invention relates to a method of forming a storage electrode of a DRAM cell, and has a structure having a plurality of cylinders by using a wet etch selectivity of doped polycrystalline silicon and undoped polycrystalline silicon. It is a technique capable of improving and protecting the oxide film existing under the storage electrode.

Description

디램셀의 저장전극 형성방법Storage electrode formation method of DRAM cell

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도 내지 제7도는 본 발명의 실시예로 디램셀의 저장전극 형성공정을 도시한 단면도.1 to 7 are cross-sectional views illustrating a storage electrode forming process of a DRAM cell according to an embodiment of the present invention.

Claims (7)

일반적인 MOS 구조에서 디램셀을 형성함에 있어서, 예정된 부위에 필드산화막, 활성영역, 워드라인, 소오스/드레인 영역 및 비트라인을 형성시킨 후, 평탄화된 표면 상부에 전하저장전극이 형성될 부위에 저장전극 콘택홀을 형성하는 공정과, 불순물이 도핑된 다결정실리콘막으로 제1도전층을 형성하는 공정과, 상기 제1도전층의 상부에 제1산화막을 증착하는 공정과, 전체구조상부에 저장전극 마스크용 감광막패턴을 형성하고 상기 감광막패턴을 사용하여 제1산화막을 식각하여 제1산화막패턴을 형성한 다음, 상기 감광막패턴을 제거하는 공정과, 상기 제1산화막패턴을 마스크로 하여 제1도전층의 일부만을 식각하고 제1산화막을 제거하는 공정과, 전체구조상부에 제2산화막을 일정두께 증착하는 공정과, 상기 제2산화막을 이방성식각하여 산화막 스페이서를 형성하는 공정과, 상기 산화막 스페이서를 마스크로 하여 하부의 제1도전층을 식각하여 한개의 실린더 구조를 갖는 실린더형 저장전극을 형성하는 공정과, 상기 실린더형 저장전극을 포함한 전체상부구조에 불순물이 도핑되지 않은 다결정실리콘막을 제2도전층으로 증착하는 공정과, 전체상부구조를 이방성식각하여 다결정실리콘 스페이서를 형성하는 공정과, 습식방법으로 상기 산화막 스페이서를 제거한 다음, 다결정실리콘 습식식각 용액을 사용하여 불순물이 도핑되어 있는 제1도전층의 기둥부만을 식각함으로써 고축전이 가능한 이중실린더형 저장전극을 형성하는 공정을 포함하는 디램셀의 저장전극 형성방법.In forming a DRAM cell in a general MOS structure, after forming a field oxide film, an active region, a word line, a source / drain region and a bit line in a predetermined region, a storage electrode is formed in a region where a charge storage electrode is to be formed on the planarized surface. Forming a contact hole, forming a first conductive layer with an impurity doped polysilicon film, depositing a first oxide film on top of the first conductive layer, and storing a storage electrode mask over the entire structure Forming a photoresist pattern and etching the first oxide film using the photoresist pattern to form a first oxide pattern, and then removing the photoresist pattern, and using the first oxide pattern as a mask, Etching only a portion and removing the first oxide film, depositing a second oxide film on the entire structure to a predetermined thickness, and anisotropically etching the second oxide film And forming a cylindrical storage electrode having a single cylinder structure by etching the lower first conductive layer using the oxide spacer as a mask, and an impurity in the entire upper structure including the cylindrical storage electrode. Depositing the undoped polysilicon film as a second conductive layer, anisotropically etching the entire upper structure to form a polysilicon spacer, removing the oxide spacer by a wet method, and then using a polysilicon wet etching solution. Forming a double-cylinder type storage electrode capable of high power storage by etching only the pillar portion of the first conductive layer doped with impurities. 제1항에 있어서, 상기 제1산화막은 그 두께를 500Å-1000Å으로 하는 것을 특징으로 하는 디램셀의 저장전극 형성방법.The method of claim 1, wherein the first oxide film has a thickness of 500 mW-1000 mW. 제1항에 있어서, 상기 제1도전층 식각시 그 두께는 1000Å-2000Å으로 하는 것을 특징으로 하는 디램셀의 저장전극 형성방법.2. The method of claim 1, wherein the first conductive layer is etched in a thickness of 1000 ns to 2000 ns. 제1항에 있어서, 상기 제2산화막은 그 두께를 1000Å-2000Å으로 하는 것을 특징으로 하는 디램셀의 저장전극 형성방법.The method of claim 1, wherein the second oxide film has a thickness of 1000 mW-2000 mW. 제1항에 있어서, 상기 제2도전층 식각시 그 두께는 500Å-2000Å으로 하는 것을 특징으로 하는 디램셀의 저장전극 형성방법.The method of claim 1, wherein the second conductive layer is etched at a thickness of 500 ns to 2000 ns. 제1항에 있어서, 상기 다결정실리콘 습식식각용액은 질산, 초산, 불산 및 D·I로 형성된 것을 사용하며 도프된 다결정실리콘과 도프되지 않은 다결정실리콘의 식각선택비가 30-60:1이 되도록 하는 것을 특징으로 하는 디램셀의 저장전극 형성방법.The method of claim 1, wherein the polysilicon wet etching solution is formed of nitric acid, acetic acid, hydrofluoric acid and D-I, and the etch selectivity of the doped polycrystalline silicon and undoped polycrystalline silicon is 30-60: 1 A storage electrode forming method of a DRAM cell. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930031865A 1993-12-31 1993-12-31 Storage electrode formation method of DRAM cell KR950021638A (en)

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KR1019930031865A KR950021638A (en) 1993-12-31 1993-12-31 Storage electrode formation method of DRAM cell

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KR1019930031865A KR950021638A (en) 1993-12-31 1993-12-31 Storage electrode formation method of DRAM cell

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