KR970063755A - Flash memory cell, method of manufacturing the same, - Google Patents

Flash memory cell, method of manufacturing the same, Download PDF

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Publication number
KR970063755A
KR970063755A KR1019960004697A KR19960004697A KR970063755A KR 970063755 A KR970063755 A KR 970063755A KR 1019960004697 A KR1019960004697 A KR 1019960004697A KR 19960004697 A KR19960004697 A KR 19960004697A KR 970063755 A KR970063755 A KR 970063755A
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string selection
gate
selection transistor
depletion
memory cell
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KR1019960004697A
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Korean (ko)
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KR100219475B1 (en
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최정혁
신왕철
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김광호
삼성전자 주식회사
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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10BELECTRONIC MEMORY DEVICES
    • H10B41/00Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
    • H10B41/30Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region
    • H10B41/35Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region with a cell select transistor, e.g. NAND
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture 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
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/768Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
    • H01L21/76801Applying 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 dielectrics, e.g. smoothing

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Semiconductor Memories (AREA)
  • Non-Volatile Memory (AREA)
  • Read Only Memory (AREA)

Abstract

공유된 비트라인 셀에서의 리드(read) 전류를 개선시킬 수 있는 플래쉬 메모리 셀 및 그 동작방법이 개시된다. 본 발명은 공핍형 스트링 선택트랜지스터의 게이트 산화막의 두께를 증가형 스트링 선택트랜지스터의 게이트 산화막의 두께보다 감소시킴으로써, 종래 공유된 비트라인 셀에서의 문제점인 공정 마스크의 추가와 고집적화에 따른 스트링 선택트랜지스터를 통한 리드 전류의 감소 문제를 해결할 수 있다. 또한, 공유된 비트라인 셀에서 스트링 선택트랜지스터에 인가되는 리드전압을 Vcc와 0V에서 Vcc이상과 0V 이상으로 동작시킴으로써 셀 스트링 전류의 증가를 도모할 수 있다.A flash memory cell capable of improving the read current in a shared bit line cell and an operation method thereof are disclosed. The present invention reduces the thickness of the gate oxide layer of the depletion type string selection transistor to the thickness of the gate oxide of the enhancement type string selection transistor, It is possible to solve the problem of the reduction of the lead current. Further, the cell string current can be increased by operating the read voltage applied to the string selection transistor in the shared bit line cell from Vcc and 0 V to Vcc or more and 0 V or more.

Description

플래쉬 메모리 셀과 그 제조방법 및 동작방법.Flash memory cell, fabrication method and operating method thereof.

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제11도는 제10도의 등가회로도FIG. 11 is an equivalent circuit diagram of FIG.

Claims (8)

직렬 접속된 한쌍의 트랜지스터들로 이루어진 다수의 데이타 기억용 메모리 셀들, 이들 셀 가운데 적어도 어느 하나의 특정 셀을 선택하기 위해 공핍형 및 증가형 트랜지스터가 직렬 접속된 2개의 스트링 선택라인, 및 접지선택 트랜지스터가 접속된 접지선택 라인이 비트라인과 소오스라인 사이에 서로 직렬회로로 구성되어 하나의 단위 스트링(string)을 구성하며, 상기 이웃한 단위 스트링들이 하나의 비트라인 콘택을 공유하는 공유된 비트라인 셀에 있어서, 상기 동일한 스트링 선택라인을 통해 연결된 공핍형 스트링 선택트랜지스터의 게이트 절연막이 증가형 스트링 선택트랜지스터의 게이트 절연막의 두께보다 더 얇게 형성된 것을 특징으로 하는 플래쉬 메모리 셀.A plurality of data storage memory cells consisting of a pair of transistors connected in series, two string selection lines in which depletion and anisotropic transistors are connected in series to select at least one specific cell among these cells, A ground selection line connected to the bit line and the source line is constituted by a series circuit between the bit line and the source line to constitute a unit string and the neighboring unit strings form a shared bit line cell Wherein the gate insulating film of the depletion type string selection transistor connected through the same string selection line is formed to be thinner than the thickness of the gate insulating film of the enhancement type string selection transistor. 제1항에 있어서, 상기 공핍형 스트링 선택트랜지스터의 게이트 절연막은 양자역학적 터널링이 가능한 두께를 갖는 터널산화막(tunnel oxide)으로 이루어진 것을 특징으로 하는 플래쉬 메모리 셀.The flash memory cell of claim 1, wherein the gate insulating layer of the depletion-type string selection transistor is formed of a tunnel oxide having a thickness capable of quantum tunneling. 제1항에 있어서, 상기 메모리 셀 트랜지스터의 게이트 산화막의 두께는 상기 공핍형 스트링 선택트랜지스터의 게이트 산화막의 두께와 동일하게 구성된 것을 특징으로 하는 플래쉬 메모리 셀.The flash memory cell of claim 1, wherein a thickness of the gate oxide film of the memory cell transistor is equal to a thickness of the gate oxide film of the depletion type string selection transistor. 제3항에 있어서, 상기 메모리 셀 트랜지스터의 게이트 구조는 전기적 개서가 가능하도록 부유 게이트/ONO 유전막/컨트롤 게이트가 차례로 적층된 축적 게이트(stact gate)인 것을 특징으로 하는 플래쉬 메모리 셀.The flash memory cell of claim 3, wherein the gate structure of the memory cell transistor is a stag gate in which a floating gate / ONO dielectric film / control gate is sequentially stacked so as to be electrically rewritable. 포켓 웰이 형성된 반도체 기판의 활성영역에 게이트 산화막을 형성하는 단계; 단일 마스크를 사용하여 메모리 셀의 활성영역과 이에 인접한 공핍형 스트링 선택트랜지스터의 채널영역을 동시에 한정한 후, 공핍형 이온주입을 실시하는 단계; 상기 노출된 게이트 산화막을 제거한 후 양자역학적 터널링이 가능한 터널 산화막을 형성하는 단계; 결과물 전면에 축적 게이트를 형성한 후, 이를 마스크로 이용하여 각 트랜지스터의 소오스/드레인 영역을 형성하는 단계; 및 결과물 전면에 층간 절연막과 금속막 배선공정을 실시하는 단계를 구비함을 특징으로 하는 셀 어레이의 제조방법.Forming a gate oxide film in an active region of a semiconductor substrate on which pocket wells are formed; Simultaneously defining the active region of the memory cell and the channel region of the depletion-mode selection transistor adjacent thereto using a single mask, and then performing a depletion type ion implantation; Forming a tunnel oxide film capable of quantum mechanical tunneling after removing the exposed gate oxide film; Forming a source / drain region of each transistor by forming a storage gate on the entire surface of the resultant and using the storage gate as a mask; And performing an interlayer insulating film and a metal film wiring process on the entire surface of the resultant product. 제5항에 있어서, 상기 축적 게이트는 전기적 개서가 가능하도록 부유 게이트/ONO 유전막/컨트롤 게이트가 차례로 적층되어 있는 것을 특징으로 하는 셀 어레이의 제조방법.6. The method of claim 5, wherein the floating gate / ONO dielectric layer / control gate are sequentially stacked so that the storage gate can be electrically rewritten. 직렬 접속된 한쌍의 트랜지스터들로 이루어진 다수의 데이타 기억용 메모리 셀들, 이들 셀 가운데 적어도 어느 하나의 특정 셀을 선택하기 위해 공핍형 및 증가형 트랜지스터가 직렬 접속된 2개의 스트링 선택라인, 및 접지선택 트랜지스터가 접속된 접지선택 라인이 비트라인과 소오스라인 사이에 서로 직렬회로로 구성되어 하나의 단위스트링(string)을 구성하며, 상기 이웃한 단위 스트링들이 하나의 비트라인 콘택을 공유하는 공유된 비트라인 셀을 동작시키는 방법에 있어서, 상기 선택 셀을 독출(read)하기 위한 동작 방법은 상기 스트링 선택라인들에 접속된 스트링 선택트랜지스터들 가운데 공핍형 스트링 선택트랜지스터를 턴-온시키기 위하여 0V 이상이면서 상기 공핍형 스트링 선택트랜지스터에 이웃한 증가형 스트링 선택트랜지스터의 문턱전압 이하의 값을 갖는 전압을 리드전압으로 인가하고, 상기 증가형 스트링 선택트랜지스터를 턴-온시키기 위해 이 증가형 스트링 선택트랜지스터의 문턱전압 이상의 전압을 인가하여 이웃한 공핍형 스트링 선택트랜지스터도 동시에 턴-온시키는 것으르 특징을 하는 플래쉬 메모리 셀의 동작방법.A plurality of data storage memory cells consisting of a pair of transistors connected in series, two string selection lines in which depletion and anisotropic transistors are connected in series to select at least one specific cell among these cells, A ground selection line connected to the bit line and the source line is constituted by a series circuit between the bit line and the source line to constitute a unit string and the neighboring unit strings form a shared bit line cell The method of claim 1, wherein the operation of reading the selected cell further comprises: selecting one of the string selection transistors connected to the string selection lines to turn on the depletion type string selection transistor, The threshold voltage of the incremental string selection transistor adjacent to the string selection transistor Applying a voltage greater than or equal to a threshold voltage of the incremental string selection transistor to turn on the incremental string selection transistor so that the neighboring depletion- The method comprising the steps of: 제7항에 있어서, 상기 증가형 스트링 선택트랜지스터를 턴-온시키기 위한 리드전압은 Vcc 이상인 것을 특징으로 하는 플래쉬 메모리 셀의 동작방법.8. The method of claim 7, wherein the read voltage for turning on the incremental string selection transistor is greater than or equal to Vcc. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019960004697A 1996-02-26 1996-02-26 A flash memory cell and method for manufacturing and operating thereof KR100219475B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990071463A (en) * 1998-02-05 1999-09-27 가나이 쓰토무 Semiconductor integrated circuit device
KR100779479B1 (en) * 2004-12-24 2007-11-26 가부시키가이샤 리코 Semiconductor device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110017685A (en) 2009-08-14 2011-02-22 삼성전자주식회사 Semiconductor device and method of fabricating the same
KR101855437B1 (en) * 2010-12-02 2018-05-08 삼성전자주식회사 Nonvolatile memory device and operating method thereof
KR101873548B1 (en) 2012-03-29 2018-07-02 삼성전자주식회사 Method of programming a nonvolatile memory device having a shared bit line structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990071463A (en) * 1998-02-05 1999-09-27 가나이 쓰토무 Semiconductor integrated circuit device
KR100779479B1 (en) * 2004-12-24 2007-11-26 가부시키가이샤 리코 Semiconductor device

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