JP2018182349A - 単一ポリ不揮発性メモリデバイス - Google Patents
単一ポリ不揮発性メモリデバイス Download PDFInfo
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- 125000006850 spacer group Chemical group 0.000 claims abstract description 66
- 239000000758 substrate Substances 0.000 claims description 41
- 239000004065 semiconductor Substances 0.000 claims description 38
- 150000002500 ions Chemical class 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 16
- 229910021332 silicide Inorganic materials 0.000 claims description 15
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 169
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 230000006870 function Effects 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 5
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 5
- 229920005591 polysilicon Polymers 0.000 description 5
- 239000002356 single layer Substances 0.000 description 5
- 108010075750 P-Type Calcium Channels Proteins 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 4
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 238000010893 electron trap Methods 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
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- 238000002407 reforming Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/10—Programming or data input circuits
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
- G11C16/0408—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells containing floating gate transistors
- G11C16/0433—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells containing floating gate transistors comprising cells containing a single floating gate transistor and one or more separate select transistors
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
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- G11C16/10—Programming or data input circuits
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
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- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
- H01L29/42324—Gate electrodes for transistors with a floating gate
- H01L29/42328—Gate electrodes for transistors with a floating gate with at least one additional gate other than the floating gate and the control gate, e.g. program gate, erase gate or select gate
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7833—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's
- H01L29/7834—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's with a non-planar structure, e.g. the gate or the source or the drain being non-planar
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
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- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/788—Field effect transistors with field effect produced by an insulated gate with floating gate
- H01L29/7881—Programmable transistors with only two possible levels of programmation
- H01L29/7884—Programmable transistors with only two possible levels of programmation charging by hot carrier injection
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- H10B41/35—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region with a cell select transistor, e.g. NAND
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Abstract
Description
と、共有ドーピング領域と合併される第2LDD領域とを含む。
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2 ユニットセル
3 ユニットセル
4 ユニットセル
12 選択ゲート(SG)
14 フローティングゲート(FG)
60 ドレイン側延伸改質領域
62 延伸改質領域
100 半導体基板
110 Nウェル(NW)
112 P+ソースドーピング領域
112a P型低濃度ドープドレイン(PLDD)領域
114 P+ドーピング領域
114a PLDD領域
114b PLDD領域
116 P+ドレインドーピング領域
116a N型低濃度ドープドレイン(NLDD)領域
116b P−LDD領域
120 選択ゲート酸化層
122 側壁スペーサ
140 フローティングゲート酸化層
142 側壁スペーサ
210 サリサイド層
212 シリサイド層又はサリサイド層
214 シリサイド層又はサリサイド層
216 サリサイド層
300 サリサイドブロック(SAB)層
312 コンフォーマルコンタクトエッチストップ層(CESL)
320 層間誘電体(ILD)層
321 ソースラインコンタクト
322 ビットラインコンタクト
BL ビットライン
FT フローティングゲートトランジスタ
NLDD N型低濃度ドープドレイン
NW Nウェル
SG 選択ゲート
SL ソースライン
ST 選択トランジスタ
Claims (15)
- 単一ポリ不揮発性メモリ(NVM)セルであって、
半導体基板と、
前記半導体基板内に位置するイオンウェルと、
前記イオンウェル上に位置する選択ゲート、前記選択ゲートと前記半導体基板との間に位置する選択ゲート酸化層、前記選択ゲートの側壁と前記選択ゲート酸化層の側壁を覆う第1側壁スペーサ、前記イオンウェル内に位置するソースドーピング領域、前記イオンウェル内に位置するとともに前記ソースドーピング領域と合併された第1低濃度ドープドレイン(LDD)領域、前記ソースドーピング領域と離間している共有ドーピング領域、及び、前記イオンウェル内に位置するとともに前記共有ドーピング領域と合併される第2LDD領域を備える選択トランジスタと、
前記イオンウェル上に位置するフローティングゲート、前記フローティングゲートと前記半導体基板との間に位置するフローティングゲート酸化層、前記フローティングゲートの側壁と前記フローティングゲート酸化層の側壁を覆う第2側壁スペーサ、前記共有ドーピング領域、前記イオンウェル内に位置するとともに前記共有ドーピング領域と合併される第3LDD領域、前記共有ドーピング領域と離間しているドレインドーピング領域を備え、かつ前記選択トランジスタに直列接続されるフローティングゲートトランジスタと、
前記単一ポリNVMセルのドレイン側の前記第2側壁スペーサの真下に位置し、かつ、前記ドレインドーピング領域に近接するドレイン側延伸改質領域と、
前記ソースドーピング領域上に位置する第1サリサイド層と、
前記フローティングゲートを覆い、かつ、前記フローティングゲートと直接接触するシリサイドブロック(SAB)層とを含み、
前記共有ドーピング領域とドレインドーピング領域との間に非対称的なLDD構成が形成され、
前記ドレイン側延伸改質領域のドーピング濃度は、前記イオンウェルのドーピング濃度と同じであり、
プログラミング動作中に電子が前記フローティングゲート内に注入される、単一ポリNVMセル。 - 前記ドレイン側延伸改質領域は、前記ドレインドーピング領域の導電性タイプとは異なる導電性タイプを有する、請求項1に記載の単一ポリNVMセル。
- 前記ドレイン側延伸改質領域のドーピング濃度は、前記ドレインドーピング領域のドーピング濃度よりも低い、請求項1に記載の単一ポリNVMセル。
- 前記SAB層上にコンタクトエッチストップ層を更に含み、前記フローティングゲートは、前記SAB層によって前記コンタクトエッチストップ層から分離される、請求項1に記載の単一ポリNVMセル。
- 前記コンタクトエッチストップ層上に層間誘電体(ILD)層を更に含む、請求項4に記載の単一ポリNVMセル。
- 前記第1サリサイド層は、前記第1側壁スペーサの底部の縁部に延伸する、請求項1に記載の単一ポリNVMセル。
- 前記共有ドーピング領域上に第2サリサイド層を更に含み、前記第2サリサイド層は、前記第1側壁スペーサの底部の縁部と連続するが、前記第2側壁スペーサの底部の縁部から所定の距離を保つ、請求項1記載の単一ポリNVMセル。
- 前記ドレインドーピング領域上に第3サリサイド層を更に含み、前記第3サリサイド層は、前記第2側壁スペーサの底部の縁部から所定の距離を保つ、請求項7に記載の単一ポリNVMセル。
- 前記選択ゲートの上面上に第4サリサイド層を更に含む、請求項8に記載の単一ポリNVMセル。
- シリサイド層が、前記フローティングゲートの上面上に形成されない、請求項1に記載の単一ポリNVMセル。
- 前記SAB層は、酸化ケイ素を含む、請求項1に記載の単一ポリNVMセル。
- 前記SAB層は、前記フローティングゲートの上面、前記第2側壁スペーサの表面、前記共有ドーピング領域の一部のみ及び前記ドレインドーピング領域の一部のみを覆い、かつ、それらと直接接触している、請求項1に記載の単一ポリNVMセル。
- 前記選択トランジスタ及び前記フローティングゲートトランジスタは、両方ともPMOSトランジスタである、請求項1に記載の単一ポリNVMセル。
- 前記イオンウェルは、Nウェルであり、前記ソースドーピング領域、前記共有ドーピング領域及び前記ドレインドーピング領域は、P+ドーピング領域である、請求項13に記載の単一ポリNVMセル。
- 前記第1LDD領域、前記第2LDD領域及び前記第3LDD領域は、PLDD領域である、請求項14に記載の単一ポリNVMセル。
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US201562242310P | 2015-10-16 | 2015-10-16 | |
US15/293,299 | 2016-10-14 | ||
US15/293,299 US10083757B2 (en) | 2015-10-16 | 2016-10-14 | Single poly nonvolatile memory device |
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US10083757B2 (en) | 2018-09-25 |
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US20170110467A1 (en) | 2017-04-20 |
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