JP7376628B2 - 半導体素子及びその製造方法 - Google Patents
半導体素子及びその製造方法 Download PDFInfo
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- JP7376628B2 JP7376628B2 JP2022024545A JP2022024545A JP7376628B2 JP 7376628 B2 JP7376628 B2 JP 7376628B2 JP 2022024545 A JP2022024545 A JP 2022024545A JP 2022024545 A JP2022024545 A JP 2022024545A JP 7376628 B2 JP7376628 B2 JP 7376628B2
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- 239000004065 semiconductor Substances 0.000 title claims description 41
- 238000004519 manufacturing process Methods 0.000 title description 9
- 230000015654 memory Effects 0.000 claims description 324
- 239000003989 dielectric material Substances 0.000 claims description 261
- 230000002093 peripheral effect Effects 0.000 claims description 219
- 238000000034 method Methods 0.000 claims description 202
- 239000000463 material Substances 0.000 claims description 127
- 229910052751 metal Inorganic materials 0.000 claims description 119
- 239000002184 metal Substances 0.000 claims description 119
- 238000002955 isolation Methods 0.000 claims description 78
- 239000000758 substrate Substances 0.000 claims description 77
- 239000002131 composite material Substances 0.000 claims description 60
- 238000007667 floating Methods 0.000 claims description 58
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 24
- 238000000151 deposition Methods 0.000 claims description 23
- 229910021332 silicide Inorganic materials 0.000 claims description 23
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims description 23
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 21
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 17
- 239000007769 metal material Substances 0.000 claims description 10
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 7
- 238000001039 wet etching Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000000704 physical effect Effects 0.000 claims description 4
- 239000002243 precursor Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 687
- 238000005530 etching Methods 0.000 description 118
- 238000000059 patterning Methods 0.000 description 60
- 239000004020 conductor Substances 0.000 description 31
- 150000004767 nitrides Chemical class 0.000 description 24
- 229920002120 photoresistant polymer Polymers 0.000 description 24
- 230000004888 barrier function Effects 0.000 description 22
- 239000011248 coating agent Substances 0.000 description 15
- 238000000576 coating method Methods 0.000 description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 12
- 238000005468 ion implantation Methods 0.000 description 12
- 229910052710 silicon Inorganic materials 0.000 description 12
- 239000010703 silicon Substances 0.000 description 12
- 125000006850 spacer group Chemical group 0.000 description 11
- 238000004380 ashing Methods 0.000 description 10
- 238000005137 deposition process Methods 0.000 description 10
- 230000000670 limiting effect Effects 0.000 description 10
- 239000002904 solvent Substances 0.000 description 10
- 238000005229 chemical vapour deposition Methods 0.000 description 6
- 239000005360 phosphosilicate glass Substances 0.000 description 6
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 4
- 239000005368 silicate glass Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 229910021417 amorphous silicon Inorganic materials 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229910001092 metal group alloy Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000012811 non-conductive material Substances 0.000 description 3
- 238000000206 photolithography Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 2
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000000231 atomic layer deposition Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 238000007429 general method Methods 0.000 description 2
- 239000007943 implant Substances 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 2
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000002210 silicon-based material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010301 surface-oxidation reaction Methods 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- 229910004129 HfSiO Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- VSTCOQVDTHKMFV-UHFFFAOYSA-N [Ti].[Hf] Chemical compound [Ti].[Hf] VSTCOQVDTHKMFV-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- IVHJCRXBQPGLOV-UHFFFAOYSA-N azanylidynetungsten Chemical compound [W]#N IVHJCRXBQPGLOV-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- ZQXQADNTSSMHJI-UHFFFAOYSA-N hafnium(4+) oxygen(2-) tantalum(5+) Chemical compound [O-2].[Ta+5].[Hf+4] ZQXQADNTSSMHJI-UHFFFAOYSA-N 0.000 description 1
- KQHQLIAOAVMAOW-UHFFFAOYSA-N hafnium(4+) oxygen(2-) zirconium(4+) Chemical compound [O--].[O--].[O--].[O--].[Zr+4].[Hf+4] KQHQLIAOAVMAOW-UHFFFAOYSA-N 0.000 description 1
- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(iv) oxide Chemical compound O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000000608 laser ablation Methods 0.000 description 1
- 238000005224 laser annealing Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000000992 sputter etching Methods 0.000 description 1
- -1 such as Co Substances 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
- H10B41/41—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region of a memory region comprising a cell select transistor, e.g. NAND
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/29—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the material, e.g. carbon
- H01L23/291—Oxides or nitrides or carbides, e.g. ceramics, glass
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/30—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/56—Encapsulations, e.g. encapsulation layers, coatings
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/401—Multistep manufacturing processes
- H01L29/4011—Multistep manufacturing processes for data storage electrodes
- H01L29/40114—Multistep manufacturing processes for data storage electrodes the electrodes comprising a conductor-insulator-conductor-insulator-semiconductor structure
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- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
- H01L29/41775—Source or drain electrodes for field effect devices characterised by the proximity or the relative position of the source or drain electrode and the gate electrode, e.g. the source or drain electrode separated from the gate electrode by side-walls or spreading around or above the gate electrode
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- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66825—Unipolar field-effect transistors with an insulated gate, i.e. MISFET with a floating gate
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- 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
- H01L29/788—Field effect transistors with field effect produced by an insulated gate with floating gate
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/30—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region
- 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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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
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- H—ELECTRICITY
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
- H10B41/42—Simultaneous manufacture of periphery and memory cells
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
- H10B41/42—Simultaneous manufacture of periphery and memory cells
- H10B41/43—Simultaneous manufacture of periphery and memory cells comprising only one type of peripheral transistor
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
- H10B41/42—Simultaneous manufacture of periphery and memory cells
- H10B41/49—Simultaneous manufacture of periphery and memory cells comprising different types of peripheral transistor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
- H01L23/3157—Partial encapsulation or coating
- H01L23/3192—Multilayer coating
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/50—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the boundary region between the core region and the peripheral circuit region
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Non-Volatile Memory (AREA)
- Semiconductor Memories (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
Description
101 複合誘電体膜構造
102 第1の誘電体材料層/第1の誘電体層
103 第2の誘電体材料層/第2の誘電体層
110 導電性導通ピラー
112 金属特徴部
210 基板
212 メモリ領域
214 周辺領域
220 第1の誘電体材料層/第1の誘電体層/トンネル層
220A 誘電体材料層
230 第2の誘電体材料層/第2の誘電体層
232、234 活性領域
240 第3の誘電体材料層/第3の誘電体層
241 第4の誘電体材料層/第4の誘電体層
243、243L 浮遊ゲート層
245 バリア層
247 制御ゲート層
249、251 窒化物層
250 酸化物層
270 側壁構造
270a 第1の酸化物層
280 ソース間誘電体層
282 選択ゲート誘電体層
283 導電性材料層
285、288 BLコーティング
287、350 ハードマスク層
291 ライナー
293 被覆層
295 BARC層
297、353 主側壁スペーサ
310 第1の領域
320 第2の領域
330 ゲート誘電体材料層
340 犠牲ゲート材料層
351 ゲートスタック側封止層
355 金属シリサイド領域
357 CESL
380 金属シリサイド層
410、412 ILD層
430 境界
431 周縁
500 方法
502、504、506 ステップ
CG 制御ゲート
CR チャネル領域
CS ソース領域
DR ドレイン領域
EG 消去ゲート
FG 浮遊ゲート
GS1、GS2、GS3 ゲートスタック
HD1、HD2 水平方向
HM ハードマスク
IF1、IF2 隔離特徴部
LT1、LT2 ロジックトランジスタ
MC、MC1~MC4、SGMC1、SGMC2 メモリセル
MG、MG1、MG2 金属ゲート
MS1、MS2、MS3、MS4 メモリスタック
PR マスク
SD ソース及びドレイン領域
SG 選択ゲート
Claims (10)
- メモリ領域及び周辺領域を含む基板と、
前記周辺領域に位置する金属ゲートを含むトランジスタと、
前記トランジスタの前記金属ゲートの上方に位置し、第1の誘電体層と、前記第1の誘電体層の上方に位置するとともに前記メモリ領域の上方に位置せず、且つ密度が前記第1の誘電体層の密度よりも大きい第2の誘電体層と、を含む複合誘電体膜構造と、
前記メモリ領域に位置する少なくとも1つのメモリセルと、を含む半導体素子。 - 前記第1の誘電体層は、テトラエトキシシラン前駆体により形成された酸化ケイ素及びレジスト保護酸化物材料のうちの少なくとも1つを含む誘電体材料を含み、前記トランジスタの前記金属ゲートの上面に接触するが、前記第2の誘電体層は、緩衝酸化物材料、窒化ケイ素材料及び高温酸化物材料のうちの少なくとも1つを含む誘電体材料を含み、前記第1の誘電体層及び前記第2の誘電体層の各々は、5nm~30nmの間の厚さを有する請求項1に記載の半導体素子。
- 前記複合誘電体膜構造の下面は、前記少なくとも1つのメモリセルの上面と面一であり、前記少なくとも1つのメモリセルは、浮遊ゲートと、前記浮遊ゲートの上に位置する制御ゲートと、前記浮遊ゲート及び前記制御ゲートの第1の側に位置する選択ゲートと、を含み、前記複合誘電体膜構造の前記下面は、前記制御ゲートの上面と面一であり、前記少なくとも1つのメモリセルは、前記浮遊ゲート及び前記制御ゲートの第2の側に位置する消去ゲートを更に含み、金属シリサイド層は、前記選択ゲートの上面及び前記消去ゲートの上面に位置する請求項1に記載の半導体素子。
- 前記半導体素子は、前記周辺領域に位置する金属ゲート及び前記メモリ領域に位置する複数のメモリセルを含む複数のトランジスタを含み、前記複合誘電体膜構造は、前記周辺領域における前記トランジスタの前記金属ゲートの上方に位置し、且つ前記メモリ領域における前記メモリセルの上方に位置しない請求項1に記載の半導体素子。
- メモリ領域及び周辺領域を含む基板と、
前記メモリ領域に位置する複数のメモリセルと、
前記周辺領域に位置する複数のトランジスタと、
前記周辺領域における前記トランジスタの上方に延伸し、第1の誘電体層と、前記第1の誘電体層の上方に位置するとともに前記メモリ領域の上方に位置しない第2の誘電体層の少なくとも2つの誘電体材料層を含み、その周縁が前記メモリ領域と前記周辺領域の間の境界の300nm以内に位置する複合誘電体膜構造と、
前記複合誘電体膜構造を貫通するように延伸する複数の導電性導通ピラーと、
を含み、
前記複合誘電体膜構造は、前記周辺領域における前記導電性導通ピラーの間に連続的に延伸する半導体素子。 - 前記メモリ領域と前記周辺領域の間の前記境界は、前記基板に位置する隔離特徴部の周縁によって定義され、前記メモリ領域における前記基板の上面は、前記周辺領域における前記基板の上面に対して凹んでいる請求項5に記載の半導体素子。
- 前記周辺領域における前記トランジスタの各々は、金属ゲートを含み、前記複合誘電体膜構造は、前記周辺領域における前記トランジスタの前記金属ゲートの上方に位置し、前記複合誘電体膜構造は、異なる組成及び/又は物理特性を有する少なくとも2つの誘電体材料層を含む請求項5に記載の半導体素子。
- メモリセルを基板のメモリ領域に形成するステップと、
金属ゲートを含むトランジスタを前記基板の周辺領域に形成するステップと、
第1の誘電体層と、前記第1の誘電体層の上方に位置するとともに密度が前記第1の誘電体層の密度よりも大きい第2の誘電体層と、を含む複合誘電体膜構造を、前記基板の前記周辺領域における前記トランジスタの前記金属ゲートの上方に形成するステップと、
金属シリサイド層を前記メモリセルの選択ゲート及び消去ゲートのうちの少なくとも1つの上面の上方に形成するステップと、
前記複合誘電体膜構造を貫通して前記周辺領域における前記トランジスタのソース及びドレイン領域に電気的に接触するように導電性導通ピラーを形成するステップと、
ウェットエッチングを実行することで、半導体素子から金属材料を除去するステップと、
を含み、
前記金属シリサイド層の形成中に、前記第1の誘電体層の一部は、前記メモリセルの制御ゲートの上方に位置し、
前記複合誘電体膜構造は、前記周辺領域における前記トランジスタの前記金属ゲートがエッチングされないように保護する半導体素子の製造方法。 - 前記複合誘電体膜構造を形成するステップは、
第1の誘電体層を前記周辺領域における前記トランジスタの前記金属ゲートの上方及び前記メモリ領域における前記メモリセルの前記制御ゲートの上方に形成するステップと、
前記第2の誘電体層を前記周辺領域における前記第1の誘電体層の上方に形成して前記複合誘電体膜構造を形成するステップと、
を含み、
前記複合誘電体膜構造は、前記半導体素子の前記メモリ領域における前記メモリセルの上方に延伸しない請求項8に記載の方法。 - 前記金属シリサイド層を形成するステップは、
金属層を前記メモリセルの前記選択ゲート及び前記消去ゲートのうちの少なくとも1つの上方に堆積するステップと、
前記金属層を加熱することで前記金属シリサイド層を前記メモリセルの前記選択ゲート及び前記消去ゲートのうちの少なくとも1つの前記上面の上方に形成するステップと、
を含み、
前記ウェットエッチングの際に、前記半導体素子から余分な金属を除去する請求項8に記載の方法。
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