KR100615586B1 - 다공성 유전막 내에 국부적인 상전이 영역을 구비하는상전이 메모리 소자 및 그 제조 방법 - Google Patents
다공성 유전막 내에 국부적인 상전이 영역을 구비하는상전이 메모리 소자 및 그 제조 방법 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 230000007704 transition Effects 0.000 claims abstract description 60
- 239000010410 layer Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 31
- 239000004065 semiconductor Substances 0.000 claims description 21
- 239000000758 substrate Substances 0.000 claims description 20
- 239000002313 adhesive film Substances 0.000 claims description 14
- 239000011229 interlayer Substances 0.000 claims description 13
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 10
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- 239000008151 electrolyte solution Substances 0.000 claims description 8
- 229910000618 GeSbTe Inorganic materials 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 238000005530 etching Methods 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 2
- 230000003647 oxidation Effects 0.000 claims 2
- 238000007254 oxidation reaction Methods 0.000 claims 2
- 238000002425 crystallisation Methods 0.000 abstract description 7
- 230000008025 crystallization Effects 0.000 abstract description 7
- 239000013078 crystal Substances 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 238000007743 anodising Methods 0.000 description 2
- 150000004770 chalcogenides Chemical class 0.000 description 2
- 239000012782 phase change material Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052798 chalcogen Inorganic materials 0.000 description 1
- 150000001787 chalcogens Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/801—Constructional details of multistable switching devices
- H10N70/821—Device geometry
- H10N70/828—Current flow limiting means within the switching material region, e.g. constrictions
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D84/00—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/011—Manufacture or treatment of multistable switching devices
- H10N70/061—Shaping switching materials
- H10N70/066—Shaping switching materials by filling of openings, e.g. damascene method
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/20—Multistable switching devices, e.g. memristors
- H10N70/231—Multistable switching devices, e.g. memristors based on solid-state phase change, e.g. between amorphous and crystalline phases, Ovshinsky effect
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/801—Constructional details of multistable switching devices
- H10N70/821—Device geometry
- H10N70/826—Device geometry adapted for essentially vertical current flow, e.g. sandwich or pillar type devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/801—Constructional details of multistable switching devices
- H10N70/881—Switching materials
- H10N70/882—Compounds of sulfur, selenium or tellurium, e.g. chalcogenides
- H10N70/8828—Tellurides, e.g. GeSbTe
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Abstract
Description
Claims (29)
- 하부전극;상기 하부전극 상에 형성되며 그 내부에 다수의 미세 공들을 구비하는 다공성 유전막;상기 다공성 유전막 상에 형성되어 상기 다수의 미세 공들을 채우되, 상기 다수의 미세 공들 내에 제공된 제한된 상전이 영역들을 구비하는 상전이막; 및상기 상전이막 상에 형성되는 상부전극을 포함하되, 상기 상전이막은 상기 다수의 미세 공들을 통하여 상기 하부전극과 접촉되고, 상기 제한된 상전이 영역들은 서로 이격된 배열을 갖는 것을 특징으로 하는 상전이 메모리 소자.
- 제 1 항에 있어서,상기 다공성 유전막은 Al2O3로 이루어지는 것을 특징으로 하는 상전이 메모리 소자.
- 제 1 항에 있어서,상기 상전이막은 게르마늄 안티몬 텔룰라이드 화합물로 이루어지는 것을 특징으로 하는 상전이 메모리 소자.
- 제 1 항에 있어서,상기 하부전극은 원통 형상으로 이루어지는 것을 특징으로 하는 상전이 메모리 소자.
- 제 3 항에 있어서,상기 하부전극은 TiN으로 이루어지는 것을 특징으로 하는 상전이 메모리 소자.
- 제 1 항에 있어서,상기 상부전극의 단면적은 상기 하부전극의 단면적 보다 큰 것을 특징으로 하는 상전이 메모리 소자.
- 제 1 항에 있어서,상기 상전이막과 상기 상부전극 사이에 접착막을 더 포함하는 것을 특징으로 하는 상전이 메모리 소자.
- 제 7 항에 있어서,상기 접착막은 TiN으로 이루어지는 것을 특징으로 하는 상전이 메모리 소자.
- 반도체 기판;상기 반도체 기판을 덮는 층간절연막;상기 층간절연막을 통하는 콘택홀 내에 형성되어 상기 반도체 기판과 연결되는 하부전극;상기 하부전극 상에 형성되며 그 내부에 다수의 미세 공들을 포함하는 다공성 유전막;상기 다공성 유전막 상에 형성되어 상기 미세 공들을 채우되, 상기 다수의 미세 공들 내에 제공된 제한된 상전이 영역들을 구비하는 상전이막; 및상기 상전이막 상에 형성되는 상부전극을 포함하되, 상기 상전이막은 상기 다수의 미세 공들을 통하여 상기 하부전극과 접촉되고, 상기 제한된 상전이 영역들은 서로 이격된 배열을 갖는 것을 특징으로 하는 상전이 메모리 소자.
- 제 9 항에 있어서,상기 다공성 유전막은 Al2O3로 이루어지는 것을 특징으로 하는 상전이 메모리 소자.
- 제 9 항에 있어서,상기 상전이막은 게르마늄 안티몬 텔룰라이드 화합물로 이루어지는 것을 특징으로 하는 상전이 메모리 소자.
- 제 9 항에 있어서,상기 상부전극의 단면적은 상기 하부전극의 단면적 보다 큰 것을 특징으로 하는 상전이 메모리 소자.
- 제 9 항에 있어서,상기 하부전극은 TiN으로 이루어지는 것을 특징으로 하는 상전이 메모리 소자.
- 제 9 항에 있어서,상기 상전이막과 상기 상부전극 사이에 접착막을 더 포함하는 것을 특징으로 하는 상전이 메모리 소자.
- 제 14 항에 있어서,상기 접착막은 TiN으로 이루어지는 것을 특징으로 하는 상전이 메모리 소자.
- 반도체 기판 상에 하부전극을 형성하는 단계;상기 하부전극 상에 다수의 미세 공들을 구비하는 다공성 유전막을 형성하되, 상기 다수의 미세 공들에 의하여 상기 하부전극이 노출되는 단계;상기 다공성 유전막 상에 상기 다수의 미세 공들을 채우는 상전이막을 형성하되, 상기 다수의 미세 공들 내에 제한된 상전이 영역들이 제공되고, 상기 제한된 상전이 영역들은 서로 이격된 배열을 갖도록 하는 단계; 및상기 상전이막 상에 상부전극을 형성하는 단계를 포함하는 상전이 메모리 소자 제조 방법.
- 제 16 항에 있어서,상기 다공성 유전막을 형성하는 단계는,상기 하부전극 및 상기 하부전극 주변의 상기 기판 상에 알루미늄막을 형성하는 단계; 및상기 알루미늄막을 산화시켜 Al2O3로 이루어지는 상기 다공성 유전막을 형성하는 단계를 포함하는 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
- 제 17 항에 있어서,양극 산화를 실시하여 상기 Al2O3를 형성하는 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
- 제 18 항에 있어서,상기 양극 산화는 산성 전해질 용액을 이용하여 실시하는 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
- 제 19 항에 있어서,상기 산성 전해질 용액은 옥살산, 인산 및 황산으로 이루어진 그룹에서 선택된 어느 하나인 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
- 제 16 항에 있어서,상기 상전이막을 게르마늄 안티몬 텔룰라이드 화합물로 형성하는 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
- 제 21 항에 있어서,상기 상전이막을 형성하는 단계 후,상기 상전이막을 리플로우 하는 단계를 더 포함하는 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
- 제 22 항에 있어서,상기 리플로우는 400 ℃ 내지 600 ℃ 온도에서 실시하는 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
- 제 23 항에 있어서,상기 리플로우는 10분 내지 15분 동안실시하는 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
- 제 16 항에 있어서,상기 하부전극을 형성하는 단계는상기 반도체 기판 상에 층간절연막을 형성하는 단계;상기 층간절연막을 선택적으로 식각하여 상기 반도체 기판 표면을 노출시키는 콘택홀을 형성하는 단계;상기 콘택홀 형성이 완료된 상기 반도체 기판 상에 전도막을 형성하여 상기 콘택홀 내부를 채우는 단계; 및상기 층간절연막 표면이 노출될 때까지 상기 전도막을 제거하는 단계를 포함하는 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
- 제 16항에 있어서,상기 상부전극의 단면적을 상기 하부전극의 단면적 보다 크게 형성하는 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
- 제 16 항에 있어서,상기 하부전극을 TiN으로 형성하는 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
- 제 16 항에 있어서,상기 상전이막 상에 접착막을 형성하는 단계를 더 포함하는 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
- 제 28 항에 있어서,상기 접착막을 TiN으로 형성하는 것을 특징으로 하는 상전이 메모리 소자 제조 방법.
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KR1020030050779A KR100615586B1 (ko) | 2003-07-23 | 2003-07-23 | 다공성 유전막 내에 국부적인 상전이 영역을 구비하는상전이 메모리 소자 및 그 제조 방법 |
US10/827,687 US7323708B2 (en) | 2003-07-23 | 2004-04-19 | Phase change memory devices having phase change area in porous dielectric layer |
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US7323708B2 (en) | 2008-01-29 |
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