JP2007227922A - 非晶質合金酸化層を含む不揮発性メモリ素子 - Google Patents
非晶質合金酸化層を含む不揮発性メモリ素子 Download PDFInfo
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- 229910000808 amorphous metal alloy Inorganic materials 0.000 title claims abstract description 31
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 8
- 229910052723 transition metal Inorganic materials 0.000 claims description 8
- 150000003624 transition metals Chemical class 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 229910002064 alloy oxide Inorganic materials 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 229910052735 hafnium Inorganic materials 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 3
- 229910052741 iridium Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 229910052707 ruthenium Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 239000005300 metallic glass Substances 0.000 claims 1
- 239000010409 thin film Substances 0.000 description 11
- 229910000314 transition metal oxide Inorganic materials 0.000 description 11
- 239000000758 substrate Substances 0.000 description 7
- 238000004626 scanning electron microscopy Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910002367 SrTiO Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- H—ELECTRICITY
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- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
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- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02172—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
- H01L21/02197—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides the material having a perovskite structure, e.g. BaTiO3
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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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
- H01L21/31691—Inorganic layers composed of oxides or glassy oxides or oxide based glass with perovskite structure
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/47—Schottky barrier electrodes
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B63/00—Resistance change memory devices, e.g. resistive RAM [ReRAM] devices
- H10B63/20—Resistance change memory devices, e.g. resistive RAM [ReRAM] devices comprising selection components having two electrodes, e.g. diodes
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- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
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- H10N70/883—Oxides or nitrides
- H10N70/8833—Binary metal oxides, e.g. TaOx
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Abstract
【解決手段】不揮発性半導体メモリ素子において、下部電極と、下部電極上に非晶質合金酸化物を含んで形成された酸化層と、酸化層上に形成された上部電極とを備える非晶質合金酸化層を含む不揮発性メモリ素子である。
【選択図】図3
Description
本発明において、前記第1金属に含まれる遷移金属としては、Ni、Ti、Hf、Zr、Zn、W、CoまたはNbのうち、いずれか一つであることを特徴とする。
本発明において、前記下部電極または上部電極は、前記酸化層とショットキー接合構造であることを特徴とする。
本発明において、前記酸化層がp型酸化物から形成され、前記下部電極または上部電極のうちいずれか一つは、TiまたはAgから形成されたことを特徴とする。
第一に、不揮発性メモリの構造が全体的に非常に簡単なので、これをアレイ構造により形成する場合、従来の一般的なDRAM製造工程など、一般的に周知の半導体製造工程を利用して容易に形成することができる。
図3を参照すれば、本発明の実施例による非晶質合金酸化層を含む不揮発性メモリ素子は、基板30上に順次に形成された下部電極32、非晶質酸化物から形成された酸化層34及び上部電極36を備える。
酸化層34は、抵抗変換物質から形成され、基本的に結晶特性の異なる二種以上の金属を含む合金酸化物から形成される。そして、金属のうち少なくとも一つは、遷移金属であることが望ましい。遷移金属としては、Ni、Ti、Hf、Zr、Zn、W、CoまたはNbを挙げることができ、それらの酸化物は、NiO、TiO2、HfO、ZrO、ZnO、WO3、CoOまたはNb2O5の形態となる。そして、付加される金属としては、前記遷移金属と結晶特性が異なるAl(Al2O3)またはIn(In2O3)を挙げることができる。
図6Aは、本発明の実施例による非晶質合金酸化層を含む不揮発性メモリ素子の耐久性(endurance)特性を示したグラフである。ここで使われた試片は、下部電極32はIrOx、酸化層34はInZnOx、上部電極36はIrOxから形成したものである。図6Aの結果は、図5のように測定対象試片に対して−3Vないし3V印加し、さらに3Vから−3Vに電圧を印加するスウィーピング(sweeping)過程を約100回余り反復した酸化層34が低い抵抗状態(LRS)及び高い抵抗状態(HRS)を有する場合、それぞれの抵抗値を測定した結果を示したグラフである。
本発明の実施例による非晶質合金酸化層を含む不揮発性メモリ素子の場合、従来の一般的なDRAM製造工程など、一般的に周知の半導体製造工程を利用して容易に形成することができる。
12,32 下部電極
14,34 酸化層
16,36 上部電極
Claims (7)
- 不揮発性半導体メモリ素子において、
下部電極と、
前記下部電極上に非晶質合金酸化物を含んで形成された酸化層と、
前記酸化層上に形成された上部電極とを備えることを特徴とする非晶質合金酸化層を含む不揮発性メモリ素子。 - 前記酸化層は、遷移金属を含む第1金属、及び、前記第1金属と結晶特性が互いに異なる第2金属の合金酸化物から形成されたことを特徴とする請求項1に記載の非晶質合金酸化層を含む不揮発性メモリ素子。
- 前記第1金属に含まれる遷移金属としては、Ni、Ti、Hf、Zr、Zn、W、CoまたはNbのうち、いずれか一つであることを特徴とする請求項2に記載の非晶質合金酸化層を含む不揮発性メモリ素子。
- 前記第2金属は、AlまたはInであることを特徴とする請求項2に記載の非晶質合金酸化層を含む不揮発性メモリ素子。
- 前記下部電極または上部電極は、前記酸化層とショットキー接合構造であることを特徴とする請求項1に記載の非晶質合金酸化層を含む不揮発性メモリ素子。
- 前記酸化層がn型酸化物から形成され、前記下部電極または上部電極のうちいずれか一つは、Pt、Ir、Ruまたはそれらの酸化物から形成されたことを特徴とする請求項5に記載の非晶質合金酸化層を含む不揮発性メモリ素子。
- 前記酸化層がp型酸化物から形成され、前記下部電極または上部電極のうちいずれか一つは、TiまたはAgから形成されたことを特徴とする請求項5に記載の非晶質合金酸化層を含む不揮発性メモリ素子。
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KR1020060016224A KR100723420B1 (ko) | 2006-02-20 | 2006-02-20 | 비정질 합금 산화층을 포함하는 비휘발성 메모리 소자 |
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WO2009057671A1 (ja) * | 2007-10-30 | 2009-05-07 | National Institute Of Advanced Industrial Science And Technology | 整流素子及びその製造方法 |
US8487415B2 (en) | 2007-10-30 | 2013-07-16 | National Institute Of Advanced Industrial Science And Technology | Rectifier and process for producing the rectifier |
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CN101192647A (zh) | 2008-06-04 |
JP4938489B2 (ja) | 2012-05-23 |
CN101192647B (zh) | 2012-05-02 |
KR100723420B1 (ko) | 2007-05-30 |
US20070257257A1 (en) | 2007-11-08 |
US8455854B2 (en) | 2013-06-04 |
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