JPWO2016111306A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 16
- 239000012212 insulator Substances 0.000 claims abstract description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052751 metal Inorganic materials 0.000 claims abstract description 28
- 239000002184 metal Substances 0.000 claims abstract description 28
- 239000001301 oxygen Substances 0.000 claims abstract description 28
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 28
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 22
- 230000005290 antiferromagnetic effect Effects 0.000 claims abstract description 20
- 239000013078 crystal Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910001868 water Inorganic materials 0.000 claims abstract description 18
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 11
- 239000000696 magnetic material Substances 0.000 claims abstract description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000001257 hydrogen Substances 0.000 claims abstract description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 9
- 229910002367 SrTiO Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- 229910020068 MgAl Inorganic materials 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 239000010457 zeolite Substances 0.000 claims description 2
- 230000005291 magnetic effect Effects 0.000 description 50
- 239000010408 film Substances 0.000 description 29
- 239000010409 thin film Substances 0.000 description 11
- 239000011148 porous material Substances 0.000 description 8
- -1 hydroxide ions Chemical class 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000002441 X-ray diffraction Methods 0.000 description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000002608 ionic liquid Substances 0.000 description 5
- 230000005415 magnetization Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 238000005566 electron beam evaporation Methods 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004549 pulsed laser deposition Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- GPAAEXYTRXIWHR-UHFFFAOYSA-N (1-methylpiperidin-1-ium-1-yl)methanesulfonate Chemical compound [O-]S(=O)(=O)C[N+]1(C)CCCCC1 GPAAEXYTRXIWHR-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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- 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
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66984—Devices using spin polarized carriers
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
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Abstract
Description
酸化物の磁性材料からなる活性層と、
活性層の上に設けられた、水を含有する多孔質誘電体と、を含み、
水の電気分解で形成された水素および酸素を用いて、強磁性金属と反強磁性絶縁体との間で活性層の結晶構造を変化させることを特徴とする半導体装置である。
基板と、
基板の上に設けられた、酸化物の磁性材料からなる活性層と、
基板の上に、活性層を挟んで配置されたソース電極およびドレイン電極と、
活性層の上に設けられた、水を含有する多孔質誘電体と、
多孔質誘電体の上に設けられたゲート電極と、を含み、
ゲート電極に電圧を印加して水を電気分解し、形成された水素および酸素を用いて、強磁性金属と反強磁性絶縁体との間で活性層の結晶構造を変化させることを特徴とする半導体装置でもある。
磁性トランジスタ100の作製は、最初に(001)SrTiO3単結晶基板(信光社製、サイズ10×10×0.5mm)を準備し、その上に、パルスレーザー堆積法により、膜厚30nmのSrCoO2.5からなる活性層2を、金属マスク(ピーワン製)を介して堆積した。基板温度は720℃、酸素圧力は10Paとした。
磁性トランジスタ100について、図1、図2(a)および(b)に示す状態において、活性層2のシート抵抗を室温で測定した。シート抵抗の計測には、ソース電極11およびドレイン電極12を用いた。計測の結果、シート抵抗は、ゲート電極13に電圧を印加しない状態(図1)で340kΩ/□、電圧が−50Vの状態(図2(a))で1kΩ/□、電圧が+80Vの状態(図2(b))で100kΩ/□となり、ゲート電圧を変えることによりシート抵抗を変化させ、磁性トランジスタ100をオン/オフできることがわかった。ここではゲート電極13に印加する電圧を−50Vと+80Vとしたが、後述のように、−3Vと+3Vとした場合も、シート抵抗を変化させて、磁性トランジスタ100をオン/オフできることが確認されている。
図4は、磁性トランジスタ100の活性層2のX線回折図形であり、(a)はゲート電圧印加前および正のゲート電圧(+80V)印加後(図1および図2(b)の状態)におけるX線回折図形、(b)は負のゲート電圧(−50V)印加後(図2(a)の状態)におけるX線回折図形である。横軸は散乱ベクトル、縦軸は強度(任意スケール)を表す。また、「BM」はブラウンミラライト型SrCoO2.5、「P」はペロブスカイト型SrCoO3、数字は回折指数を表す。
図5は、磁性トランジスタ100の磁化特性の温度依存性を示す。図5において、横軸は温度、縦軸なCo1原子当たりの磁化を示す。図5中、(a)はゲート電圧印加前(図1の状態)、(b)は−50Vのゲート電圧印加後(図2(a)の状態)を示す。磁気特性の測定は、磁気特性測定装置MPMS(カンタム・デザイン社製)を用いて、20Oeの磁場を印可して、10〜350Kの温度範囲で行った。
ゲート電極13に−50Vのゲート電圧を印加した場合(図2(a)の場合)、活性層2が金属になっているかどうかを調べるために、室温における熱電能を計測した。熱電能の計測は、ソース電極11とドレイン電極12の間に5〜10Kの温度差を付与し、この状態で電極間に発生する熱起電力を計測して行った。そして付与した温度差と発生した熱起電力の関係から熱電能を算出した。
図6、7は、磁性トランジスタ100のゲート電流とシート抵抗の、ゲート電圧印加時間に対する変化を示すグラフであり、図6は、活性層2の酸化時(SrCoO2.5→SrCoO3)、図7は、活性層2の還元時(SrCoO3→SrCoO2.5)を表す。
図8は、磁性トランジスタ100に様々なゲート電圧Vgを印加した場合の、活性層2の電子密度とシート抵抗との関係を示す。図8の左図は、オフ状態の磁性トランジスタ100のゲート電極に、4種類のゲート電圧Vg(−3V、−2.5V、−2V、−1.5V)を印加し、活性層2のSrCoO2.5を酸化してSrCoO3にした場合のグラフであり、図8の右図は、オン状態の磁性トランジスタ100のゲート電極に、4種類のゲート電圧Vg(+3V、+2.5V、+2V、+1.5V)を印加し、活性層2のSrCoO3を還元してSrCoO2.5にした場合のグラフである。
比較例に用いたサンプルでは、実施例と同様に、(100)SrTiO3単結晶基板(信光社製、サイズ10×10×0.5mm)を準備し、その上に、パルスレーザー堆積法によりSrCoO2.5エピタキシャル薄膜(膜厚40nm)を作製した。次に、酸素ガスを流した状態で加熱した。
2 活性層
3 ゲート絶縁膜
11 ソース電極
12 ドレイン電極
13 ゲート電極
20 水酸化物イオン(OH−)
21 プロトン(H+)
100 磁性トランジスタ
Claims (7)
- 酸化物の磁性材料からなる活性層と、
該活性層の上に設けられた、水を含有する多孔質誘電体と、を含み、
該水の電気分解で形成された水素および酸素を用いて、強磁性金属と反強磁性絶縁体との間で該活性層の結晶構造を変化させることを特徴とする半導体装置。 - 基板と、
該基板の上に設けられた、酸化物の磁性材料からなる活性層と、
該基板の上に、該活性層を挟んで配置されたソース電極およびドレイン電極と、
該活性層の上に設けられた、水を含有する多孔質誘電体と、
該多孔質誘電体の上に設けられたゲート電極と、を含み、
該ゲート電極に電圧を印加して該水を電気分解し、形成された水素および酸素を用いて、強磁性金属と反強磁性絶縁体との間で該活性層の結晶構造を変化させることを特徴とする半導体装置。 - 上記活性層は、強磁性金属と反強磁性絶縁体との間で、酸素含有率が変化することを特徴とする請求項1または2のいずれかに記載の半導体装置。
- 上記強磁性金属は、ペロブスカイト型構造のSrCoO3からなり、上記反強磁性絶縁体は、ブラウンミラライト型構造のSrCoO2.5からなることを特徴とする請求項1または2のいずれかに記載の半導体装置。
- 上記活性層は、ABOx(A:Ca、Sr、Ba、B:Co、Mn、Cr、Fe、Ni、2.0≦x3.5)で表される酸化物からなることを特徴とする請求項1または2のいずれかに記載の半導体装置。
- 上記多孔質誘電体は、12CaO・7Al2O3、CaO、Al2O3、12SrO・7Al2O3、Y2O3、HfO2、SiO2、MgO、NaTaO3、KTaO3、LaAlO3、ZrO2、MgAl2O4、Nb2O5、Ta2O5、Si3N4、SrTiO3、BaTiO3、CaTiO3、SrZrO3、CaZrO3BaZrO3、およびゼオライトからなるグループから選択される少なくとも1つの材料を含むことを特徴とする請求項1または2のいずれかに記載の半導体装置。
- 上記多孔質誘電体は、空孔率が5〜70体積%で、水分含有率が23〜100体積%の多孔質誘電体からなることを特徴とする請求項1または2のいずれかに記載の半導体装置。
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US10886466B2 (en) * | 2018-02-20 | 2021-01-05 | Hankuk University Of Foreign Studies Research Business Foundation | Variable resistor, non-volatile memory element using the same, and method of fabricating the same |
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