JP4805648B2 - 半導体薄膜及びその製造方法 - Google Patents
半導体薄膜及びその製造方法 Download PDFInfo
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- 239000010409 thin film Substances 0.000 title claims description 108
- 239000004065 semiconductor Substances 0.000 title claims description 66
- 238000004519 manufacturing process Methods 0.000 title claims description 27
- 239000010408 film Substances 0.000 claims description 44
- 238000010438 heat treatment Methods 0.000 claims description 37
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 25
- 239000001301 oxygen Substances 0.000 claims description 25
- 229910052760 oxygen Inorganic materials 0.000 claims description 25
- 229910003437 indium oxide Inorganic materials 0.000 claims description 24
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 claims description 24
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 19
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 19
- 230000015572 biosynthetic process Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 13
- 239000013078 crystal Substances 0.000 claims description 10
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052684 Cerium Inorganic materials 0.000 claims description 5
- 239000002178 crystalline material Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims 1
- 238000002834 transmittance Methods 0.000 description 12
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 4
- 229910001195 gallium oxide Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000011787 zinc oxide Substances 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 238000005477 sputtering target Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical group [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 229910001954 samarium oxide Inorganic materials 0.000 description 2
- 229940075630 samarium oxide Drugs 0.000 description 2
- FKTOIHSPIPYAPE-UHFFFAOYSA-N samarium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[Sm+3].[Sm+3] FKTOIHSPIPYAPE-UHFFFAOYSA-N 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
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Description
この薄膜は、スイッチング素子の性能、製造工程に大きな影響を与えるので、従来からその組成や製造方法等、種々の技術的検討が行われている。
現在、表示装置を駆動させるスイッチング素子としては、シリコン系の半導体膜を用いた素子が主流を占めている。それは、シリコン系薄膜の安定性、加工性の良さの他、スイッチング速度が速い等、種々の性能が良好なためである。このシリコン系薄膜は、一般に化学蒸気析出法(CVD)法により製造されている。
・酸化インジウムと酸化ガリウム
・酸化亜鉛
・酸化亜鉛と酸化マグネシウム
からなる透明半導体膜は、移動度が、高くても10cm2/V・sec程度であり、アモルファスSiに比べれば大きいものの、ポリSi(ポリシリコン)に比べれば非常に小さい値であった。また、加熱等により移動度が変化し半導体の動作不良を起こしたり、光が半導体層に入射した場合誤作動したりする場合があった。
前記半導体薄膜の比抵抗の好ましい値は、10+1〜10+7Ωcmである。より好ましくは、比抵抗が10+2〜10+6Ωcmである。
なお、Ce/(Ce+In)の式は、各々の原子の数の比、すなわち、全体組成に対するセリウム原子の原子比を表す式である。この式中のCeはセリウムの原子の数、Inはインジウムの原子の数を表す。
第三成分としての正三価の金属酸化物の添加量は、性能に影響しない量であれば問題ないが、好ましくは、第三成分の原子比、すなわち「第三成分/(Ce+In+第三成分」の式の値が、0.01から0.1の範囲である。より好ましくは、この原子比が0.01から0.05である。
この第三成分の原子比が0.1超では、薄膜が結晶化しない場合や加熱時に比抵抗が安定化しない場合等がある。
ここで、酸素濃度が30vol.%超では、スパッタ時のプラズマが安定しなかったり、異常放電を起こす場合がある。酸素濃度のより好ましい数値範囲は10vol.%〜20vol.%の範囲である。
このような数値範囲に設定することによって、酸素濃度の値を制御して酸化物半導体中のキャリア密度を10+18/cm3未満に調整できる。また、移動度は、10cm2/V・sec超となり、半導体薄膜として好適である。より好ましくは、前記酸化物半導体中のキャリア密度を10+17/cm3未満、移動度は、10cm2/V・sec超にするとよい。
まず、ターゲットサンプル1を作成する。
図1に示すように、サンプル1は、酸化インジウムと酸化セリウムとのモル比が0.01のターゲットである。
また、サンプル2は、酸化インジウムと酸化セリウムとのモル比が0.03のターゲットである。
また、サンプル3は、酸化インジウムと酸化セリウムとのモル比が0.05のターゲットである。
また、サンプル4は、酸化インジウムと酸化セリウムとのモル比が0.1のターゲットである。
また、サンプル5は、酸化インジウムと酸化セリウムとのモル比が0.02であるが、さらに第三成分として酸化サマリウムが添加されている。この酸化サマリウムの添加量は、Sm/(In+Ce+Sm)で表されるモル比が0.01になる量とした。
また、サンプル6は、酸化インジウムと酸化セリウムとのモル比が0.02であるが、さらに第三成分として酸化ガリウムが添加されている。この酸化ガリウムの添加量は、Ga/(In+Ce+Ga)で表されるモル比が0.01になる量とした。
また、サンプル7は、酸化インジウムと酸化セリウムとのモル比が0のターゲットである。すなわち、全て酸化インジウムである。
また、サンプル8は、酸化インジウムと酸化セリウムとのモル比が0.5のターゲットである。
以上、ターゲットサンプル1〜ターゲットサンプル8の合計8種を作成した。
次に、 スパッタリング装置に、上記(1)で得たターゲットを装着する。そして、一旦、真空度10−4Paまで真空に引いた後、アルゴンガス及び酸素を導入して0.3Paに調整する。次に、RFマグネトロンスパッタリング法により、パワー100Wを加えて、試料上に200nmの薄膜を製造した。その薄膜の製造条件、及び、薄膜の測定値を図2の表に示す。また、結晶化の有無の測定方法については、X線回析法によって行う。
Claims (8)
- 酸化インジウムと酸化セリウムとを含有し、結晶質からなる半導体薄膜であって、前記半導体薄膜中のセリウム原子比が、Ce/(Ce+In)=0.005〜0.1であり、かつ、前記半導体薄膜の比抵抗が10+1〜10+8Ωcmであることを特徴とする半導体薄膜。
- 前記半導体薄膜中のセリウム原子比が、Ce/(Ce+In)=0.01〜0.05であることを特徴とする請求項1記載の半導体薄膜。
- 前記半導体薄膜が、酸化インジウムのビックスバイト型結晶であることを特徴とする請求項1〜2のいずれかに記載の半導体薄膜。
- 酸化インジウム及び酸化セリウムとを含有するターゲットを用いて、物理成膜法により薄膜を製造する方法にて、成膜中の雰囲気中の酸素濃度が5vol.%超にて成膜することを特徴とする請求項1〜3のいずれかに記載の半導体薄膜の製造方法。
- 上記成膜中の雰囲気中の酸素濃度が10vol.%〜30vol.%の範囲内において成膜することを特徴とする請求項4記載の半導体薄膜の製造方法。
- 上記成膜中の雰囲気中の酸素濃度が10vol.%〜20vol.%の範囲内において成膜することを特徴とする請求項4又は5記載の半導体薄膜の製造方法。
- 酸化インジウム及び酸化セリウムを含有するターゲットを用いて、物理成膜法によって薄膜を製造する方法にて、成膜中の基板温度を150℃以上の温度にて成膜することを特徴とする請求項1〜3のいずれかに記載の半導体薄膜の製造方法。
- 酸化インジウム及び酸化セリウムを含有するターゲットを用いて、物理成膜法によって薄膜を製造する方法にて、成膜後の基板を200℃以上の温度で加熱することを特徴とする請求項1〜3のいずれかに記載の半導体薄膜の製造方法。
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US12/090,731 US8062777B2 (en) | 2005-10-19 | 2006-08-07 | Semiconductor thin film and process for producing the same |
KR1020087009320A KR101347966B1 (ko) | 2005-10-19 | 2006-08-07 | 반도체 박막 및 그의 제조 방법 |
PCT/JP2006/315585 WO2007046181A1 (ja) | 2005-10-19 | 2006-08-07 | 半導体薄膜及びその製造方法 |
CN2006800280951A CN101233257B (zh) | 2005-10-19 | 2006-08-07 | 半导体薄膜及其制造方法 |
EP06782427A EP1939319A4 (en) | 2005-10-19 | 2006-08-07 | SEMICONDUCTOR THIN FILM AND METHOD FOR PRODUCING THE SAME |
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JP2009231549A (ja) | 2008-03-24 | 2009-10-08 | Toyoda Gosei Co Ltd | 窒化物系半導体発光素子 |
US9269573B2 (en) * | 2008-09-17 | 2016-02-23 | Idemitsu Kosan Co., Ltd. | Thin film transistor having crystalline indium oxide semiconductor film |
KR20120074276A (ko) * | 2009-09-17 | 2012-07-05 | 산요덴키가부시키가이샤 | 투명 도전막 및 이것을 구비한 장치 |
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CN101233257B (zh) | 2010-09-22 |
WO2007046181A1 (ja) | 2007-04-26 |
JP2007113048A (ja) | 2007-05-10 |
KR20080057297A (ko) | 2008-06-24 |
US20090127548A1 (en) | 2009-05-21 |
EP1939319A4 (en) | 2009-10-21 |
TW200717598A (en) | 2007-05-01 |
EP1939319A1 (en) | 2008-07-02 |
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US8062777B2 (en) | 2011-11-22 |
KR101347966B1 (ko) | 2014-01-07 |
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