JP2021511279A - 可塑性半導体材料及びその製造方法 - Google Patents
可塑性半導体材料及びその製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 81
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- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
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- 229910052711 selenium Inorganic materials 0.000 claims abstract description 6
- 229910052714 tellurium Inorganic materials 0.000 claims abstract description 6
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- 229910052794 bromium Inorganic materials 0.000 claims abstract description 5
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 5
- 150000001875 compounds Chemical class 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
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Abstract
Description
Ag2-δXδS1-ηYη (I)
式中、0≦δ<0.5、0≦η<0.5である。
Xは、Cu、Au、Fe、Co、Ni、Zn、Ti及びVのうち少なくとも1つである。
Yは、N、P、As、Sb、Se、Te、O、Br、Cl、I及びFのうち少なくとも1つである。
得られた塊状固体を用いて粉末製造・焼結プロセスによって多結晶材料を作製し、または、得られた塊状固体を用いて坩堝降下法によって単結晶材料を成長させる工程。
Ag2-δXδS1-ηYη (I)。
式中、Xは、Cu、Au、Fe、Co、Ni、Zn、Ti及びVのうちいずれか1種、または複種を組み合わせたものであってよい。Yは、N、P、As、Sb、Se、Te、O、Br、Cl、I及びFのうちいずれか1種、または複種を組み合わせたものであってよい。X,Yをドーピングすることで、材料のバンドギャップや導電率などの特性が調整される。
図7は、実施形態1に係る可塑性半導体多結晶材料を製造するプロセスを示している。
図8は、実施形態2において単結晶可塑性半導体材料を製造するプロセスを示している。
Ag1.8Cu0.2S0.9Se0.1バルク多結晶材料
グローブボックス内で原料としてAg、Cu、S、Seの単体を1.8:0.2:0.9:0.1のモル比で準備した後、内壁に炭素膜が蒸着された石英管内に原料を封入し、真空引きしながらアルゴンプラズマ火炎で封止し、保護ガスとして石英管内にArガスを少量充填した。混合した原料を3°C/分の速度で900°Cまで昇温させて12時間溶融した。溶融完了後、焼入れ処理を行い、焼入れ媒体は塩水である。急冷して得られた結晶棒を石英管とともに500℃で100時間アニール処理し、バルクを細粉に粉砕し、焼結温度400°Cで、保温時間2分で、圧力30 MPaで放電プラズマ焼結を行ってAg1.8Cu0.2S0.9Se0.1バルク多結晶材料を得た。
Ag2S半導体材料結晶インゴット
グローブボックス内で原料としてAgとSの単体を2:1のモル比で準備した後、底部が尖った形状になっている石英坩堝内に原料を封入し、真空引きしながらアルゴンプラズマ火炎で封止し、保護ガスとして石英管内にArガスを少量充填した。混合した原料を1000°Cで12時間溶融し、冷却する。その後、石英管を結晶降下炉に入れて、定温領域の温度830°Cで、温度勾配2℃/cmで、坩堝の降下速度1mm/hで、Ag 2S半導体材料結晶インゴットを得て、その写真は図10に示されている。
グローブボックス内で原料としてAg、Zn、S、Iの単体を1.9:0.1:0.85:0.15のモル比で準備した後、内壁に炭素膜が蒸着された石英管内に原料を封入し、真空引きしながらアルゴンプラズマ火炎で封止し、保護ガスとして石英管内にArガスを少量充填した。混合した原料を0.5°C/分の速度で1000°Cまで昇温させて12時間溶融した。溶融完了後、焼入れ処理を行い、焼入れ媒体は塩水である。急冷して得られた結晶棒を石英管とともに450°Cで200時間アニール処理し、バルク固体を細粉に粉砕し、焼結温度380°Cで、保温時間5分で、圧力40 MPaで放電プラズマ焼結を行って、Ag1.9Zn0.1S0.85I0.15バルク多結晶材料を得た。
グローブボックス内で原料としてAg、Ni、S、Teの単体を1.85:0.15:0.6:0.4のモル比で準備した後、内壁に炭素膜が蒸着された石英管内に原料を封入し、真空引きしながらアルゴンプラズマ火炎で封止し、保護ガスとして石英管内にArガスを少量充填した。混合した原料を3°C/分の速度で850°Cまで昇温させて20時間溶融した。溶融完了後、徐冷した。徐冷して得られた結晶棒を石英管とともに550°Cで20時間アニール処理し、バルク固体を細粉に粉砕し、焼結温度300°Cで、昇温速度10℃/分で、保温時間30分、圧力30MPaでホットプレス焼結を行って、Ag1.85Ni0.15S0.6Te0.4バルク多結晶材料を得た。
Claims (10)
- 下記式(I)で表される輝銀鉱系化合物を含む、塑性変形能力を有する無機半導体材料。
Ag2-δXδS1-ηYη (I)
(式中、0≦δ<0.5、0≦η<0.5であり、XはCu、Au、Fe、Co、Ni、Zn、Ti及びVのうち少なくとも1つであり、YはN、P、As、Sb、Se、Te、O、Br、Cl、I及びFのうち少なくとも1つである。) - 前記無機半導体材料は、バンドギャップが0.5〜1.5eVの範囲内で調整可能であり、導電率が0.001〜250000 S/mの範囲内で調整可能であることを特徴とする、請求項1に記載の無機半導体材料。
- 前記無機半導体材料は、3%以上の引張変形量と、13%以上の曲げ変形量と、30 %以上の圧縮変形量とに耐えることができることを特徴とする、請求項1又は2に記載の無機半導体材料。
- 0≦δ<0.05、0≦η<0.05であり、または、0.1≦δ<0.5、0.1≦η<0.5であることを特徴とする、請求項1〜3のいずれか1項に記載の無機半導体材料。
- 前記半導体材料は、単結晶体または多結晶体であることを特徴とする、請求項1〜4のいずれか1項に記載の無機半導体材料。
- 前記多結晶体は、結晶粒度が1μm〜5mmの範囲内にあり、緻密度が95%以上であることを特徴とする、請求項5に記載の無機半導体材料。
- 不活性ガス雰囲気中または真空中で、原料を式(I)の化学量論比に従って850〜1200℃の温度で1〜20時間保温させることによって原料が均一に混合された溶体を形成した後、冷却によって塊状固体を得る工程と、
得られた塊状固体を用いて粉末製造・焼結プロセスによって多結晶材料を作製し、または、得られた塊状固体を用いて坩堝降下法によって単結晶材料を成長させる工程と、を備えることを特徴とする、請求項1〜6のいずれか1項に記載の無機半導体材料の製造方法。 - 前記冷却の後にアニール処理工程を更に含み、
好ましくは、アニール処理の温度が400〜650℃の範囲にあり、アニール処理の時間が1〜300時間の範囲にあることを特徴とする、請求項7に記載の製造方法。 - 前記焼結は、放電プラズマ焼結またはホットプレス焼結を用い、
好ましくは、焼結では、温度が100〜400℃の範囲にあり、圧力が10〜100MPaの範囲にあり、焼結の時間が5〜120分の範囲にあることを特徴とする、請求項7又は8に記載の製造方法。 - 前記坩堝降下法は、前記塊状固体が収容された坩堝を、結晶降下炉における温度が830℃〜950℃の範囲にある定温領域に配置する工程と、前記塊状固体が完全に溶けた後、0.1mm/h〜10mm/hの降下速度で前記坩堝を降下させ、温度勾配が1℃/cm〜100℃/cmに制御される工程と、を含むことを特徴とする、請求項7又は8に記載の製造方法。
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