JP5363343B2 - 多結晶半導体材料層の低温形成 - Google Patents
多結晶半導体材料層の低温形成 Download PDFInfo
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- H01L21/02365—Forming inorganic semiconducting materials on a substrate
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- H01L21/02365—Forming inorganic semiconducting materials on a substrate
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Description
少なくとも1つの触媒粒子を基板上に提供する工程であって、少なくとも1つの触媒粒子は少なくとも1つの触媒材料を含み、触媒材料は室温と500℃の間の溶融温度を有し、または室温と500℃との間の共晶温度を有する触媒材料/半導体材料の合金を形成することができる触媒材料である工程と、
前駆体ガスのプラズマ強化で、500℃より低い温度で基板上に多結晶半導体材料層を形成し、これにより少なくとも1つの触媒粒子を開始剤(initiator)として用いる工程と、を含む。
少なくとも1つの触媒粒子を基板上に提供する工程であって、少なくとも1つの触媒粒子は、少なくとも1つの触媒材料を含み、触媒材料は、室温と500℃の間の溶融温度を有し、または室温と500℃との間の共晶温度を有する触媒材料/半導体材料の合金を形成する工程と、
前駆体ガスのプラズマ強化で、少なくとも1つの触媒粒子を開始剤として用いて、500℃より低い温度で基板上に多結晶半導体材料層を形成する工程と、を含む。
例えばシリコンテクノロジのような半導体テクノロジと互換性を有し、および/または
熱力学的にVLS(気相−液相−固相)成長に好ましく、即ち半導体材料と中間化合物を形成せず、例えば100℃と500℃の間のような室温と500℃との間の低い溶融温度を有し、または室温と500℃との間の共晶温度を有する触媒材料/半導体材料の合金を形成し、更に、半導体材料が例えば5at%より低いような、30at%より少ない低溶解度を有する触媒材料/半導体材料の合金(半導体材料がSiまたはGeの場合、Ga、In、Tl、Bi、Sn、Cd、Pd、またはZn)を形成する。
触媒粒子に前駆体ガスを輸送する工程(図2中に矢印5で表示)、
触媒粒子でガスを分解する工程、
例えばプラズマ有りまたはプラズマ無しで多結晶半導体材料の形成が行われる温度と同じ温度でのアニールのような、成長プロセスと共にその場で行われる選択的な前処理工程、
例えば金属(Me)粒子のような触媒粒子に、例えばSiのような半導体材料をくっつけて、例えばSiのような半導体材料を拡散させて、例えば液体Si−Me合金のような合金を形成する工程、および
例えば金属粒子のような触媒粒子と、例えばSiのような半導体材料の2次元(2D)析出物の結晶を過飽和にする工程、を含む。
(1)
例によれば、インジウム(In)は、触媒材料として使用される。Inは160℃の溶融温度を有し、多結晶シリコン層6の形成のためのこの実験で使用される300℃の温度では液体状態である。
1)108〜109粒子/cm2のオーダーの密度で、1nmと200nmの間の直径を有する触媒粒子4を堆積
2)2分間で300℃まで加熱
3)H2予備洗浄、200sccm、P=1000mTorr、RF=100W、1分
4)10mTorrまで吸引
5)プラズマ堆積
a.SiH4=20sccm、H2=10sccm、
Ar=10sccm(2:1:1)
b.P=500mTorr
c.RF=20W
d.T=300℃
e.時間=10分
6)10mTorrまで吸引
Claims (12)
- 基板(1)の上に多結晶半導体材料層(6)を形成する方法であって、
基板(1)の上に少なくとも1つの触媒粒子(4)を提供する工程であって、少なくとも1つの触媒粒子(4)は、Ga、In、Tl、Bi、Sn、Cd、Pd、及びZnのいずれかで構成される触媒粒子の群の中から選択された触媒材料を含む工程と、
該触媒材料と半導体材料とを用いて触媒材料/半導体材料の合金を形成する工程と、
500℃より低い温度で、半導体材料源からなる前駆体ガスのプラズマ強化によるVLS成長法を用いて基板(1)の上に多結晶半導体材料層(6)を形成し、これにより少なくとも1つの触媒材料(4)を開始剤として用いる工程であって、該前駆体ガスから形成された該半導体材料は、触媒材料/半導体材料の合金中で、30at%以下の低い溶解度を有する工程と、を含む方法。 - 更に、前駆体ガスにH2を加える工程を含む請求項1に記載の方法。
- 基板(1)の上に多結晶半導体材料層(6)を形成する工程は、160℃と350℃との間の温度で行われる請求項1または2に記載の方法。
- 更に、不活性ガスを前駆体ガスに加える工程を含む請求項1〜3のいずれかに記載の方法。
- プラズマ強化は、10Wと40Wの間の電力を用いた高電力プラズマであるプラズマを用いる請求項1〜4のいずれかに記載の方法。
- 触媒材料は、触媒材料/半導体材料の合金を形成し、この合金中で、前駆体ガスからの半導体材料は0.004at%と30at%の間の低い溶解度を有する請求項1〜5のいずれかに記載の方法。
- 更に、多結晶半導体材料層(6)中にドーパント元素を供給する工程を含む請求項1〜6のいずれかに記載の方法。
- 触媒材料(4)は、更に、少なくとも1つのドーパント元素を含み、ドーパント元素を供給する工程は、多結晶シリコンの形成中に、少なくとも1つのドーパント元素を多結晶シリコン中に実質的に完全に溶かすことにより行われる請求項7に記載の方法。
- ドーパント元素を供給する工程は、少なくとも1つのドーパント元素を、前駆体ガスに組み込むことにより行われる請求項8に記載の方法。
- プラズマは、直接プラズマまたは遠隔プラズマである請求項1〜9のいずれかに記載の方法。
- 半導体デバイスの製造プロセスに対する、請求項1〜10のいずれかに記載の方法の使用。
- 請求項1〜10のいずれかに記載の方法を用いて基板の上に形成された多結晶半導体材料層(6)。
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US20090297774A1 (en) * | 2008-05-28 | 2009-12-03 | Praveen Chaudhari | Methods of growing heterepitaxial single crystal or large grained semiconductor films and devices thereon |
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JP3229749B2 (ja) * | 1994-05-30 | 2001-11-19 | 三洋電機株式会社 | 多結晶半導体薄膜の製造方法及び光起電力装置 |
JP3432187B2 (ja) * | 1999-09-22 | 2003-08-04 | シャープ株式会社 | 半導体装置の製造方法 |
JP2001223162A (ja) * | 2000-02-09 | 2001-08-17 | Hitachi Cable Ltd | 結晶シリコン半導体装置およびその製造方法 |
US7252811B2 (en) | 2000-06-29 | 2007-08-07 | University Of Louisville | Low temperature synthesis of silicon fibers |
JP4093344B2 (ja) * | 2002-03-25 | 2008-06-04 | 財団法人新産業創造研究機構 | ナノ微細構造体の製造方法 |
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2008
- 2008-02-19 US US12/524,151 patent/US7964479B2/en active Active
- 2008-02-19 WO PCT/EP2008/052018 patent/WO2008101931A2/en active Application Filing
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WO2008101931A3 (en) | 2008-11-13 |
US7964479B2 (en) | 2011-06-21 |
JP2010519727A (ja) | 2010-06-03 |
US20110045662A1 (en) | 2011-02-24 |
EP2122667A2 (en) | 2009-11-25 |
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