JP6050350B2 - Iii−vエピタキシャル層を成長させる方法および半導体構造 - Google Patents
Iii−vエピタキシャル層を成長させる方法および半導体構造 Download PDFInfo
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Description
感受性の生物学的要素、生物学的に生成された材料または生物模倣物;
生物学的な要素との分析物の相互作用から生じる信号を他の信号に変換する変換器または検出器の構成要素;ならびに、
付属する電子部品またはシグナルプロセッサから成る。
図1は、エピタキシャルな積層の断面を示す。
図2は、真正部分および外因性部分を備える半導体素子の断面を示す。
図3a−hは、本発明に係る半導体素子を製造する方法段階における断面を示す。
本発明において、エンハンスメントモードトランジスタ(例えばHEMTおよびJFET)が提供される。当該エンハンスメントモードトランジスタは、第1の活性な(InAl)GaN層(チャネル、図1における層1)、第2の活性なInAlGaN層(バリア、層2)、および保護積層を備えている。当該保護積層は、GaN蒸着層(層3)、Al(Ga)Nエッチング停止層(層4)およびSiNマスキング層(層5)を含んでいる。ここで、このAlGaNエッチング停止層(図3c)およびSiNマスキング層(図3b)は、素子のゲート領域において除去されている。p型(Al)GaNは、それからこの領域において、GaN蒸着層の蒸発(図3e)後に、選択的に再成長させられる(図3f)。保護積層が除去されていない部分において、上部のSiNマスキング層は、そこに成長を生じないようにする、選択的な再成長処理のためのマスクとして働く。また、保護積層は素子にとっての保護層として働く。
Claims (21)
- III−V半導体の構造を製造する方法であって、
基板を準備すること、
第1の活性なIII−V層を成長させ、第2の活性なIII−V層を成長させることによって当該2つの活性な層の間に2次元電子ガスを形成することを含んでいる、上記基板上にIII−V半導体の積層をエピタキシャルに成長させることによって、活性層を設けること、
上記活性層にとってのマスクとしての使用を目的とする保護積層を設けることを包含しており、
上記保護積層は、III−V蒸着層、当該蒸着層の上にあるIII−Vエッチング停止層、および当該エッチング停止層の上にあるマスク層を備えており、上記蒸着層は、2〜10nmの厚さを有しており、
ゲート領域における、上記マスク層および上記III−Vエッチング停止層を除去すること、および
上記第2の活性なIII−V層を露出するために、上記ゲート領域における上記III−V蒸着層を蒸発させることをさらに包含する、方法。 - 上記III−V蒸着層は、N、P、Asの1つ以上ならびにB、Al、Ga、InおよびTlの1つ以上を含んでいるか、および/または
上記III−Vエッチング停止層は、N、P、Asの1つ以上ならびにB、Al、Ga、InおよびTlの1つ以上を含んでいるか、および/または
上記エッチング停止層は、0.3〜100nmの厚さを有しているか、および/または
上記マスク層は、Si、Al、OおよびNの1つ以上を含んでいるか、および/または
上記マスク層は、1〜500nmの厚さを有している、請求項1に記載の方法。 - ゲートは、上記活性層上の上記保護積層を貫いて設けられており、当該ゲートは、III−V材料を含んでおり、当該ゲートは、選択的かつエピタキシャルに、好ましく再成長させられる、請求項1または2に記載の方法。
- オーム接触は、上記ゲートのp型のIII−V材料上に形成される、請求項3に記載の方法。
- 上記再成長はMOCVDによる、請求項3または4に記載の方法。
- フォトレジストマスクは、上記マスク層上に設けられ、ゲート領域は、画定される、請求項1〜5のいずれか1項に記載の方法。
- 上記ゲートは、N、P、Asの1つ以上ならびにB、Al、Ga、InおよびTlの1つ以上を含んでいる、請求項1〜6のいずれか1項に記載の方法。
- 上記基板は<111>Si基板であり、上記第1の活性なIII−V層はIII−N層であり、上記第2の活性なIII−V層はIII−N層である、請求項1〜7のいずれか1項に記載の方法。
- 上記第1の活性なIII−V層は、20〜500nmの厚さを有しているか、および/または
上記第2の活性なIII−V層は、10〜100nmの厚さを有しているか、および/または
上記第1の活性なIII−V層は、N、P、Asの1つ以上ならびにB、Al、Ga、InおよびTlの1つ以上を含んでいるか、および/または
上記第2の活性なIII−V層は、N、P、Asの1つ以上ならびにB、Al、Ga、InおよびTlの1つ以上を含んでいる、請求項8に記載の方法。 - ソースおよびドレインは、上記活性層上の上記保護積層を貫いて設けられており、
上記ゲートは、III−V材料を含んでおり、
上記ソースおよびドレインは、選択的かつエピタキシャルに、好ましく再成長させられる、請求項1または2に記載の方法。 - オーム接触は、上記ソースおよびドレインのn型のIII−V材料上に形成される、請求項10に記載の方法。
- 上記再成長はMOCVDによる、請求項10または11に記載の方法。
- フォトレジストマスクは、上記マスク層の上に設けられ、ゲート領域は、画定される、請求項1、2および10〜12のいずれか1項に記載の方法。
- 上記ソースおよびドレインは、N、P、Asの1つ以上ならびにB、Al、Ga、InおよびTlの1つ以上を含んでいる、請求項10〜12のいずれか1項に記載の方法。
- 第1の活性なIII−V層および第2の活性なIII−V層を含んでおり、当該2つの活性な層の間に2次元電子ガスを有している、活性層、
上記活性層にとってのマスクとして使用を目的とする保護積層を備えており、
上記保護積層は、III−V蒸着層、当該蒸着層の上にあるIII−Vエッチング停止層、および当該エッチング停止層の上にあるマスク層を備えており、上記蒸着層は、2nm〜10nmの厚さを有しており、
上記マスク層及び上記III−Vエッチング停止層は、ゲート領域において除去されており、
上記III−V蒸着層は、上記ゲート領域において蒸発しており、上記第2の活性なIII−V層を露出させている、III−V半導体構造。 - ゲートを備えており、当該ゲートは、III−V材料を含んでおり、III−Vゲートは、選択的かつエピタキシャルに再成長させられるゲートである、請求項15に記載の半導体構造。
- オーム接触は、上記ゲートのp型のIII−V材料上に形成される、請求項16に記載の半導体構造。
- ソースおよびドレインを備えており、当該ソースおよびドレインは、III−V材料を含んでおり、III−Vソースおよびドレインは、選択的かつエピタキシャルに再成長させられるソースおよびドレインである、請求項15に記載の半導体構造。
- オーム接触は、上記ソースおよびドレインのn型のIII−V材料上に形成される、請求項18に記載の半導体構造。
- トランジスタ、LED、ダイオードまたはパワーデバイスである、請求項15〜19のいずれか1項に記載の半導体構造を含んでいる、素子。
- 例えば電子回路、スイッチ、高出力の用途、高電圧の用途、画像センサ、バイオセンサ、集積化ロジックおよびイオンセンサ、請求項15〜19のいずれか1項に記載の半導体構造および/または請求項20に記載の素子を含んでいる、電子回路。
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