JP2016058668A - 半導体製造方法および半導体製造装置 - Google Patents
半導体製造方法および半導体製造装置 Download PDFInfo
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Abstract
【解決手段】金属層が形成された半導体基板Wの表面にフラッシュランプFLから1秒以下の照射時間にてフラッシュ光を照射することによって、金属層および不純物領域を含む半導体基板Wの表面を瞬間的に1000℃以上の処理温度にまで昇温している。また、水素を含むフォーミングガスの雰囲気中にて半導体基板Wの表面にフラッシュ光を照射して加熱処理を行っている。フォーミングガス雰囲気中にて半導体基板Wの表面を極めて短時間で高温に加熱することにより、ゲート酸化膜の界面近傍に水素終端のために取り込まれていた水素を脱離させることなく、コンタクト抵抗を低下させることができる。
【選択図】図1
Description
図1は、本発明に係る半導体製造装置1の構成を示す縦断面図である。本実施形態の半導体製造装置1は、SiC(シリコンカーバイド)の半導体基板Wに対してフラッシュ光を照射することによってコンタクト形成のためのPDA(Post-Deposition Anneal)を行うフラッシュランプアニール装置である。詳細は後述するが、半導体製造装置1に搬入される前の半導体基板Wには不純物領域上に金属層が形成されており、半導体製造装置1による加熱処理によって金属層と不純物領域とのコンタクトが形成される。
次に、本発明の第2実施形態について説明する。第2実施形態の半導体製造装置の構成は第1実施形態と全く同じである。また、第2実施形態における処理手順についても概ね第1実施形態と同様である。図12は、第2実施形態のコンタクト形成の処理手順を示すフローチャートである。
次に、本発明の第3実施形態について説明する。第3実施形態の半導体製造装置の構成は第1実施形態と全く同じである。また、第3実施形態における処理手順についても概ね第1実施形態と同様である。図13は、第3実施形態のコンタクト形成の処理手順を示すフローチャートである。
次に、本発明の第4実施形態について説明する。第4実施形態の半導体製造装置の構成は第1実施形態と全く同じである。また、第4実施形態における処理手順についても概ね第1実施形態と同様である。第4実施形態が第1実施形態と相違するのは、半導体基板Wの一方面にp型コンタクトとn型コンタクトとを同時に形成する点である。
以上、本発明の実施の形態について説明したが、この発明はその趣旨を逸脱しない限りにおいて上述したもの以外に種々の変更を行うことが可能である。例えば、上記第1実施形態においては、フラッシュランプFLからのフラッシュ光を透過するランプ光放射窓53および上側チャンバー窓63を合成石英にて形成することによって、バンドギャップの広いSiCの半導体基板Wに照射されるフラッシュ光に紫外域の光を多く含ませるようにしていたが、紫外域成分を多くする手法はこれに限定されるものではない。例えば、フラッシュランプFL自体の構造(例えば、封入するガスの組成や圧力)または発光時間を調整することによって出射するフラッシュ光に含まれる紫外域の成分を増加させるようにしても良い。いずれの手法であっても、半導体基板Wに照射されるフラッシュ光の分光分布が波長500nmに対する波長300nmの相対強度が20%以上となるようにすれば良い。
2 シャッター機構
3 制御部
4 ハロゲン加熱部
5 フラッシュ加熱部
6 チャンバー
7 保持部
10 移載機構
61 チャンバー側部
62 凹部
63 上側チャンバー窓
64 下側チャンバー窓
65 熱処理空間
74 サセプター
91 トリガー電極
92 ガラス管
93 コンデンサ
94 コイル
96 IGBT
97 トリガー回路
111 基材
112 不純物領域
113 層間絶縁膜
114 金属層
115 光吸収膜
180 フォーミングガス供給機構
FL フラッシュランプ
HL ハロゲンランプ
W 半導体基板
Claims (20)
- 半導体基板のコンタクトを形成する半導体製造方法であって、
半導体基板の一部領域にイオンを注入して不純物領域を形成するイオン注入工程と、
前記不純物領域上に金属層を形成する金属層形成工程と、
前記金属層が形成された前記半導体基板に1秒以下の照射時間にて光を照射して加熱する熱処理工程と、
を備え、
前記熱処理工程は、水素を含むフォーミングガス中にて実行されることを特徴とする半導体製造方法。 - 請求項1記載の半導体製造方法において、
前記熱処理工程にて光が照射される前記半導体基板の表面の到達温度は1000℃以上であることを特徴とする半導体製造方法。 - 請求項1または請求項2記載の半導体製造方法において、
前記熱処理工程では、コンタクト形成とともに前記不純物領域に注入された不純物の活性化も行うことを特徴とする半導体製造方法。 - 請求項3記載の半導体製造方法において、
前記熱処理工程では、さらに前記不純物領域の再結晶化を促進することを特徴とする半導体製造方法。 - 請求項1または請求項2記載の半導体製造方法において、
前記イオン注入工程と前記金属層形成工程との間に、半導体基板に1秒以下の照射時間にて光を照射して前記不純物領域に注入された不純物の活性化を行う工程をさらに備えることを特徴とする半導体製造方法。 - 請求項1から請求項5のいずれかに記載の半導体製造方法において、
前記熱処理工程では、分光分布にて波長500nmに対する波長300nmの相対強度が20%以上である光を前記半導体基板に照射することを特徴とする半導体製造方法。 - 請求項1から請求項6のいずれかに記載の半導体製造方法において、
前記熱処理工程の前に、前記金属層上に光吸収膜を形成する工程をさらに備えることを特徴とする半導体製造方法。 - 請求項1から請求項7のいずれかに記載の半導体製造方法において、
前記イオン注入工程では、前記半導体基板の一方面にn型不純物領域とp型不純物領域とを形成し、
前記金属層形成工程では、前記n型不純物領域上にニッケル層を形成するとともに、前記p型不純物領域上にアルミニウム層を形成し、
前記熱処理工程では、前記半導体基板の前記一方面への光照射によってn型コンタクトとp型コンタクトとを同時に形成することを特徴とする半導体製造方法。 - 請求項1から請求項8のいずれかに記載の半導体製造方法において、
前記熱処理工程では、フラッシュランプから前記半導体基板にフラッシュ光を照射することを特徴とする半導体製造方法。 - 請求項1から請求項9のいずれかに記載の半導体製造方法において、
前記半導体基板はシリコンカーバイドにて形成されていることを特徴とする半導体製造方法。 - 半導体基板のコンタクトを形成する半導体製造装置であって、
イオンが注入された不純物領域上に金属層が形成された半導体基板を収容するチャンバーと、
前記チャンバー内に設置され、前記半導体基板を載置して支持するサセプターと、
前記チャンバー内に、水素を含むフォーミングガスの雰囲気を形成するフォーミングガス供給部と、
前記サセプターに支持された前記半導体基板に1秒以下の照射時間にて光を照射して加熱する光照射部と、
を備え、
前記光照射部は、前記フォーミングガス中にて前記半導体基板に光を照射することを特徴とする半導体製造装置。 - 請求項11記載の半導体製造装置において、
前記光照射部は、光照射によって前記半導体基板の表面を1000℃以上に到達させることを特徴とする半導体製造装置。 - 請求項11または請求項12記載の半導体製造装置において、
前記光照射部は、前記半導体基板に光を照射してコンタクト形成とともに前記不純物領域に注入された不純物の活性化も行うことを特徴とする半導体製造装置。 - 請求項13記載の半導体製造装置において、
前記光照射部は、前記半導体基板に光を照射してさらに前記不純物領域の再結晶化を促進することを特徴とする半導体製造装置。 - 請求項11または請求項12記載の半導体製造装置において、
前記光照射部は、イオンが注入された後であって金属層が形成される前の半導体基板に光を照射して前記不純物領域に注入された不純物の活性化を行うことを特徴とする半導体製造装置。 - 請求項11から請求項15のいずれかに記載の半導体製造装置において、
前記光照射部は、分光分布にて波長500nmに対する波長300nmの相対強度が20%以上である光を前記半導体基板に照射することを特徴とする半導体製造装置。 - 請求項11から請求項16のいずれかに記載の半導体製造装置において、
前記光照射部は、前記金属層上に光吸収膜を形成した前記半導体基板に光を照射することを特徴とする半導体製造装置。 - 請求項11から請求項17のいずれかに記載の半導体製造装置において、
前記半導体基板の一方面にn型不純物領域とp型不純物領域とが形成されるとともに、前記n型不純物領域上および前記p型不純物領域上にそれぞれニッケル層およびアルミニウム層が形成され、
前記光照射部は、前記半導体基板の前記一方面への光照射によってn型コンタクトとp型コンタクトとを同時に形成することを特徴とする半導体製造装置。 - 請求項11から請求項18のいずれかに記載の半導体製造装置において、
前記光照射部は、フラッシュランプを照射するフラッシュランプを含むことを特徴とする半導体製造装置。 - 請求項11から請求項19のいずれかに記載の半導体製造装置において、
前記半導体基板はシリコンカーバイドにて形成されていることを特徴とする半導体製造装置。
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