JP4850858B2 - 半導体装置の作製方法 - Google Patents
半導体装置の作製方法 Download PDFInfo
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- JP4850858B2 JP4850858B2 JP2008024149A JP2008024149A JP4850858B2 JP 4850858 B2 JP4850858 B2 JP 4850858B2 JP 2008024149 A JP2008024149 A JP 2008024149A JP 2008024149 A JP2008024149 A JP 2008024149A JP 4850858 B2 JP4850858 B2 JP 4850858B2
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Description
特に、被照射面においてレーザビームの形状が線状であるレーザビーム(以下、線状ビームと表記する)を用いると、前後左右の走査が必要なスポット状のレーザビームを用いた場合とは異なり、線状ビームの線方向に直角な方向だけの走査で被照射面全体にレーザビームを照射することができるため、生産性が高い。線方向に直角な方向に走査するのは、それが最も効率の良い走査方向であるからである。この高い生産性により、レーザアニールには大出力のレーザを適当な光学系で加工した線状ビームを使用することが主流になりつつある。また、この線状ビームをその短尺方向に徐々にずらしながら重ねて照射することにより、非晶質シリコン膜全面に対しレーザアニールを行い、結晶化させたり、結晶性を向上させることができる。
また、比較のため、同じ図12に第1のレーザー光の照射のみを行ったnチャネル型TFTのオフ電流値における確率統計分布を●印でプロットして示す。図12の縦軸はパーセントを示しており、50%の値がオフ電流の平均値に相当する。また、横軸はオフ電流値を示しており、例えばバラツキが大きければ全プロットの占める領域、即ち横幅が大きくなる。第1のレーザー光のみを行ったnチャネル型TFT(●印)よりも、第2のレーザー光を行ったnチャネル型TFT(○印)のほうが、オフ電流値が低く(平均値においても低く)、バラツキも3pA〜20pA(p=10-12)と小さいことが図12から読み取れる。
、Vth(I−V特性グラフにおける立ち上がり点での電圧値)をそれぞれ100点測定し、それらの標準偏差を求めたグラフを図24、図25に示す。図24はnチャネル型TFT、図25はpチャネル型TFTである。
中でも安価なガスであるArが最適である。
図1(A)中、100は、絶縁表面を有する基板、101はブロッキング層となる絶縁膜、102は非晶質構造を有する半導体膜である。
塗布によるニッケル含有層103の形成方法以外の他の手段として、スパッタ法、蒸着法、またはプラズマ処理により極薄い膜を形成する手段を用いてもよい。
また、ここでは、全面に塗布する例を示したが、マスクを形成して選択的にニッケル含有層を形成してもよい。
と亜酸化窒素(N2O)、或いは、TEOSガスとN2O、或いはTEOSガスとN2OとO2を用い、10nm以下、好ましくは5nm以下の酸化窒化シリコン膜を形成する。この酸化窒化シリコン膜は、オゾン含有水溶液(代表的にはオゾン水)で得られる酸化膜(ケミカルオキサイドと呼ばれる)や、酸素雰囲気下の紫外線の照射でオゾンを発生させて結晶構造を有する半導体膜の表面を酸化して得られる酸化膜と比較して、結晶構造を有する第1の半導体膜との密着性が高く、後の工程(第2の半導体膜の形成)でピーリングが発生しない。さらに密着性を高くするために、バリア層の形成前にアルゴンプラズマ処理を行ってもよい。また、ゲッタリングさせる工程においても、上記膜厚範囲の酸化窒化シリコン膜であれば、金属元素がバリア層を通過してゲッタリングサイトに移動させることができる。
まず、ガラス基板上に下地絶縁膜(酸化窒化シリコン膜、膜厚150nm)を形成し、その上にプラズマCVD法により膜厚54nmの非晶質シリコン膜を形成した試料を用意した。次いで、ニッケルを重量換算で10ppm含む溶液を塗布した後、500℃、1時間の熱処理を行った後、さらに550℃、4時間の熱処理を行って結晶化させて結晶構造を有するシリコン膜を形成した。次いで、希フッ酸で半導体膜の表面を洗浄した後、大気または酸素雰囲気で第1のレーザー光(エキシマレーザ)を照射する。ここでの第1のレーザー光におけるエネルギー密度は476mJ/cm2とした。次いで、第1のレーザー光照射の際に形成された酸化膜を希フッ酸で除去した後、第2のレーザー光のエネルギー密度(476、507、537、567mJ/cm2)の条件を振って窒素雰囲気でそれぞれ照射してP―V値を測定して比較を行った。
)
ここでは、実施の形態1とは異なる工程順序で第2のレーザー光の照射を行う例を図3に示す。
なお、図3(A)は図1(A)に対応し、図3(B)は図1(B)に対応し、図3(C)は図1(C)に対応し、図3(D)は図1(D)に対応している。
この加熱処理は、電気炉の熱処理または強光の照射を用いればよい。電気炉の熱処理で行う場合は、500℃〜650℃で4〜24時間で行えばよい。ここでは脱水素化のための熱処理(500℃、1時間)の後、結晶化のための熱処理(550℃、4時間)を行って結晶構造を有するシリコン膜を得る。なお、ここでは炉を用いた熱処理を用いて結晶化を行ったが、ランプアニール装置で結晶化を行ってもよい。
とし、成膜パワーを3kWとし、基板温度を150℃とする。なお、上記条件での非晶質シリコン膜に含まれるアルゴン元素の原子濃度は、3×1020/cm3〜6×1020/cm3、酸素の原子濃度は1×1019/cm3〜3×1019/cm3である。その後、ランプアニール装置を用いて650℃、3分の熱処理を行いゲッタリングする。
電力を投入してプラズマを生成して117秒のエッチングを行う。基板側(試料ステージ)にも300WのRF(13.56MHz)電力を投入し、実質的に負の自己バイアス電圧を印加する。この第1のエッチング条件によりAl膜及びTi膜をエッチングして第1の導電層の端部をテーパー形状とする。
また、第2の形状の導電層328は画素部において保持容量を形成する一方の電極となる。さらに、第2の形状の導電層329は画素部においてソース配線を形成する。
ただし、本実施例では、第2の導電層としてアルミニウムを主成分とする材料を用いているので、水素化する工程において第2の導電層が耐え得る熱処理条件とすることが重要である。水素化の他の手段として、プラズマ水素化(プラズマにより励起された水素を用いる)を行っても良い。
本実施例では第1の層間絶縁膜をエッチングストッパーとして第2の層間絶縁膜をエッチングした後、絶縁膜(図示しない)をエッチングストッパーとして第1の層間絶縁膜をエッチングしてから絶縁膜(図示しない)をエッチングした。
を含む層に無機材料(シリコンまたは酸化シリコンなど)を含んでいてもよい。
アーム705は基板711の一端を掴み一軸方向に動かすことにより、前述の線状レーザー光を基板の全面に照射することが可能となる。搬送手段704は制御装置706によりレーザー700の発振と連動して動作させる。
Claims (5)
- シリコンの結晶化を助長する金属元素を用いて結晶化された第1のシリコン膜を形成し、
第1のレーザー光の照射領域が酸素を含む雰囲気となる第1の状態において、前記第1のシリコン膜に前記第1のレーザー光を照射して結晶性を向上し、
前記第1のレーザー光を照射した際に前記第1のシリコン膜上に形成される酸化シリコン膜を用いたバリア層上に、希ガス元素を含み且つ非晶質構造を有する第2のシリコン膜を形成し、
加熱処理を行うことによって、前記第1のシリコン膜に含まれる前記金属元素を、前記第2のシリコン膜にゲッタリングし、
前記バリア層をエッチングストッパーとして用いて前記第2のシリコン膜を除去し、
前記バリア層を除去し、
第2のレーザー光の照射領域が不活性気体雰囲気となる第2の状態において、前記第1のシリコン膜に前記第2のレーザー光を照射して表面の平坦性を向上することを特徴とする半導体装置の作製方法。 - シリコンの結晶化を助長する金属元素を用いて結晶化された第1のシリコン膜を形成し、
第1のレーザー光の照射領域が酸素を含む雰囲気となる第1の状態において、前記第1のシリコン膜に前記第1のレーザー光を照射して結晶性を向上し、
前記第1のレーザー光を照射した際に前記第1のシリコン膜上に形成される第1の酸化シリコン膜を除去し、
前記第1のシリコン膜上に、第2の酸化シリコン膜からなるバリア層を形成し、
前記バリア層上に、希ガス元素を含み且つ非晶質構造を有する第2のシリコン膜を形成し、
加熱処理を行うことによって、前記第1のシリコン膜に含まれる前記金属元素を、前記第2のシリコン膜にゲッタリングし、
前記バリア層をエッチングストッパーとして用いて前記第2のシリコン膜を除去し、
前記バリア層を除去し、
第2のレーザー光の照射領域が不活性気体雰囲気となる第2の状態において、前記第1のシリコン膜に前記第2のレーザー光を照射して表面の平坦性を向上することを特徴とする半導体装置の作製方法。 - 請求項1又は請求項2において、
前記第2のレーザー光を照射した後、前記第1のシリコン膜を所望の形状のシリコン層に加工し、
前記シリコン層上にゲート絶縁膜を形成することを特徴とする半導体装置の作製方法。 - 請求項1乃至請求項3のいずれか一項において、
前記第1のレーザー光の照射領域に酸素を含むガスを吹き付けながら、前記第1のレーザー光を照射することによって、前記第1の状態とすることを特徴とする半導体装置の作製方法。 - 請求項1乃至請求項4のいずれか一項において、
前記第2のレーザー光の照射領域に不活性気体ガスを吹き付けながら、前記第2のレーザー光を照射することによって、前記第2の状態とすることを特徴とする半導体装置の作製方法。
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JP2008182250A (ja) | 2008-08-07 |
US20020187594A1 (en) | 2002-12-12 |
US20080138963A1 (en) | 2008-06-12 |
US7655513B2 (en) | 2010-02-02 |
US6855584B2 (en) | 2005-02-15 |
US20050112850A1 (en) | 2005-05-26 |
US7015083B2 (en) | 2006-03-21 |
US20060183276A1 (en) | 2006-08-17 |
US7291523B2 (en) | 2007-11-06 |
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