JP5400795B2 - 基板処理方法及び基板処理装置 - Google Patents
基板処理方法及び基板処理装置 Download PDFInfo
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Description
次に、本発明を実施するための最良の形態について、以下に説明する。
図1、図2を参照しながら、本発明の第1の実施形態による成膜装置について説明する。図1は、本実施形態における成膜装置の断面図であり、図2は、本実施形態における成膜装置の反応ガス及び成膜ガスが供給される部分の平面図である。
次に、第1の実施形態の変形例1による成膜装置について説明する。変形例1の成膜装置は、選択壁17が設けられていない点で、図1から図9に示した成膜装置と相違する。
図11に示す成膜装置では、各々の触媒112から噴出されるH2Oガスの噴出口114が複数設けられている。このように、複数の噴出口114を設けることにより、より均一な成膜が可能となる。
次に、第1の実施形態の変形例2による成膜方法について説明する。具体的には、この変形例2の成膜方法により、窒化物膜等の化合物膜を成膜する場合を説明する。
(1)2N2H4 → 2NH* 3+H* 2
(2) NH3 → NH* + H* 2,NH* 2 + H
上記のように、本変形例においては、触媒反応装置5内にヒドラジン及び窒素酸化物から選択された1種以上の窒素供給ガスを導入し、微粒子状の触媒と接触させて得られた高いエネルギーを有する反応ガスを触媒反応装置から噴出させて有機金属化合物ガスと反応させることによって、大量の電気エネルギーを必要とせずに、各種の基板上に低コストで効率良く金属窒化物膜を形成することができる。このような、大量の発熱を伴う化学反応は、窒素供給ガスとして特定のガスを選択し、微粒子状の触媒を使用することによって、実現することができたものである。
(変形例3)
次に、第1の実施形態の変形例3による成膜方法について説明する。変形例3の成膜方法においては、特にH2ガスとO2ガスが分離して間欠的に供給される。
最初に、図17(a)に示すように、H2ガスを導入する。これにより、本実施形態において用いられる触媒であるPt触媒212の表面に吸着している物質を還元しクリーニングを行なうと共に、Pt触媒212表面にH原子を化学結合させる。
O2ガスを導入することにより、図17(d)に示すように、O原子がPt触媒212に化学吸着し、O原子、H原子はともにPt触媒表面でマイグレーションする。
次に、第1の実施形態の変形例4による成膜方法について説明する。変形例4の成膜方法においては、H2ガスとO2ガスを供給するタイミングと、成膜ガスを供給するタイミングが、変形例3の成膜方法におけるタイミングと異なる。
図21に示すように、最初に、制御バルブ66を開きH2ガスを導入し、その後、制御バルブ65を開きO2ガスを導入する。これにより、触媒反応容器11内で高温のH2Oガスが効率よく生成される。
この後、制御バルブ67を開き成膜ガスを導入し、生成された高温のH2Oガスとの主に気相中における反応により基板22上に成膜を行なう。
この後、制御バルブ67を閉じ、成膜ガスの供給を停止する。
この工程を繰返し行なうことにより成膜が行なわれる。このような成膜プロセスにより、品質の高い膜を得ることができる。尚、この制御は、制御手段68により制御バルブ65、66、67の開閉及び流量の制御を通して行なわれる。
通常のALD(Atomic Layer Deposition)法により成膜した酸化物等からなる高誘電体膜中には炭素や水素等の不純物及び酸素の空孔が含まれており、これらによりトラップや固定電荷が形成されるため、トランジスタの電気的特性が損なわれる。不純物や酸素の空孔を低減する方法としては、様々な方法があるが、いずれも装置コストが高くなる、又は、プロセスが複雑になるという問題点を有していた。
本実施形態では、コストの低い装置で、短時間に良質な酸化物膜を得ることができる。
第2の実施形態は、本発明に係る基板処理方法及び基板処理装置に関する。
(有機物除去方法及び装置)
最初に、本実施形態に係る基板処理方法の一種である有機物の除去方法について、発明に至った経緯等を含め説明する。
平均粒径0.3mmのγ−Al2O3担体に1.0gの塩化白金酸六水和物0.27gを含浸により担持し、大気中450℃において4時間焼成することにより、触媒312となる10wt%Pt/γ−Al2O3触媒を得ることができる。この触媒312を触媒反応部310内に、約0.02g充填し、金属メッシュ316により覆った後、チャンバー320内に設置する。
次に、本実施の形態である基板処理方法の一種であるポリシリコン、アモルファスシリコン、微結晶シリコン等からなるシリコン膜の膜質改善方法について説明する。これらのシリコン膜の膜厚は、例えば、0.01〜10μm程度である。
次に、本実施形態である基板処理方法の一種である酸化膜の膜質改善方法について説明する。この方法は、酸素欠損している酸化膜において酸素を供給し、化学量論比どおりの膜を形成する酸化膜の膜質改善方法である。この酸化膜は、例えば酸化亜鉛、ITO(Indium Tin Oxide)等の透明導電膜や、IGZO(Indium Gallium Zinc Oxide)、酸化亜鉛等の半導体膜や、酸化ハフニウム、酸化タンタル等の誘電体膜であって良い。
次に、本実施形態である基板処理方法の一種であるSi基板の表面に酸化膜を形成する酸化膜形成方法について説明する。
次に、第2の実施形態の変形例1による基板処理方法について説明する。変形例1の基板処理方法は、H2ガスとO2ガスとを分離して供給する触媒反応部を有する装置において好適に実施される。
次に、第2の実施形態の変形例2による基板処理方法について説明する。変形例2による基板処理方法は、複数の触媒反応部を有する装置において好適に実施することができる。図31を参照しながら、本変形例の基板処理方法に好適な装置について説明する。
次に、第2の実施形態の変形例3による基板処理方法について説明する。変形例3の基板処理方法は、複数の触媒反応部を有する装置において好適に実施することができる。図31を参照しながら、本変形例の基板処理方法に用いられる装置について説明する。
次に、第2の実施形態の変形例4による基板処理方法について説明する。変形例4の基板処理方法では、特にH2ガスとO2ガスを分離して間欠的に供給される。この基板処理方法は、図17を参照しながら説明した原理に基づくものである。この基板処理方法は、具体的には、図30に示す成膜装置において行われ、図37に示すタイミングでO2ガス、H2ガスが導入される。
ガスの間欠的な供給は、本変形例に限らず、本発明の他の実施形態による基板処理方法に適用可能である。
Claims (18)
- 基板を処理する基板処理方法であって、
容器内に基板を配置する工程;
触媒を収容する触媒反応部内へ、H2ガスを第1の流量で導入し、前記H2ガスと独立にO2ガスを第2の流量で導入する導入工程であって、前記触媒に接触した前記H2ガス及び前記O2ガスから生成したH2Oガスを前記触媒反応部から前記基板へ向けて噴出させる当該導入工程;及び
前記触媒反応部へ導入される前記O2ガスの流量を、前記第2の流量より少ない第3の流量に減少させるO2流量減少工程;
を含み、
前記導入工程、及び前記O2流量減少工程をこの順で所定の繰り返し周波数にて繰り返して前記基板を処理する基板処理方法。 - 前記導入工程の開始後、酸化物膜の構成元素を含む成膜ガスを前記容器内に所定の期間供給する成膜ガス供給工程を更に含み、
前記所定の繰り返し周波数での繰り返しが、前記導入工程、前記成膜ガス供給工程、及び前記O2流量減少工程の順で行われる、請求項1に記載の基板処理方法。 - 前記O2流量減少工程における前記第3の流量がゼロsccmである、請求項2に記載の基板処理方法。
- 前記触媒反応部へ導入される前記H2ガスの流量を、前記第1の流量より少ない第4の流量に減少させるH2流量減少工程を更に含む、請求項2に記載の基板処理方法。
- 前記O2流量減少工程における前記第3の流量がゼロsccmであり、
前記H2流量減少工程における前記第4の流量がゼロsccmである、請求項4に記載の基板処理方法。 - 前記O2流量減少工程の後に前記H2流量減少工程が行われる、請求項5に記載の基板処理方法。
- 前記成膜ガス供給工程が、前記導入工程の開始後、前記O2流量減少工程及び前記H2流量減少工程の後に行われ、
前記所定の繰り返し周波数での繰り返しが、前記導入工程、前記O2流量減少工程及び前記H2流量減少工程、並びに前記成膜ガス供給工程の順で行なわれる、請求項5に記載の基板処理方法。 - 前記導入工程が、前記触媒反応部におけるO2ガスの分圧を第1の分圧にする工程を含み、
前記O2流量減少工程が、前記触媒反応部におけるO2ガスの分圧を、前記第1の分圧より低い第2の分圧にする工程を含む、請求項2に記載の基板処理方法。 - 前記導入工程において、前記H2ガスが前記O2ガスより先に前記触媒反応部内に導入される、請求項2に記載の基板処理方法。
- 前記所定の繰り返し周波数が1Hzから1kHzまでの範囲にある、請求項2に記載の基板処理方法。
- 前記所定の期間が1秒未満である、請求項2に記載の基板処理方法。
- 前記O2流量減少工程における前記第3の流量がゼロsccmである、請求項1に記載の基板処理方法。
- 前記触媒反応部へ導入される前記H2ガスの流量を、前記第1の流量より少ない第4の流量に減少させるH2流量減少工程を更に含む、請求項1に記載の基板処理方法。
- 前記O2流量減少工程における前記第3の流量がゼロsccmであり、
前記H2流量減少工程における前記第4の流量がゼロsccmである、請求項13に記載の基板処理方法。 - 前記O2流量減少工程の後に前記H2流量減少工程が行われる、請求項14に記載の基板処理方法。
- 前記導入工程が、前記触媒反応部におけるO2ガスの分圧を第1の分圧にする工程を含み、
前記O2流量減少工程が、前記触媒反応部におけるO2ガスの分圧を、前記第1の分圧より低い第2の分圧にする工程を含む、請求項1に記載の基板処理方法。 - 前記導入工程において、前記H2ガスが前記O2ガスより先に前記触媒反応部内に導入される、請求項1に記載の基板処理方法。
- 前記所定の繰り返し周波数が1Hzから1kHzまでの範囲にある、請求項1に記載の基板処理方法。
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