JP6040609B2 - 成膜装置及び成膜方法 - Google Patents
成膜装置及び成膜方法 Download PDFInfo
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- JP6040609B2 JP6040609B2 JP2012161817A JP2012161817A JP6040609B2 JP 6040609 B2 JP6040609 B2 JP 6040609B2 JP 2012161817 A JP2012161817 A JP 2012161817A JP 2012161817 A JP2012161817 A JP 2012161817A JP 6040609 B2 JP6040609 B2 JP 6040609B2
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Description
真空容器内にて基板に対して成膜処理を行うための成膜装置において、
基板を載置する基板載置領域を公転させるための回転テーブルと、
前記基板載置領域が通過する領域に第1の処理ガスを供給して基板に第1の処理ガスの成分を吸着させるための第1の処理ガス供給部と、
前記第1の処理ガス供給部に対して回転テーブルの回転方向に離間して設けられ、基板に吸着された前記第1の処理ガスの成分と反応して反応層を形成するための第2の処理ガスを供給する第2の処理ガス供給部と、
前記第1の処理ガス供給部及び前記第2の処理ガス供給部から夫々ガスが供給される処理領域同士を互いに分離するために、これら処理領域同士の間に設けられた分離領域に対して分離ガスを供給するための分離ガス供給部と、
薄膜を形成する成膜温度に基板を加熱するための加熱部と、
前記回転テーブルの回転方向で見て、前記第2の処理ガス供給部の下流側でありかつ第1の処理ガス供給部の上流側に設けられ、プラズマ発生用ガスをプラズマ化して生成したプラズマにより基板上の反応層を改質するためのプラズマ処理部と、
前記回転テーブル上の基板の通過領域と対向するように当該回転テーブルの上方側に設けられ、基板の吸収波長領域の光を当該基板に照射して、前記成膜温度よりも高い温度に基板を加熱して薄膜を改質するための加熱ランプと、
前記回転テーブルの回転により反応層を形成するステップと反応層に対してプラズマにより改質するステップとを繰り返した後、処理ガスの供給を停止し、前記加熱ランプにより基板を加熱するように制御信号を出力する制御部と、を備え、
前記加熱ランプは、前記分離領域の上方側に設けられていることを特徴とする。
真空容器内に設けられた回転テーブル上の基板載置領域に、表面に凹部が形成された基板を載置すると共に、この基板載置領域を公転させる工程と、
薄膜を形成する温度に前記回転テーブル上の基板を加熱する工程と、
次いで、前記回転テーブル上の基板に対して第1の処理ガス供給部から第1の処理ガスを供給して、当該基板上に第1の処理ガスの成分を吸着させるステップと、前記第1の処理ガス供給部に対して回転テーブルの回転方向に離間して設けられた第2の処理ガス供給部から、基板に吸着された前記第1の処理ガスの成分と反応して反応層を形成するための第2の処理ガスを供給するステップと、前記回転テーブルの回転方向で見て、前記第2の処理ガス供給部の下流側でありかつ第1の処理ガス供給部の上流側に設けられたプラズマ処理部にて、プラズマ発生用ガスをプラズマ化して生成したプラズマにより基板上の反応層の改質を行うステップと、を繰り返して薄膜を成膜する工程と、
しかる後、処理ガスの供給を停止した状態で、前記回転テーブル上の基板の通過領域と対向するように設けられた加熱ランプにより基板の吸収波長領域の光を当該基板に照射して、前記成膜温度よりも高い温度に基板を加熱して、前記薄膜を改質する工程と、を含み、
前記改質する工程は、前記分離領域の上方側に設けられた前記加熱ランプにより行われる工程であることを特徴とする。
前記薄膜を改質する工程は、処理ガスが熱分解する温度以上に基板を加熱する工程である構成。
加熱ランプ120については、分離ガスノズル41の上方側などに設けても良い。
また、表1の第1の処理ガスを酸化するための第2の処理ガスとしては、表2の化合物を用いても良い。
(表2)
尚、この表2における「プラズマ+O2」や「プラズマ+O3」とは、例えば第2の処理ガスノズル32の上方側にプラズマ処理部80を設けて、あるいは既述の平行電極を用いて、これら酸素ガスやオゾンガスをプラズマ化して用いることを意味している。第2の処理ガスとして酸素ガスのプラズマを用いた場合には、当該第2の処理ガスの熱分解温度は、既述のオゾンガスの熱分解温度よりも高くなり、アニール温度以上となる。
(表3)
尚、この表3における「プラズマ」についても、表2と同様に「プラズマ」の用語に続く各ガスをプラズマ化して用いることを意味している。
シリコン膜のプラズマ処理に用いるプラズマ発生用ガスとしては、ウエハWに対してイオンのエネルギーを与えるプラズマを発生させるガスが用いられ、具体的には既述のアルゴンガスの他に、ヘリウム(He)ガスなどの希ガスあるいは水素ガスなどが用いられる。
(表6)
(表7)
尚、この表7において、酸素元素(O)を含むプラズマ、窒素元素(N)を含むプラズマ及び炭素元素(C)を含むプラズマについては、酸化膜、窒化膜及び炭化膜を成膜するプロセスだけに夫々用いても良い。
以上述べた各種の薄膜を成膜する時においても、薄膜の形成後にアニール処理を行っても良いし、薄膜の成膜途中あるいは反応層301を形成する度にアニール処理を行っても良い。また、アニール処理を行う時、各ガスの供給及び高周波電源85への給電を停止したが、分離ガス及びプラズマ発生用ガスの供給、更には高周波電源85への給電(プラズマ発生用ガスのプラズマ化)については、アニール処理に特に悪影響を及ぼさないことから、当該アニール処理を行っている時に前記供給や給電を行っても良い。
(実験例1)
始めに、成膜温度が600℃におけるALD法にてシリコン酸化膜からなる薄膜を成膜した時(プラズマ改質処理及びアニール処理なし)と、この薄膜に対してプラズマ改質処理やアニール処理を行った時とについて、薄膜の膜質を評価した実験について説明する。図17は、以下の表8の各条件にて成膜や後処理を各々行った薄膜について、フッ酸に対するウエットエッチングレートを測定した結果を示しており、参考例である熱酸化膜におけるウエットエッチングレートを1として規格化している。尚、この実験は、凹部の形成されていないシリコンウエハに対して薄膜を成膜しており、成膜処理及びプラズマ改質処理については、既述の真空容器1内にて各々行い、アニール処理は薄膜の成膜後、真空容器1から取り出して別の熱処理装置にて行っている。
(表8)
そこで、凹部の形成されたウエハについて、実験例1と同様に薄膜を形成し、次いで後処理としてプラズマ改質処理やアニール処理を行った時に、この後処理によって凹部の深さ方向における膜質(フッ酸に対するウエットエッチングレート)がどのような傾向になるのか実験を行った。このウエットエッチングレートは、フッ酸に各々のウエハを浸漬した後、ウエハを板厚方向に切断して、互いに隣接する凹部間におけるウエハの表面(水平面)、凹部内の側面、凹部の底面付近における側面について夫々測定した。この実験では凹部の深さ寸法は、1.7μmであり、「凹部内」及び「凹部の底面付近」とは、夫々ウエハの表面から150nm及び1.7μmの部位である。この凹部の開口径は、0.1μmである。実験例2における結果について、表9及び図18に示す。尚、実験例2においても、ウエットエッチングレートは熱酸化膜について得られた結果を1として規格化している。また、実験例2についても、アニール処理は真空容器1とは別の熱処理装置にて行っている。
(表9)
1 真空容器
2 回転テーブル
P1、P2 処理領域
P3 改質領域
P4 加熱領域
10 凹部
80 プラズマ処理部
120 加熱ランプ
Claims (6)
- 真空容器内にて基板に対して成膜処理を行うための成膜装置において、
基板を載置する基板載置領域を公転させるための回転テーブルと、
前記基板載置領域が通過する領域に第1の処理ガスを供給して基板に第1の処理ガスの成分を吸着させるための第1の処理ガス供給部と、
前記第1の処理ガス供給部に対して回転テーブルの回転方向に離間して設けられ、基板に吸着された前記第1の処理ガスの成分と反応して反応層を形成するための第2の処理ガスを供給する第2の処理ガス供給部と、
前記第1の処理ガス供給部及び前記第2の処理ガス供給部から夫々ガスが供給される処理領域同士を互いに分離するために、これら処理領域同士の間に設けられた分離領域に対して分離ガスを供給するための分離ガス供給部と、
薄膜を形成する成膜温度に基板を加熱するための加熱部と、
前記回転テーブルの回転方向で見て、前記第2の処理ガス供給部の下流側でありかつ第1の処理ガス供給部の上流側に設けられ、プラズマ発生用ガスをプラズマ化して生成したプラズマにより基板上の反応層を改質するためのプラズマ処理部と、
前記回転テーブル上の基板の通過領域と対向するように当該回転テーブルの上方側に設けられ、基板の吸収波長領域の光を当該基板に照射して、前記成膜温度よりも高い温度に基板を加熱して薄膜を改質するための加熱ランプと、
前記回転テーブルの回転により反応層を形成するステップと反応層に対してプラズマにより改質するステップとを繰り返した後、処理ガスの供給を停止し、前記加熱ランプにより基板を加熱するように制御信号を出力する制御部と、を備え、
前記加熱ランプは、前記分離領域の上方側に設けられていることを特徴とする成膜装置。 - 前記加熱部は、前記回転テーブルの下方側に設けられていることを特徴とする請求項1に記載の成膜装置。
- 前記加熱ランプにより薄膜を改質する時における基板の温度は、処理ガスが熱分解する温度以上の温度であることを特徴とする請求項1または2に記載の成膜装置。
- 基板に薄膜を成膜するための成膜方法において、
真空容器内に設けられた回転テーブル上の基板載置領域に、表面に凹部が形成された基板を載置すると共に、この基板載置領域を公転させる工程と、
薄膜を形成する温度に前記回転テーブル上の基板を加熱する工程と、
次いで、前記回転テーブル上の基板に対して第1の処理ガス供給部から第1の処理ガスを供給して、当該基板上に第1の処理ガスの成分を吸着させるステップと、前記第1の処理ガス供給部に対して回転テーブルの回転方向に離間して設けられた第2の処理ガス供給部から、基板に吸着された前記第1の処理ガスの成分と反応して反応層を形成するための第2の処理ガスを供給するステップと、前記回転テーブルの回転方向で見て、前記第2の処理ガス供給部の下流側でありかつ第1の処理ガス供給部の上流側に設けられたプラズマ処理部にて、プラズマ発生用ガスをプラズマ化して生成したプラズマにより基板上の反応層の改質を行うステップと、を繰り返して薄膜を成膜する工程と、
しかる後、処理ガスの供給を停止した状態で、前記回転テーブル上の基板の通過領域と対向するように設けられた加熱ランプにより基板の吸収波長領域の光を当該基板に照射して、前記成膜温度よりも高い温度に基板を加熱して、前記薄膜を改質する工程と、を含み、
前記改質する工程は、前記分離領域の上方側に設けられた前記加熱ランプにより行われる工程であることを特徴とする成膜方法。 - 前記基板を加熱する工程は、前記回転テーブルの下方側から当該回転テーブルを介して加熱する工程であることを特徴とする請求項4に記載の成膜方法。
- 前記改質する工程は、処理ガスが熱分解する温度以上に基板を加熱する工程であることを特徴とする請求項4または5に記載の成膜方法。
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