JPWO2019044440A1 - 気相成長装置、及び、気相成長方法 - Google Patents
気相成長装置、及び、気相成長方法 Download PDFInfo
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- JPWO2019044440A1 JPWO2019044440A1 JP2019539147A JP2019539147A JPWO2019044440A1 JP WO2019044440 A1 JPWO2019044440 A1 JP WO2019044440A1 JP 2019539147 A JP2019539147 A JP 2019539147A JP 2019539147 A JP2019539147 A JP 2019539147A JP WO2019044440 A1 JPWO2019044440 A1 JP WO2019044440A1
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 77
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 76
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- 239000012535 impurity Substances 0.000 claims description 69
- 229910052757 nitrogen Inorganic materials 0.000 claims description 68
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Abstract
Description
第1の実施形態の気相成長装置は、反応室と、反応室の中に設けられ、基板が載置可能であり、基板の外周を所定の間隙を有して保持可能な保持壁を有する基板保持部と、反応室の上に設けられ、第1のプロセスガスを反応室に供給可能な第1の領域と、第1の領域の周囲に設けられ第1のプロセスガスよりも炭素/シリコン原子比の高い第2のプロセスガスを反応室に供給可能な第2の領域とを有し、第2の領域の内周直径が保持壁の直径の75%以上130%以下であるプロセスガス供給部と、反応室の中の、プロセスガス供給部と基板保持部との間の領域に設けられ、内周直径が第2の領域の外周直径の110%以上200%以下である側壁と、基板保持部の下に設けられた第1のヒータと、側壁と反応室の内壁との間に設けられた第2のヒータと、基板保持部を回転させる回転駆動機構と、を備える。
第2の実施形態の気相成長装置は、プロセスガス供給部が第3の領域を、更に有し、側壁にガス通過孔が設けられる点以外は、第1の実施形態と同様である。したがって、第1の実施形態と重複する内容については一部記述を省略する。
第3の実施形態の気相成長方法は、基板を300rpm以上の回転速度で回転させ、基板を加熱し、基板に向けて、炭素、シリコン、及び、前記n型不純物を含む第1のプロセスガスを供給し、基板に向けて、第1のプロセスガスが供給される領域よりも外側の領域に、炭素、及び、前記n型不純物を含み、第1のプロセスガスよりも炭素/シリコン原子比の高い第2のプロセスガスを供給し、基板の表面の直上のプロセスガスの実効的な炭素/シリコン原子比が1未満となる状態で、基板の表面に第1の炭化珪素膜を形成し、基板に向けて、炭素、シリコン、及び、前記n型不純物を含む第3のプロセスガスを供給し、基板に向けて、第3のプロセスガスが供給される領域よりも外側の領域に、炭素、及び、前記n型不純物を含み、第3のプロセスガスよりも炭素/シリコン原子比の高い第4のプロセスガスを供給し、基板の表面の直上のプロセスガスの実効的な炭素/シリコン原子比が1以上となる状態で、基板の表面に第1の炭化珪素膜よりも前記n型不純物濃度の低い第2の炭化珪素膜を形成する。
10a 内壁
12 プロセスガス供給部
12a 第1の領域
12b 第2の領域
14 サセプタ(基板保持部)
14a 保持壁
20 回転駆動機構
22 第1のヒータ
40 フード(側壁)
42 第2のヒータ
100 気相成長装置
G1 第1のプロセスガス
G2 第2のプロセスガス
W ウェハ(基板)
d1 第2の領域の内周直径
d2 第2の領域の外周直径
d3 保持壁の直径
d5 フード(側壁)の内周直径
Claims (15)
- 反応室と、
前記反応室の中に設けられ、基板が載置可能であり、前記基板の外周を所定の間隙を有して保持可能な保持壁を有する基板保持部と、
前記反応室の上に設けられ、第1のプロセスガスを前記反応室に供給可能な第1の領域と、前記第1の領域の周囲に設けられ前記第1のプロセスガスよりも炭素/シリコン原子比の高い第2のプロセスガスを前記反応室に供給可能な第2の領域とを有し、前記第2の領域の内周直径が前記保持壁の直径の75%以上130%以下であるプロセスガス供給部と、
前記反応室の中の、前記プロセスガス供給部と前記基板保持部との間の領域に設けられ、内周直径が前記第2の領域の外周直径の110%以上200%以下である側壁と、
前記基板保持部の下に設けられた第1のヒータと、
前記側壁と前記反応室の内壁との間に設けられた第2のヒータと、
前記基板保持部を回転させる回転駆動機構と、
を備える気相成長装置。 - 前記第2の領域の内周直径が前記保持壁の直径の100%以上である請求項1記載の気相成長装置。
- 前記側壁の内周直径が前記基板保持部の直径の105%以上200%以下である請求項1記載の気相成長装置。
- 前記回転駆動機構は、前記基板を300rpm以上3000rpm以下の回転速度で回転させる請求項1記載の気相成長装置。
- 前記プロセスガス供給部は、前記第2の領域の周囲に設けられ、前記側壁と前記第2のヒータとの間の領域に第3のプロセスガスを供給可能な第3の領域を有し、
前記側壁は、前記第3のプロセスガスを前記側壁の外側から前記側壁の内側へ通過させるガス通過孔を有する請求項1記載の気相成長装置。 - 前記第3のプロセスガスはアルゴンガスである請求項5記載の気相成長装置。
- 基板を300rpm以上の回転速度で回転させ、
前記基板を加熱し、
前記基板に向けて第1の流速で第1のプロセスガスを供給し、
前記基板に向けて、前記第1のプロセスガスが供給される領域よりも外側の領域に、第2の流速で前記第1のプロセスガスよりも炭素/シリコン原子比の高い第2のプロセスガスを供給し、
前記第1の流速、前記第2の流速、及び、前記回転速度を制御して、前記第2のプロセスガスが前記基板の中心方向に引き込まれる流れを形成し、前記基板の表面に炭化珪素膜を形成する気相成長方法。 - 前記第1の流速、及び、前記第2の流速は、0.2m/sec以上1.0m/sec以下である請求項7記載の気相成長方法。
- 前記第2の流速が前記第1の流速の50%以上200%以下である請求項7記載の気相成長方法。
- 前記基板を1500℃以上に加熱する請求項7記載の気相成長方法。
- 前記第1のプロセスガス及び前記第2のプロセスガスは窒素を含む請求項7記載の気相成長方法。
- 基板を300rpm以上の回転速度で回転させ、
前記基板を加熱し、
前記基板に向けて、炭素、シリコン、及び、n型不純物を含む第1のプロセスガスを供給し、
前記基板に向けて、前記第1のプロセスガスが供給される領域よりも外側の領域に、炭素、及び、n型不純物を含み、前記第1のプロセスガスよりも炭素/シリコン原子比の高い第2のプロセスガスを供給し、
前記基板の表面の直上のプロセスガスの実効的な炭素/シリコン原子比が1未満となる状態で、前記基板の表面に第1の炭化珪素膜を形成し、
前記基板に向けて、炭素、シリコン、及び、n型不純物を含む第3のプロセスガスを供給し、
前記基板に向けて、前記第3のプロセスガスが供給される領域よりも外側の領域に、炭素、及び、n型不純物を含み、前記第3のプロセスガスよりも炭素/シリコン原子比の高い第4のプロセスガスを供給し、
前記基板の表面の直上のプロセスガスの実効的な炭素/シリコン原子比が1以上となる状態で、前記基板の表面に前記第1の炭化珪素膜よりもn型不純物の低い第2の炭化珪素膜を形成する気相成長方法。 - 前記第1の炭化珪素膜を形成する際に前記基板の中心部及び前記基板の外周部の前記基板の表面の直上のプロセスガスの実効的な炭素/シリコン原子比が1未満となり、
前記第2の炭化珪素膜を形成する際に前記基板の中心部及び前記基板の外周部の前記基板の表面の直上のプロセスガスの実効的な炭素/シリコン原子比が1以上となる請求項12記載の気相成長方法。 - 前記第1の炭化珪素膜のn型不純物濃度が1×1017cm−3以上であり、前記第2の炭化珪素膜のn型不純物濃度が1×1016cm−3以下である請求項12記載の気相成長方法。
- 前記n型不純物は窒素である請求項12記載の気相成長方法。
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