JP2004282064A - 高周波電力を使ったプラズマ反応により半導体基板上に低比誘電率膜を形成するための方法 - Google Patents
高周波電力を使ったプラズマ反応により半導体基板上に低比誘電率膜を形成するための方法 Download PDFInfo
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Abstract
【解決手段】低比誘電率及び高い機械的硬度を有する膜をプラズマ反応によって半導体基板上に形成するための方法は、(i)ソースガスとしてシリコン含有炭化水素ガスを半導体基板が配置されるプラズマCVD処理用反応空間内に導入する工程と、(ii) 反応空間内のプラズマ重合反応を活性化するべく反応空間の圧力を100Paまたはそれ以上に維持しながら反応空間へ1000Wまたはそれ以上の高周波電力を印加する工程であって、それによって前記半導体基板上に薄膜が形成されるところの工程を含む。
【選択図】図1
Description
Rt[s]=9.42×107(Pr・Ts/Ps・Tr)rw 2d/F
ここで、
Pr:反応空間の圧力(Pa)
Ps:標準大気圧(Pa)
Tr:反応ガスの平均温度(K)
Ts:標準温度(K)
rw:シリコン基板の半径(m)
d:シリコン基板と上部電力との間隔(m)
F:反応ガスの総流量(sccm)
不活性ガス及び/またはソースガスを励起させるために遠隔プラズマチャンバを使用する際、遠隔プラズマチャンバ及び該遠隔プラズマチャンバと反応チャンバとを連結する管路の内部はガス流量を決定する際に考慮する必要がある。Rtの好適範囲は100msec≦Rtであり、より好適には200msec≦Rt≦5secを含む、少なくとも165msecである。
DM-DMOS(ジメチルジメトキシシラン):240sccm
He:100sccm
O2:0sccm
RF電力:3000W(13.4MHzの電力及び430kHz電力を重畳する)
Pr(反応チャンバ圧力):532Pa
Tr(反応ガスの平均温度):673K
rw(シリコン基板の半径):0.1m
d(シリコン基板と上部電力との間隔):0.024m
F(反応ガスの総流量):340sccm
Ps(標準大気圧):1.01×105Pa
Ts(標準温度):273K
Rt(滞留時間Rt):160msec
好適実施例において、一般式SiαOβCxHy(α、β、x及びyは整数)で表現されるシリコン含有炭化水素化合物は気化され、その後プラズマCVD装置の反応空間内に導入される。該反応空間は基板が載置されるところの反応チャンバの内部である。
SiαOα−1R2α−β+2(OCnH2n+1)β
ここで、αは1〜3の整数、βは0、1または2、nは1〜3の整数、及びRはSiに結合したC1-6炭化水素である。
以下に説明するように実験が行われた。実験では、ソースガスとしてDM-DMOS(ジメチルジメトキシシラン)が使用され、実験装置として従来のプラズマCVD装置(Eagle(登録商標)日本エー・エス・エム株式会社)が使用された。膜形成条件が表1、表3及び表5に示されている。結果は表2、表4及び表6に示されている。表中、“DM”はDM-DMOSであり、“P”は圧力であり、“HF”は高周波(27.12MHz)であり、“LF”は低周波(400kHz)であり、“Gap”は基板と上部電極(シャワーヘッド)との間の距離であり、“Sus”はサセプタの温度であり、“wall”はリアクタの内壁の温度であり、“SHD”はシャワーヘッドの温度であり、“EM”は弾性係数であり、“k値”は比誘電率である。
Rt[s]=9.42×107(Pr・Ts/Ps・Tr)rw 2d/F
ここで、Prは反応空間圧力(Pa)、Psは標準大気圧(Pa)、Trは反応ガスの平均温度(K)、Tsは標準温度(K)、rwはシリコン基板の半径(m)、dはシリコン基板と上部電極との間の距離(m)、Fは反応ガスの総流量(sccm)である、ところの方法。
2 ヒータ
3 サセプタ
4 半導体基板
5 ガス流入ポート
6 反応チャンバ
7 流量制御器
8 制御バルブ
9 高周波電源
10 ガス拡散板
11 排気口
12 反応ガス供給装置
13 配管
14 ガス流入ポート
15 ガス流入ポート
16 ガス流入ポート
17 気化器
18 シリコン含有炭化水素化合物
Claims (9)
- 低比誘電率及び高い機械的硬度を有する膜をプラズマ反応によって半導体基板上に形成するための方法であって、
ソースガスとしてシリコン含有炭化水素ガスを半導体基板が配置されるプラズマCVD処理用の反応空間内に導入する工程であって、前記シリコン含有炭化水素はプラズマ反応によってシロキサン重合体を形成するべく自己重合または架橋剤と重合することができるところの工程と、
反応空間内のプラズマ重合反応を活性化するべく反応空間の圧力を100Paまたはそれ以上に維持しながら反応空間へ1000Wまたはそれ以上の高周波電力を印加する工程であって、それによって前記半導体基板上に薄膜が形成されるところの工程と、
から成る方法。 - 請求項1に記載の方法であって、さらにプラズマ重合反応中に反応空間内に不活性ガスを導入する工程から成る方法。
- 請求項1に記載の方法であって、前記圧力は300〜1000Paである、ところの方法。
- 請求項1に記載の方法であって、前記高周波電力は2000〜15000Wである、ところの方法。
- 請求項1に記載の方法であって、前記高周波電力は3000〜10000Wである、ところの方法。
- 請求項1に記載の方法であって、前記半導体基板は直径300mmのウエハである、ところの方法。
- 請求項1に記載の方法であって、前記高周波電力は高周波電力及び低周波電力を重畳することによって印加される、ところの方法。
- 請求項1に記載の方法であって、プラズマ重合反応用に前記ソースガスに酸化ガスが添加される、ところの方法。
- 請求項1に記載の方法であって、プラズマ重合反応用に前記ソースガスに架橋ガスが添加される、ところの方法。
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100893675B1 (ko) | 2007-05-11 | 2009-04-17 | 주식회사 테스 | 비정질 탄소막 형성 방법 및 이를 이용한 반도체 소자의제조 방법 |
JP2010507259A (ja) * | 2006-10-16 | 2010-03-04 | アプライド マテリアルズ インコーポレイテッド | Sti用の二酸化シリコンの高品質誘電体膜の形成:harpii−遠隔プラズマ増強型堆積プロセス−のための異なるシロキサンベースの前駆物質の使用 |
KR101390349B1 (ko) * | 2007-11-22 | 2014-05-02 | (주)소슬 | 아모포스 카본막, 그 형성 방법 및 이를 이용한 반도체소자의 제조 방법 |
KR20140107932A (ko) * | 2013-02-28 | 2014-09-05 | 주성엔지니어링(주) | 플라즈마 처리 장치 |
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-
2003
- 2003-03-17 US US10/391,030 patent/US6740602B1/en not_active Expired - Lifetime
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KR100893675B1 (ko) | 2007-05-11 | 2009-04-17 | 주식회사 테스 | 비정질 탄소막 형성 방법 및 이를 이용한 반도체 소자의제조 방법 |
KR101390349B1 (ko) * | 2007-11-22 | 2014-05-02 | (주)소슬 | 아모포스 카본막, 그 형성 방법 및 이를 이용한 반도체소자의 제조 방법 |
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KR102067037B1 (ko) * | 2013-02-28 | 2020-01-15 | 주성엔지니어링(주) | 플라즈마 처리 장치 |
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