JPH06163429A - Method of forming al or al alloy film - Google Patents

Method of forming al or al alloy film

Info

Publication number
JPH06163429A
JPH06163429A JP4317424A JP31742492A JPH06163429A JP H06163429 A JPH06163429 A JP H06163429A JP 4317424 A JP4317424 A JP 4317424A JP 31742492 A JP31742492 A JP 31742492A JP H06163429 A JPH06163429 A JP H06163429A
Authority
JP
Japan
Prior art keywords
film
film forming
gas
bubbling
alh3
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP4317424A
Other languages
Japanese (ja)
Other versions
JP3251990B2 (en
Inventor
Hiroshi Yamamoto
浩 山本
Tadashi Nakano
正 中野
Hidekazu Kondo
英一 近藤
Tomohiro Oota
与洋 太田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP31742492A priority Critical patent/JP3251990B2/en
Publication of JPH06163429A publication Critical patent/JPH06163429A/en
Application granted granted Critical
Publication of JP3251990B2 publication Critical patent/JP3251990B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To enable an Al or an Al alloy film to be stably formed less leaving residual carbon or the like by a method wherein alane adduct gas represented by a chemical formula, AlH3.X, wherein X is liquid at a normal temperature, is supplied into a CVD reaction tank as Al material by bubbling. CONSTITUTION:Alane adduct gas AlH3.P(C2H5)3 is prepared as Al material, filled into a bubbler 4, and kept at a temperature of 60 deg.C. In this state, alane adduct gas AlH3.P(C2H5)3 is introduced into a film forming chamber 8 by bubbling H2. A substrate 18 composed of an Si wafer on which barrier metal TiN is deposited is placed inside the film forming chamber 18, and an Al film is made to grow on the barrier metal TiN. As mentioned above, alane adduct gas is liquid at a normal temperature, so that it can be stably supplied to a CVD reaction tank by bubbling. Furthermore, as alane adduct gas is thermally stable, a film can be stably formed.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、半導体デバイス中に使
用するAl膜若しくはAl合金膜をCVDによって形成
するための成膜方法に関し、特に高くかつ安定な速度で
膜形成が可能な成膜方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film forming method for forming an Al film or an Al alloy film used in a semiconductor device by CVD, and particularly to a film forming method capable of forming a film at a high and stable rate. It is about.

【0002】[0002]

【従来の技術】従来、CVDによるAl若しくはAl合
金の成膜には、TIBA(Triisobutylaluminum )、D
MAH(Dimetylaluminumhydride )等のアルキルアル
ミニウム化合物ガスや、TMAA(Trimetylamine Alan
e )、TEAA(TrietylamineAlane)、DMEAA(D
imetyletylamine Alane )等のアランアダクトガスが
原料として使用されていた。
2. Description of the Related Art Conventionally, for forming Al or Al alloy by CVD, TIBA (Triisobutylaluminum), D
Alkyl aluminum compound gas such as MAH (Dimetylaluminum hydride) and TMAA (Trimetylamine Alan)
e), TEAA (TrietylamineAlane), DMEAA (D
Alan adduct gas such as imetyletylamine Alane) was used as a raw material.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、アルキ
ルアルミニウム化合物ガスは、分子中にAlと炭素の結
合を含むため、成膜されたAl膜若しくはAl合金膜中
に炭素が残留しやすいと言う問題があった。一方、アラ
ンアダクトガスの内、従来最も使用例が多いTMAA
は、常温で固体であるため、バブリングによって安定に
供給することができないと言う問題があった。また、T
EAAとDMEAAは、常温で液体であるのでバブリン
グによって安定に供給することができるものの、熱的に
不安定であるため安定に成膜を行うことが困難であると
言う問題があった。
However, since the alkylaluminum compound gas contains a bond of Al and carbon in the molecule, there is a problem that carbon tends to remain in the formed Al film or Al alloy film. there were. On the other hand, of the allan adduct gas, TMAA, which has been the most used example in the past
However, since it is a solid at room temperature, there is a problem that it cannot be stably supplied by bubbling. Also, T
Since EAA and DMEAA are liquids at room temperature, they can be stably supplied by bubbling, but there is a problem that stable film formation is difficult because they are thermally unstable.

【0004】そこで、本発明は、炭素等の残留が少な
く、Al膜若しくはAl合金膜の安定な形成を可能にす
る成膜方法を提供することを目的とする。
Therefore, an object of the present invention is to provide a film forming method in which carbon or the like remains little and stable formation of an Al film or an Al alloy film is possible.

【0005】[0005]

【課題を解決するための手段】上記課題を解決するた
め、本発明に係るAl若しくはAl合金の成膜方法は、
化学式AlH3 ・Xで表され、Xが常温で液体であるア
ランアダクトガスを、Alの原料としてバブリングによ
りCVD反応槽内に供給することを特徴とする。ここ
で、化学式中のXは、N(C3 7 3 、(CH3 2
NCH2 CH2 N(CH3 2 、P(CH3 3 、P
(C2 5 3 、(CH3 2 PCH2 CH2 P(CH
3 2 、(C5 5 N)2 、N(CF3 3 、及びP
(CF3 3 等から選択されたものとすることができ
る。
In order to solve the above problems, an Al or Al alloy film forming method according to the present invention comprises:
Alan adduct gas represented by the chemical formula AlH 3 .X, where X is a liquid at room temperature, is supplied into the CVD reaction tank by bubbling as a raw material of Al. Here, X in the chemical formula is N (C 3 H 7 ) 3 , (CH 3 ) 2
NCH 2 CH 2 N (CH 3 ) 2 , P (CH 3 ) 3 , P
(C 2 H 5 ) 3 , (CH 3 ) 2 PCH 2 CH 2 P (CH
3 ) 2 , (C 5 H 5 N) 2 , N (CF 3 ) 3 , and P
It may be selected from (CF 3 ) 3 and the like.

【0006】[0006]

【作用】本発明のAl若しくはAl合金の成膜方法によ
れば、化学式AlH3 ・Xで表され、Xが常温で液体で
あるアランアダクトガスをAlの原料として用いる。こ
のようなアランアダクトガスは、常温で液体であり、か
つ、熱的に安定である。したがって、アランアダクトガ
スをバブリングによって安定にCVD反応槽内に供給す
ることができ、さらに、安定した成膜を達成することが
できる。
According to the Al or Al alloy film forming method of the present invention, the allan adduct gas represented by the chemical formula AlH 3 .X, where X is a liquid at room temperature, is used as the Al raw material. Such an allan adduct gas is liquid at room temperature and is thermally stable. Therefore, the allan adduct gas can be stably supplied into the CVD reaction tank by bubbling, and further stable film formation can be achieved.

【0007】[0007]

【実施例】以下、本発明の具体的実施例について説明す
る。
EXAMPLES Specific examples of the present invention will be described below.

【0008】図1は、実施例の成膜方法を実施するため
のCVD装置を示した図である。簡単に説明すると、マ
スフローコントローラ2で流量を制御されたキャリアガ
スH 2 は、液体状の原料ガスを収容したバブラ4中に導
入される。バブラー4中の原料ガスは、バブラー4を包
む恒温槽6によって一定温度に保たれる。バブラー4か
らの原料ガスは、加熱用ヒータに包まれた配管を通って
反応槽である成膜室8に導入される。成膜室8に導入す
べき原料ガスの圧力を調整するため、配管の途中には、
圧力計10と圧力調整弁12とが設けられている。この
圧力調整弁12は、圧力計10が一定の圧力を示すよう
に制御されている。成膜室8に導入された原料ガスは、
ガスノズル14をへて、サセプタ16上に保持された基
板18表面に供給される。基板18は、成膜室8に接続
されたロードロック20から成膜室8内に導入される。
成膜室8の圧力を調整するため、圧力計22と真空ポン
プ24も成膜室8に接続されている。成膜室8と真空ポ
ンプ24との間には、圧力調整弁26が設けられてい
て、成膜室8内の圧力を調節する。
FIG. 1 is for carrying out the film forming method of the embodiment.
FIG. 3 is a view showing the CVD apparatus of FIG. Briefly,
Carrier gas whose flow rate is controlled by the sflow controller 2
Su H 2Is introduced into the bubbler 4 containing the liquid source gas.
Be entered. The source gas in the bubbler 4 contains the bubbler 4.
The temperature is kept constant by the constant temperature bath 6. Bubbler 4
These raw material gases pass through the pipe wrapped in the heater for heating.
It is introduced into the film forming chamber 8 which is a reaction tank. Introduced into the film forming chamber 8
In order to adjust the pressure of the raw material gas,
A pressure gauge 10 and a pressure adjusting valve 12 are provided. this
The pressure regulating valve 12 is provided so that the pressure gauge 10 shows a constant pressure.
Controlled by. The source gas introduced into the film forming chamber 8 is
The base held on the susceptor 16 through the gas nozzle 14
It is supplied to the surface of the plate 18. The substrate 18 is connected to the film forming chamber 8.
The film is introduced into the film forming chamber 8 from the loaded load lock 20.
In order to adjust the pressure in the film forming chamber 8, a pressure gauge 22 and a vacuum pump are used.
The film 24 is also connected to the film forming chamber 8. Deposition chamber 8 and vacuum port
A pressure adjusting valve 26 is provided between the pump 24 and the pump 24.
Then, the pressure in the film forming chamber 8 is adjusted.

【0009】以下、具体的な製造方法について説明す
る。まず、Alの原料であるアランアダクトガスAlH
3 ・P(C2 5 3 を準備し、これをバブラー4中に
充填して60℃の温度に保つ。この状態で、H2 のバブ
リングを行ってアランアダクトガスAlH3 ・P(C2
5 3 を成膜室8に導く。成膜室8内には、Siウェ
ハ上にバリアメタルTiNを蒸着した基板18が準備さ
れており、このバリアメタルTiN上にAl膜が成長す
る。この結果、初期的な成膜速度として約300nm/
mmの値が得られた。さらに、1日平均5枚の割合で成
膜実験を続けて60枚までの成膜速度を調べたが、成長
速度にばらつきの範囲を越える変化は見られなかった。
A specific manufacturing method will be described below. First, allan adduct gas AlH which is a raw material of Al
3. Prepare P (C 2 H 5 ) 3 and fill it in the bubbler 4 to keep the temperature at 60 ° C. In this state, bubbling of H 2 is performed to perform the allan adduct gas AlH 3 · P (C 2
H 5 ) 3 is introduced into the film forming chamber 8. A substrate 18 in which a barrier metal TiN is vapor-deposited on a Si wafer is prepared in the film forming chamber 8, and an Al film is grown on this barrier metal TiN. As a result, the initial film formation rate is about 300 nm /
A value of mm was obtained. Further, the film formation experiment was continued at an average rate of 5 films per day, and the film formation rates of up to 60 films were examined, but no change in growth rate beyond the range of variation was observed.

【0010】次に、従来方法に対応する比較例の成膜実
験について説明する。Al膜の原料として従来方法で用
いるDMEAAを準備して上記実施例と同様の成膜実験
を行った。比較例の成膜実験でも、バブラー4の温度調
節によって実施例とほぼ同一の初期的な成膜速度が得ら
れた。さらに、1日平均5枚の割合で成膜実験を続けて
60枚までの成膜速度を調べたところ、成長速度に変化
が見られた。これは、原料ガスであるDMEAAが熱的
安定性に乏しいため、バブラー4内でDMEAAの一部
が分解したためであると考えられる。
Next, a film forming experiment of a comparative example corresponding to the conventional method will be described. DMEAA used in the conventional method was prepared as a raw material of the Al film, and the same film forming experiment as that of the above-mentioned example was conducted. Also in the film forming experiment of the comparative example, almost the same initial film forming rate as that of the example was obtained by adjusting the temperature of the bubbler 4. Further, when the film forming experiment was continued at an average rate of 5 sheets per day and the film forming rate up to 60 sheets was examined, a change was observed in the growth rate. It is considered that this is because part of DMEAA was decomposed in the bubbler 4 because the source gas DMEAA was poor in thermal stability.

【0011】図2は、実施例と比較例の製造方法を表に
したものである。表からも明らかなように、実施例と比
較例の製造方法は、バプラー温度のみが異なる。
FIG. 2 is a table showing the manufacturing methods of Examples and Comparative Examples. As is clear from the table, the manufacturing methods of Examples and Comparative Examples differ only in the bubbler temperature.

【0012】図3は、実施例と比較例の成膜速度をグラ
フ化したものである。実施例の成膜速度は白丸で示さ
れ、比較例の成膜速度は黒丸で示されている。グラフか
らも明らかなように、実施例の成膜速度はほとんど変化
しないが、比較例の成膜速度は成膜回数とともに徐々に
減少する。
FIG. 3 is a graph showing the film forming rates of the example and the comparative example. The film forming rates of the examples are indicated by white circles, and the film forming rates of the comparative examples are indicated by black circles. As is clear from the graph, the film formation rate of the example hardly changes, but the film formation rate of the comparative example gradually decreases with the number of film formations.

【0013】本発明は、上記実施例に限定されるもので
はない。例えば、Al原料のアランアダクトガスとし
て、AlH3 ・P(C2 5 3 の他に、AlH3 ・N
(C37 3 、AlH3 ・(CH3 2 NCH2 CH
2 N(CH3 2 、AlH3 ・P(CH3 3 、AlH
3 ・P(C2 5 3 、AlH3 ・(CH3 2 PCH
2 CH2 P(CH3 2 、AlH3 ・(C5
5 N)2 、AlH3 ・N(CF33 、AlH3 ・P
(CF3 3 等を使用することができる。
The present invention is not limited to the above embodiment. For example, as an allan adduct gas of Al raw material, in addition to AlH 3 · P (C 2 H 5 ) 3 , AlH 3 · N
(C 3 H 7) 3, AlH 3 · (CH 3) 2 NCH 2 CH
2 N (CH 3 ) 2 , AlH 3 · P (CH 3 ) 3 , AlH
3・ P (C 2 H 5 ) 3 , AlH 3・ (CH 3 ) 2 PCH
2 CH 2 P (CH 3 ) 2 , AlH 3 · (C 5 H
5 N) 2 , AlH 3 · N (CF 3 ) 3 , AlH 3 · P
(CF 3 ) 3 or the like can be used.

【0014】[0014]

【発明の効果】以上説明したように、本発明に係るAl
若しくはAl合金の成膜方法によれば、化学式AlH3
・Xで表され、Xが常温で液体であるアランアダクトガ
スをAlの原料として用いる。このようなアランアダク
トガスは常温で液体であるから、バブリングによって安
定にCVD反応槽内に供給することができる。さらに、
このようなアランアダクトガスは熱的に安定であるか
ら、安定した成膜が可能になる。
As described above, the Al according to the present invention
Alternatively, according to the film forming method of the Al alloy, the chemical formula AlH 3
An allan adduct gas represented by X, where X is a liquid at room temperature, is used as a raw material for Al. Since this allan adduct gas is liquid at room temperature, it can be stably supplied into the CVD reaction tank by bubbling. further,
Since such an allan adduct gas is thermally stable, stable film formation is possible.

【図面の簡単な説明】[Brief description of drawings]

【図1】実施例の方法を実施するためのCVD装置を示
した図。
FIG. 1 is a diagram showing a CVD apparatus for carrying out the method of the embodiment.

【図2】実施例と比較例の成膜条件をまとめた図表。FIG. 2 is a chart summarizing film forming conditions of Examples and Comparative Examples.

【図3】実施例と比較例の成膜速度を比較したグラフ。FIG. 3 is a graph comparing film forming rates of an example and a comparative example.

【符号の説明】[Explanation of symbols]

4…バブラー、8…CVD反応槽、18…基板。 4 ... Bubbler, 8 ... CVD reaction tank, 18 ... Substrate.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 近藤 英一 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社技術研究本部内 (72)発明者 太田 与洋 千葉県千葉市中央区川崎町1番地 川崎製 鉄株式会社技術研究本部内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Eiichi Kondo 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Technical Research Division (72) Inventor Yoyo Ota Kawasaki-cho, Chuo-ku, Chiba-shi No. 1 Kawasaki Steel Co., Ltd. Technical Research Division

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 化学式AlH3 ・Xで表され、Xが常温
で液体であるアランアダクトガスを、Alの原料として
バブリングによりCVD反応槽内に供給することを特徴
とするAl若しくはAl合金の成膜方法。
1. An Al or Al alloy composition characterized in that an allan adduct gas represented by the chemical formula AlH 3 .X, where X is a liquid at room temperature, is supplied as a raw material of Al into a CVD reaction tank by bubbling. Membrane method.
【請求項2】 前記化学式中のXは、N(C
3 7 3 、(CH3 2 NCH2 CH2 N(CH3
2 、P(CH3 3 、P(C2 5 3 、(CH3 2
PCH2 CH2 P(CH3 2 、(C5 5 N)2 、N
(CF3 3 、及びP(CF3 3 のいずれか1つから
選択されたものであることを特徴とする請求項1記載の
Al若しくはAl合金の成膜方法。
2. X in the chemical formula is N (C
3 H 7 ) 3 , (CH 3 ) 2 NCH 2 CH 2 N (CH 3 )
2 , P (CH 3 ) 3 , P (C 2 H 5 ) 3 , (CH 3 ) 2
PCH 2 CH 2 P (CH 3 ) 2 , (C 5 H 5 N) 2 , N
The film forming method of Al or Al alloy according to claim 1, wherein the film is selected from any one of (CF 3 ) 3 and P (CF 3 ) 3 .
JP31742492A 1992-11-26 1992-11-26 Al or Al alloy film forming method Expired - Fee Related JP3251990B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31742492A JP3251990B2 (en) 1992-11-26 1992-11-26 Al or Al alloy film forming method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31742492A JP3251990B2 (en) 1992-11-26 1992-11-26 Al or Al alloy film forming method

Publications (2)

Publication Number Publication Date
JPH06163429A true JPH06163429A (en) 1994-06-10
JP3251990B2 JP3251990B2 (en) 2002-01-28

Family

ID=18088078

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31742492A Expired - Fee Related JP3251990B2 (en) 1992-11-26 1992-11-26 Al or Al alloy film forming method

Country Status (1)

Country Link
JP (1) JP3251990B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5885321A (en) * 1996-07-22 1999-03-23 The United States Of America As Represented By The Secretary Of The Navy Preparation of fine aluminum powders by solution methods

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5885321A (en) * 1996-07-22 1999-03-23 The United States Of America As Represented By The Secretary Of The Navy Preparation of fine aluminum powders by solution methods

Also Published As

Publication number Publication date
JP3251990B2 (en) 2002-01-28

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