JPH05283403A - Manufacture of semiconductor device - Google Patents

Manufacture of semiconductor device

Info

Publication number
JPH05283403A
JPH05283403A JP26723192A JP26723192A JPH05283403A JP H05283403 A JPH05283403 A JP H05283403A JP 26723192 A JP26723192 A JP 26723192A JP 26723192 A JP26723192 A JP 26723192A JP H05283403 A JPH05283403 A JP H05283403A
Authority
JP
Japan
Prior art keywords
source
gas
film
nitrogen source
nitrogen
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
JP26723192A
Other languages
Japanese (ja)
Other versions
JP2945217B2 (en
Inventor
Tsukasa Doi
司 土居
Yukiko Mori
由紀子 森
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to US08/098,927 priority Critical patent/US5459108A/en
Priority to KR1019930015075A priority patent/KR970005678B1/en
Publication of JPH05283403A publication Critical patent/JPH05283403A/en
Application granted granted Critical
Publication of JP2945217B2 publication Critical patent/JP2945217B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Formation Of Insulating Films (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Chemical Vapour Deposition (AREA)

Abstract

PURPOSE:To form a film at a low temperature and obtain excellent buried flatness, by adding source which contains nitrogen in composition to organic source. CONSTITUTION:A nitrogen source system 21c has a mass flow controller 11, and a source vessel 7 which stores nitrogen source 17, and supplies the nitrogen source 17, which is subjected to bubbling by N2 gas of a specified flow rate, to a head 3. As the nitrogen source, the following are used; heptamethyl disilazine, N, O-bistrimethylsilyl acetamide, tridimethylamino silane, etc., whose vapor pressue is approximate to TEOS. A gas system 22 has a mass flow controller 8 and an ozone generating equipment 5, and supplies O3 and O2 gas of a specified flow rate and ratio to the head 3. A film can be formed at a low temperature, excellent buried flatness can be obtained, and further an interlayer insulating film which has little water content and is excellent in film quality can be 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】この発明は、半導体装置の製造方
法に関し、より詳しくは、有機ソースとオゾンとを常圧
下で反応させる化学気相成長法(常圧CVD法)に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a semiconductor device, and more particularly to a chemical vapor deposition method (normal pressure CVD method) in which an organic source and ozone are reacted under normal pressure.

【0002】[0002]

【従来の技術】最近、半導体素子の高密度化,高集積化
に伴って多層配線を形成する必要から、層間絶縁膜形成
法として、低温(400℃程度)で成膜ができ、かつ、優
れた埋め込み平坦性を示すTEOS(テトラ・エトキシ
・シラン)−O3(オゾン)系常圧CVD法が有望視されて
いる。TEOS−O3系常圧CVD法は、TEOS(例え
ばN2ガスでバブリングしたもの)とO3(O2をキャリア
ガスとする)とを所定温度に保持した基板に導き、常圧
下で化学反応させて、上記基板にシリコン酸化膜を成長
させる方法である。
2. Description of the Related Art Recently, since it is necessary to form a multi-layered wiring in accordance with the densification and high integration of semiconductor elements, an interlayer insulating film forming method is capable of forming a film at a low temperature (about 400 ° C.) and is excellent. the embedded TEOS showing the flatness (tetraethoxysilane) -O 3 (ozone) an atmospheric pressure CVD method is promising. In the TEOS-O 3 -based atmospheric pressure CVD method, TEOS (for example, bubbling with N 2 gas) and O 3 (using O 2 as a carrier gas) are introduced into a substrate kept at a predetermined temperature, and a chemical reaction is performed under atmospheric pressure. Then, a silicon oxide film is grown on the substrate.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上記従
来のTEOS−O3系常圧CVD法では、成長した膜中
に水分換算で1〜3wt.%の水素が含まれる(Si−OH
の状態で存在する)ため、膜質が劣化したり、多層配線
間のオーミック接触が妨げられたりして、半導体素子の
信頼性が損なわれるという問題がある。なお、上記水素
は、温度700℃以上の熱処理を行うことによってある
程度低減することができるが、金属配線層の間に設けら
れる層間絶縁膜を形成する場合は、金属の信頼性を維持
する観点から、そのような高温の熱処理を実施すること
ができない。
[SUMMARY OF THE INVENTION However, in the conventional TEOS-O 3 based atmospheric pressure CVD method include 1 to 3 wt.% Hydrogen in water calculated on the grown layer (Si-OH
Therefore, there is a problem that the reliability of the semiconductor element is impaired due to deterioration of film quality and prevention of ohmic contact between the multilayer wirings. Note that the hydrogen can be reduced to some extent by performing heat treatment at a temperature of 700 ° C. or higher, but when an interlayer insulating film provided between metal wiring layers is formed, from the viewpoint of maintaining the reliability of the metal. , Such high temperature heat treatment cannot be carried out.

【0004】そこで、この発明の目的は、低温で成膜で
き、優れた埋め込み平坦性を示し、しかも、良好な膜質
の層間絶縁膜を形成できる半導体装置の製造方法を提供
することにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a semiconductor device which can be formed at a low temperature, exhibits excellent filling flatness, and can form an interlayer insulating film of good film quality.

【0005】[0005]

【課題を解決するための手段】上記目的を達成するた
め、この発明は、組成にSiを含む有機ソースとO3とを
基板に導き、上記有機ソースとO3とを常圧下で化学反
応させて、上記基板にシリコン酸化膜を成長させる半導
体装置の製造方法において、上記有機ソースに、組成に
窒素を含むソース(以下、「窒素ソース」という。)を添加
して成長を行うことを特徴としている。
In order to achieve the above object, the present invention introduces an organic source containing Si in its composition and O 3 into a substrate and chemically reacts the organic source with O 3 under normal pressure. In the method for manufacturing a semiconductor device in which a silicon oxide film is grown on the substrate, a source containing nitrogen in the composition (hereinafter, referred to as “nitrogen source”) is added to the organic source for growth. There is.

【0006】また、上記窒素ソースはヘプタメチルジシ
ラザン(化学式(CH3)3SiN(CH3)Si(CH3)3)であ
るのが望ましい。
The nitrogen source is preferably heptamethyldisilazane (chemical formula (CH 3 ) 3 SiN (CH 3 ) Si (CH 3 ) 3 ).

【0007】また、上記窒素ソースはN,O−ビス・ト
リメチルシリル・アセトアミド(化学式(CH3)C(OSi
(CH3)3)(NSi(CH3)3))であるのが望ましい。
The nitrogen source is N, O-bis-trimethylsilylacetamide (chemical formula (CH 3 ) C (OSi
It is preferably (CH 3 ) 3 ) (NSi (CH 3 ) 3 )).

【0008】また、上記窒素ソースはトリ・ジメチルア
ミノ・シラン(化学式((CH3)2N)3SiN)であるのが望
ましい。
The nitrogen source is preferably tridimethylaminosilane (chemical formula ((CH 3 ) 2 N) 3 SiN).

【0009】[0009]

【作用】膜中に取り込まれようとするOH基は、窒素ソ
ースに含まれる窒素Nによって置換される。すなわち、
Si−OHに代わってSi−Nが形成され、水素はH2
形で雰囲気中へ逃げる。したがって、膜中の水分量が減
少して膜質が良好なものとなる。なお、この発明の半導
体装置の製造方法は、有機ソース−O3系常圧CVD法
に属する。したがって、上記従来のTEOS−O3系常
圧CVD法と同様に、低温で成膜でき、優れた埋め込み
平坦性を示すことができる。
The OH group which is about to be taken into the film is replaced by the nitrogen N contained in the nitrogen source. That is,
Instead of the Si-OH Si-N is formed, hydrogen escapes into the atmosphere in the form of H 2. Therefore, the amount of water in the film is reduced and the film quality is improved. The semiconductor device manufacturing method of the present invention belongs to the organic source-O 3 -based atmospheric pressure CVD method. Therefore, similar to the conventional TEOS-O 3 -based atmospheric pressure CVD method, a film can be formed at a low temperature and excellent filling flatness can be exhibited.

【0010】また、上記窒素ソースがヘプタメチルジシ
ラザン,N,O−ビス・トリメチルシリル・アセトアミド
またはトリ・ジメチルアミノ・シランである場合、図2
に示すように、蒸気圧がTEOSと略等しいので、TE
OSソース(有機ソース)系に添加することが、バブリン
グによって簡単になされる。また、後述するように、成
長するシリコン酸化膜中から炭素を取り除く効果もあ
る。
When the nitrogen source is heptamethyldisilazane, N, O-bis-trimethylsilyl-acetamide or tri-dimethylamino-silane, FIG.
As shown in, the vapor pressure is almost equal to TEOS.
Addition to the OS source (organic source) system is easily made by bubbling. Further, as described later, it also has an effect of removing carbon from the growing silicon oxide film.

【0011】[0011]

【実施例】以下、この発明の半導体装置の製造方法を実
施例により詳細に説明する。
The method for manufacturing a semiconductor device of the present invention will be described in detail below with reference to embodiments.

【0012】図1は、この発明によりシリコン酸化膜を
成長するためのTEOS−O3系常圧CVD装置を示し
ている。この装置は、基板1を所定の温度に保持できる
ヒータ2と、上記基板1に面し、カバー4に覆われたデ
スパージョン・ヘッド3を備えている。上記デスパージ
ョン・ヘッド3の基板側3aに、ガスを噴出できるスリ
ット31,32が交互に設けられている。ヘッド3の下
部3bでは、スリット31に対して有機ソースを導入す
るガス系21が接続される一方、スリット32に対して
3およびO2ガスを導入するガス系22が接続されてい
る。上記ガス系21は、キャリアN2系21aと、TEO
Sソース系21bと、窒素ソース系21cとが合流したも
のである。キャリアN2系21aは、マスフローコントロ
ーラ9を有し、キャリアN2ガスを所定の流量でヘッド
3へ供給する。TEOSソース系21bは、マスフロー
コントローラ10と、TEOSソース16を溜めたソー
ス容器6とを有し、TEOSソース16を所定流量のN
2ガスでバブリングしてヘッド3へ供給する。窒素ソー
ス系21cは、マスフローコントローラ11と、窒素ソ
ース17を溜めたソース容器7とを有し、窒素ソース1
7を所定流量のN2ガスでバブリングしてヘッド3へ供
給する。ここで、窒素ソース17としては、蒸気圧がT
EOSに近いヘプタメチルジシラザン(化学式(CH3)3
SiN(CH3)Si(CH3)3)、N,O−ビス・トリメチル
シリル・アセトアミド(化学式(CH3)C(OSi(C
3)3)(NSi(CH3)3))、トリ・ジメチルアミノ・シラ
ン(化学式((CH3)2N)3SiN)などを使用する。一方、
ガス系22は、マスフローコントローラ8と、オゾン発
生装置5とを有し、O3およびO2ガスを所定の流量,比
率でヘッド3へ供給する。
FIG. 1 shows a TEOS-O 3 system atmospheric pressure CVD apparatus for growing a silicon oxide film according to the present invention. This apparatus comprises a heater 2 capable of holding the substrate 1 at a predetermined temperature, and a dispersion head 3 facing the substrate 1 and covered with a cover 4. On the substrate side 3a of the above diffusion head 3, slits 31 and 32 capable of ejecting gas are provided alternately. In the lower portion 3b of the head 3, a gas system 21 for introducing an organic source is connected to the slit 31, while a gas system 22 for introducing O 3 and O 2 gas is connected to the slit 32. The gas system 21 includes carrier N 2 system 21a and TEO.
The S source system 21b and the nitrogen source system 21c are merged. The carrier N 2 system 21a has a mass flow controller 9 and supplies the carrier N 2 gas to the head 3 at a predetermined flow rate. The TEOS source system 21b has a mass flow controller 10 and a source container 6 in which the TEOS source 16 is stored.
Bubbling with 2 gas is supplied to the head 3. The nitrogen source system 21c has a mass flow controller 11 and a source container 7 in which a nitrogen source 17 is stored.
7 is bubbled with a predetermined flow rate of N 2 gas and supplied to the head 3. Here, as the nitrogen source 17, the vapor pressure is T
Heptamethyldisilazane close to EOS (chemical formula (CH 3 ) 3
SiN (CH 3) Si (CH 3) 3), N, O- bis-trimethylsilyl-acetamide (formula (CH 3) C (OSi ( C
H 3 ) 3 ) (NSi (CH 3 ) 3 )), tri-dimethylamino silane (chemical formula ((CH 3 ) 2 N) 3 SiN) and the like are used. on the other hand,
The gas system 22 has a mass flow controller 8 and an ozone generator 5, and supplies O 3 and O 2 gas to the head 3 at a predetermined flow rate and ratio.

【0013】実際に成長を行う場合、ヒータ2によって
基板1の温度を400℃に設定し、TEOSソース1
6,窒素ソース17の温度をそれぞれ65℃に保つ。マ
スフローコントローラ9,10,11によって、キャリア
2ガスの流量を18リットル/min.、TEOSソース
16をバブリングするN2ガスの流量を1.8〜2.2リ
ットル/min.、窒素ソース17をバブリングするN2
スの流量を0.1〜2.0リットル/min.にそれぞれ設定
する。また、マスフローコントローラ8によってO2
スの流量を7.5リットル/min.に設定し、オゾン発生
装置5によってO2ガス中のO3を5wt.%に設定する。
このような成長条件で、基板1を図1において左右方向
に移動させつつ、スリット31,32を通して各ガスを
基板1に導いてシリコン酸化膜を成長させる。なお、反
応後のガスはヘッド3とカバー4との隙間33を通して
排気する。成長時間2分間で、優れた埋め込み特性を示
すシリコン酸化膜を約2000Åの厚さに成長させるこ
とができた。
When actually growing, the temperature of the substrate 1 is set to 400 ° C. by the heater 2 and the TEOS source 1
6. Keep the temperature of the nitrogen source 17 at 65 ° C. The mass flow controllers 9, 10 and 11 set the carrier N 2 gas flow rate to 18 liters / min., The TEOS source 16 bubbling N 2 gas flow rate to 1.8 to 2.2 liters / min., And the nitrogen source 17. The flow rate of the N 2 gas to be bubbled is set to each of 0.1 to 2.0 liter / min. Further, the mass flow controller 8 sets the flow rate of O 2 gas to 7.5 liters / min., And the ozone generator 5 sets O 3 in O 2 gas to 5 wt.%.
Under such growth conditions, while moving the substrate 1 in the left-right direction in FIG. 1, each gas is guided to the substrate 1 through the slits 31 and 32 to grow a silicon oxide film. The gas after the reaction is exhausted through the gap 33 between the head 3 and the cover 4. With a growth time of 2 minutes, a silicon oxide film having excellent burying characteristics could be grown to a thickness of about 2000Å.

【0014】実際に、成長した膜を評価したところ、表
1に示すように、窒素ソース17を添加した場合は、膜
中の水分量が0.1wt.%以下であり、従来(水分量1〜
3wt.%)に比して膜質を大幅に改善することができた。
また、窒素ソース17としてヘプタメチルジシラザン、
N,O−ビス・トリメチルシリル・アセトアミド、トリ
・ジメチルアミノ・シランを用いた場合は、それぞれ膜
中の炭素濃度を1018atm/cm3以下、すなわち、窒素ソ
ースを添加しないときのレベルにすることができた。こ
れは、これらのソースの蒸気圧がいずれもTEOSの蒸
気圧に近く(図2参照)、反応性が高いからだと考えられ
る。これに対して、窒素ソース17として蒸気圧が低い
ヘキサメチルジシラザン(化学式(CH3)3Si−(NH)−
Si(CH3)3)を用いた場合は、膜中の炭素濃度が1020
atm/cm3以下にしかならなかった。
When the grown film was actually evaluated, as shown in Table 1, when the nitrogen source 17 was added, the water content in the film was 0.1 wt. ~
(3 wt.%), The film quality could be improved significantly.
In addition, as the nitrogen source 17, heptamethyldisilazane,
When N, O-bis-trimethylsilylacetamide and tri-dimethylamino-silane are used, the carbon concentration in each film should be 10 18 atm / cm 3 or less, that is, the level when no nitrogen source is added. I was able to. It is considered that this is because the vapor pressures of these sources are close to the vapor pressure of TEOS (see FIG. 2) and the reactivity is high. In contrast, the vapor pressure is low hexamethyldisilazane as a nitrogen source 17 (chemical formula (CH 3) 3 Si- (NH ) -
When Si (CH 3 ) 3 ) is used, the carbon concentration in the film is 10 20
It was below atm / cm 3 .

【表1】 [Table 1]

【0015】[0015]

【発明の効果】以上より明らかなように、この発明の半
導体装置の製造方法は、有機ソース−O3系常圧CVD
法において、有機ソースに対して窒素ソース、すなわち
組成に窒素を含むソースを添加して成長を行うので、低
温で成膜でき、優れた埋め込み平坦性を示し、しかも、
水分量が少ない良好な膜質の層間絶縁膜を形成すること
ができる。
As is apparent from the above, the method of manufacturing a semiconductor device according to the present invention is an organic source-O 3 -based atmospheric pressure CVD method.
In the method, since the growth is performed by adding a nitrogen source to the organic source, that is, a source containing nitrogen, it is possible to form a film at a low temperature and to show excellent filling flatness.
It is possible to form an interlayer insulating film having a good film quality with a small amount of water.

【0016】また、上記窒素ソースがヘプタメチルジシ
ラザン、N,O−ビス・トリメチルシリル・アセトアミ
ドまたはトリ・ジメチルアミノ・シラン(化学式((C
3)2N)3SiN)である場合、バブリングによって上記
有機ソースに簡単に添加することができる。しかも、反
応性を高めて膜中の炭素濃度を低減することができ、さ
らに膜質を良好にすることができる。
The nitrogen source is heptamethyldisilazane, N, O-bis-trimethylsilyl-acetamide or tri-dimethylamino-silane (chemical formula ((C
In the case of H 3 ) 2 N) 3 SiN), it can be easily added to the above organic source by bubbling. In addition, the reactivity can be increased to reduce the carbon concentration in the film, and the film quality can be improved.

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

【図1】 この発明によりシリコン酸化膜を成長するの
に用いるTEOS−O3系常圧CVD装置を示す図であ
る。
FIG. 1 is a diagram showing a TEOS-O 3 system atmospheric pressure CVD apparatus used for growing a silicon oxide film according to the present invention.

【図2】 各窒素ソースの蒸気圧と温度との関係を示す
図である。
FIG. 2 is a diagram showing a relationship between vapor pressure and temperature of each nitrogen source.

【符号の説明】[Explanation of symbols]

1 基板 2 ヒータ 3 デスパージョン・ヘッド 4 カバー 5 オゾン発生装置 6,7 ソース容器 8,9,10,11 マスフローコントローラ 21 有機ソースを導入するガス系 21a キャリアN2系 21b 有機ソース系 21c 窒素ソース系 22 O3およびO2ガスを導入するガス系1 Substrate 2 Heater 3 Dispersion head 4 Cover 5 Ozone generator 6,7 Source container 8,9,10,11 Mass flow controller 21 Gas system introducing organic source 21a Carrier N 2 system 21b Organic source system 21c Nitrogen source system 22 Gas system for introducing O 3 and O 2 gas

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 組成にSiを含む有機ソースとO3とを基
板に導き、上記有機ソースとO3とを常圧下で化学反応
させて、上記基板にシリコン酸化膜を成長させる半導体
装置の製造方法において、 上記有機ソースに、組成に窒素を含むソースを添加して
成長を行うことを特徴とする半導体装置の製造方法。
1. Manufacturing of a semiconductor device in which an organic source containing Si in the composition and O 3 are introduced to a substrate, and the organic source and O 3 are chemically reacted under normal pressure to grow a silicon oxide film on the substrate. A method of manufacturing a semiconductor device according to the method, wherein a growth is performed by adding a source containing nitrogen to the organic source.
【請求項2】 上記組成に窒素を含むソースはヘプタメ
チルジシラザンであることを特徴とする請求項1に記載
の半導体装置の製造方法。
2. The method for manufacturing a semiconductor device according to claim 1, wherein the source containing nitrogen in the composition is heptamethyldisilazane.
【請求項3】 上記組成に窒素を含むソースはN,O−
ビス・トリメチルシリル・アセトアミドであることを特
徴とする請求項1に記載の半導体装置の製造方法。
3. A source containing nitrogen in the above composition is N, O--
The method of manufacturing a semiconductor device according to claim 1, wherein the method is bis-trimethylsilyl-acetamide.
【請求項4】 上記組成に窒素を含むソースはトリ・ジ
メチルアミノ・シランであることを特徴とする請求項1
に記載の半導体装置の製造方法。
4. The source containing nitrogen in the composition is tridimethylaminosilane.
A method of manufacturing a semiconductor device according to item 1.
JP26723192A 1992-02-05 1992-10-06 Method for manufacturing semiconductor device Expired - Fee Related JP2945217B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US08/098,927 US5459108A (en) 1992-10-06 1993-07-29 Normal pressure CVD process for manufacture of a semiconductor device through reaction of a nitrogen containing organic source with ozone
KR1019930015075A KR970005678B1 (en) 1992-10-06 1993-08-03 Nitrogen source addition in lpcvd method reacted with inorganic source and ozon

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1981892 1992-02-05
JP4-19818 1992-02-05

Publications (2)

Publication Number Publication Date
JPH05283403A true JPH05283403A (en) 1993-10-29
JP2945217B2 JP2945217B2 (en) 1999-09-06

Family

ID=12009903

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26723192A Expired - Fee Related JP2945217B2 (en) 1992-02-05 1992-10-06 Method for manufacturing semiconductor device

Country Status (1)

Country Link
JP (1) JP2945217B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103305808A (en) * 2013-06-13 2013-09-18 林嘉佑 Production device for silicon oxide film and production method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103305808A (en) * 2013-06-13 2013-09-18 林嘉佑 Production device for silicon oxide film and production method thereof

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