JP2004356595A - Method of manufacturing silicon-based film containing carbon using cathode coupling-type plasma cvd equipment - Google Patents
Method of manufacturing silicon-based film containing carbon using cathode coupling-type plasma cvd equipment Download PDFInfo
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 23
- 239000010703 silicon Substances 0.000 title claims abstract description 23
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 60
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 claims abstract description 53
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000005268 plasma chemical vapour deposition Methods 0.000 claims abstract description 12
- 125000004433 nitrogen atom Chemical group N* 0.000 claims abstract description 10
- 125000004430 oxygen atom Chemical group O* 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 6
- 239000012495 reaction gas Substances 0.000 claims description 38
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 7
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000010408 film Substances 0.000 claims 7
- 239000012528 membrane Substances 0.000 claims 1
- 239000010409 thin film Substances 0.000 claims 1
- 239000000376 reactant Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 18
- 239000000203 mixture Substances 0.000 description 10
- 238000010168 coupling process Methods 0.000 description 9
- 238000005859 coupling reaction Methods 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 230000008878 coupling Effects 0.000 description 7
- 239000000758 substrate Substances 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- 229910004541 SiN Inorganic materials 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
Description
【0001】
【発明の属する技術分野】
本発明は、プラズマCVD装置を用いたシリコン系膜の製造方法に関する。
【0002】
【従来の技術】
従来、SiN、SiO2、SiON等のシリコン系膜はモノシラン(SiH4)を用いて作製されていた。しかし、SiH4は爆発性があるため、安全のための付帯設備が法的に定められているとともに、使用にも許可を必要とする。そこで、安全性、設備コスト、入手容易性等を考慮して、近年、SiH4に代わって有機シランの一つであるヘキサメチルジシラザン(HMDS)がシリコン系膜の作製に用いられている。
【0003】
HMDSは炭化水素を含有する有機シランであることから、通常、それを用いて作製した膜中には炭素が混入する。この炭素は、シリコン系膜の所期の特性である絶縁性等を損なうものであるため、これまでは、HMDSに水素ガスを添加するなどの方法で、膜中に混入する炭素量をできるだけ少なくするようにしている(特許文献1参照)。しかし、炭素が膜を形成する他原子と完全に結合してネットワークに組み込まれるようにすれば、フリーの電子は生じず、絶縁特性が低下することはなくなると思われる。
【0004】
本発明者らは、このような観点から、炭素が膜を形成する他原子と完全に結合してネットワークに組み込まれていると思われる炭素含有シリコン系膜を開発し、これについての発表を既に行っている(非特許文献1、非特許文献2参照)。
このシリコン系膜はHMDSを原料ガスとしてカソードカップリング型プラズマCVD装置を用いて作製するものであり、SiH4を用いた場合と同等の絶縁性を示すばかりでなく、炭素含有量の増加に従い膜の屈折率が大きくなり、また、短波長領域における良好な光透過性等優れた光学特性を示す。
【0005】
【特許文献1】
特開平9−82705号公報
【非特許文献1】
大岸厚文、本山慎一、立田利明、辻理、金高健二、西井準治、「2002年度春季第49回応用物理学関係連合講演会予稿集」、2002年、 p.628
【非特許文献2】
大岸厚文、本山慎一、澤井巳喜夫、立田利明、辻理、「第21回材料科学シンポジウム予稿集」、2002年、pp.187−188
【0006】
【発明が解決しようとする課題】
本発明者らが既に発表した方法によれば、RF電力値を変化させることによりシリコン系膜の含有炭素量を変化させることができる。しかし、RF電力値を変化させると膜厚や膜質の変化等により膜の物性が変化してしまう。
【0007】
本発明はこのような点を考慮して成されたものであり、その目的とするところはHMDSを原料ガスとしてカソードカップリング型プラズマCVD装置を用いて炭素を含有するシリコン系膜の製造方法において、RF電力値を変化させる以外の方法で、膜の含有炭素量を調整する方法を提供することにある。
【0008】
【課題を解決するための手段】
上記課題を解決するために成された本発明に係るシリコン系膜の製造方法は、カソードカップリング型プラズマCVD装置を用いて、a)ヘキサメチルジシラザンと、b)窒素原子含有ガス又は酸素原子含有ガス又は窒素原子含有ガスと酸素原子含有ガスの混合ガスと、を混合したガスを反応ガスとして、所定量の炭素を含有するシリコン系膜を製造する方法において、反応ガスに水素ガスを混合し、その混合比を変化させることによりシリコン系膜の炭素含有量を変化させることを特徴とする。
【0009】
【発明の実施の形態及び効果】
本発明に係る方法ではカソードカップリング型のプラズマCVD装置を用いて、基板を載置した下部電極側にRF電力を投入してプラズマを発生させる。カソードカップリング型では、基板付近に形成されたシースによりイオンが基板に引き寄せられるため、基板表面での反応性がアノードカップリング型よりも高く、シースとプラズマとの境界付近で多量のイオンが形成される。このイオンを負バイアスにより引き込むことで、低温で、かつ、大きな成膜速度で効率よく、膜の作製を行うことができる。
【0010】
SiN膜を作製する際は、ヘキサメチルジシラザン(HMDS)及び窒素原子含有ガスとしてNH3やN2を使用する。SiO2膜を作製する際は、HMDS及び酸素原子含有ガスとしてO2又はN2Oを使用する。SiON膜を作製する際は、HMDS及び窒素原子含有ガスと酸素原子含有ガスの混合ガスを使用し、SiON膜中のO原子とN原子の割合は、窒素原子含有ガスと酸素原子含有ガスの混合比によって定まる。以下においては、HMDSを第一反応ガスと、窒素原子含有ガス、酸素原子含有ガス、及び窒素原子含有ガスと酸素原子含有ガスの混合ガスを第二反応ガスと呼ぶ。
なお、以上のガスを用いて膜の作製を行う際は、脱水のため、HMDSにSiCl4を1atm%程度添加することが望ましい。
【0011】
反応室における第一反応ガスと第二反応ガスの比は、第二反応ガスとして窒素原子含有ガス、酸素原子含有ガスのいずれ(か又は両方)を使用する場合も1:10〜1:1000の範囲内とする。HMDSの含有量がこの範囲よりも少ない場合は、短波長領域における良好な光透過性やその他の光学特性を十分に得ることができない。
HMDSの含有量がこの範囲よりも多いと、炭素が過度にシリコン系膜内に入り込み、ネットワークにより固定されない炭素が増加して膜の絶縁性を低下させる。
【0012】
第一反応ガスと第二反応ガスの比が上記の範囲内となるようにした上で、水素ガスを反応ガスに混合して、反応ガスと水素ガスの混合比を変化させることにより、膜の含有炭素量を変化させる。ここで、水素ガスは、第一反応ガスと混合してもよいし、第二反応ガスと混合してもよいし、第一反応ガスと第二反応ガスを混合したものと水素ガスを混合してもよい。このように水素ガスを反応ガスに混合することにより、各反応ガスのガス分圧の微調整が可能となり、その結果、膜の含有炭素量を細かく調整することが可能となる。このH2ガスの混合による含有炭素量の調整方法によれば、RF電力値を変化させることにより調整する方法と比較して、より微妙な含有炭素量の調整が可能となる。
【0013】
【実施例】
本実施例では、図1及び図2に示すカソードカップリング型プラズマCVD装置を用いて、水素ガスを第二反応ガスと混合し、この混合比を変化させることによりシリコン系膜に含まれる炭素量を変化させた。
【0014】
カソードカップリング型プラズマCVD装置10には、図1に示されるように、密閉されたチャンバ11内にシャワー板を兼ねた上部電極12及び下部電極13が略平行に配され、上部電極12は接地され、下部電極13はブロッキングコンデンサ15を介してRF電源16に接続されている。反応ガスはシャワー板を兼ねた上部電極12よりチャンバ11内に供給され、基板14上で成膜が行われる。
【0015】
ガス系統は図2に示すようになっている。チャンバ11と第二反応ガス源21を接続する配管22には、原料タンク23からの配管24及び水素ガス源20からの配管が接続されている。原料タンク23からの配管24には、マスフローコントローラ(MFC)25が設けられ、また、その配管24の他方の端部には、パージ用ガス源26が接続されている。なお、パージ用ガスとしては窒素ガス等を用いることができる。原料タンク23にはヒータ(図示せず)が設けられ、更に、原料タンク23及びマスフローコントローラ25は恒温槽27内に設けられている。
【0016】
ヒータにより原料タンク23を加熱し、恒温槽27を所定の温度に維持することにより、原料タンク23内のHMDSがガス化する。ガス化したHMDS(第一反応ガス)は、マスフローコントローラ25を介して、H2と混合された第二反応ガスとともにチャンバ11内に供給される。なお、気化したHMDSを液化させないため、途中の配管24、22やマスフローコントローラ25、バルブ28、29等にもリボンヒータを巻き、加熱しておく。また、第二反応ガスの流量が第一反応ガス(HMDS)の流量よりも大きい場合、反応ガスの配管22内圧力により第一反応ガス(HMDS)のチャンバ11への供給が妨げられる。このような場合は、第一反応ガス配管24に巻いたリボンヒータの温度を上げることにより、第一反応ガスの供給を確保することができるようになる。
【0017】
なお、以下の実施例においては、原料タンク23の温度を50℃、恒温槽27の温度を55℃、マスフローコントローラ25の温度を85℃、第一反応ガス配管24の温度を85℃、第一反応ガスの流れに対してマスフローコントローラ25よりも上流側のバルブ28の温度を85℃、マスフローコントローラ25よりも下流側のバルブ29の温度を100℃、マスフローコントローラ25より下流側の配管24の温度を100℃とした。
【0018】
膜中の炭素量変化
図1の装置を用いて、第二反応ガスである窒素原子含有ガス(NH3)にH2を混合してSiN膜の成膜を行った。この際、H2+NH3の総流量を200sccmで一定としつつ、H2とNH3の混合比を変化させた。HMDS流量は、300℃で成膜した場合は10sccm、80℃で成膜した場合は2sccmとし、RF電力は300Wとした。300℃で成膜を行った場合の混合ガス中のH2の割合(H2/(NH3+H2))と成膜速度の関係、H2の割合と膜組成の関係、H2の割合と膜の屈折率の関係を図3(a)〜(c)に、80℃で成膜を行った場合のH2の割合と成膜速度の関係、H2の割合と膜組成の関係、H2の割合と膜の屈折率の関係を図4(a)〜(c)に示す。なお、膜組成はSiで規格化した構成比で表す。
【0019】
図3及び図4のいずれにおいても、H2の割合が増すにつれて炭素の割合が増加し、それに従い、膜の屈折率が大きくなっている。これは、窒素源の供給量が少なくなるに従い、代わりにHMDSの炭素が膜に取り込まれているためと考えられる。このように、窒素原子含有ガスの供給量を減らし水素ガスの量を増やすことにより、HMDSの炭素が膜に取り込まれ、膜の屈折率が変化することがわかる。
【0020】
なお、以上で作製した最大40%の炭素を含有するSiN膜は、いずれも目視においては無色透明であった。このことから、炭素は遊離して存在するのではなく、SiNのネットワーク中に組み込まれ、SiNCの状態で存在していると思われる。
なお、H2割合=1の時の膜は、Nが混入したSiC膜と考えられる。
【0021】
次に、第二反応ガスとしてO2を使用し、O2にH2を混合することでO2の流量比を減少させ、膜中に炭素を混入させることを試みた。H2の割合と組成の関係及びH2の割合と膜の屈折率の関係を図5(a),(b)に示す。なお、成膜速度は1500Å/minとした。図5に示されるように、O2の流量比が減少するに従い、膜中の炭素量が増加した。これにより、本発明に係る方法により作製したSiO2膜にも炭素を混入させることが可能であって、炭素の混入により、膜の屈折率が変化することが確認された。
【0022】
なお、窒素原子含有ガス(NH3)にH2を混合した場合は、Siに対するCの割合が60%のとき、膜に茶色の着色が見られた。これはSiNネットワークに組み込まれない、フリーの状態で存在する炭素が多量に存在して、膜の構造が変化するためであると考えられる。
【0023】
以上では、NH3又はO2とH2の混合比を変化させることにより、SiN膜又はSiO2膜中に含まれる炭素量を変化させる例について記載したが、SiON膜についても同様の方法により含有炭素量を変化させることができる。
【0024】
また、以上では、第二反応ガスに水素ガス(H2)を混合する方法によりシリコン系膜の炭素含有量を変化させたが、第一反応ガスに水素ガスを混合する方法、第一反応ガスと第二反応ガスを混合した反応ガスに更に水素ガスを混合する方法、第一反応ガスと第二反応ガスと水素ガスを同時に混合する方法によっても炭素含有量を変化させることは可能である。
【0025】
膜のアルカリ耐性
SiH4を用いたSiO2膜、SiH4を用いたSiN膜及び本発明に係る方法によるSiN膜(成膜温度150℃、HMDS流量5sccm、H2/(H2+NH3)=0〜0.75、圧力67Pa、RF電力300W)のpH9のアルカリ溶液に対する耐性評価を行った。アルカリ溶液としてはKOHを使用し、これに3日間膜を浸すことにより評価を行ったところ、エッチング速度はSiH4を用いて作製したSiO2膜(7.45nm/day)>SiH4を用いて作製したSiN膜(6.55nm/day)>本発明に係る方法によるSiN膜(4nm/day)であり、本発明に係る方法により作製したSiN膜、即ち炭素含有SiN膜が、最もアルカリ耐性が高いことがわかった。なお、本発明に係る方法によるSiN膜においては、膜中の炭素含有量が多いほどエッチング速度が小さくなり、H2/(H2+NH3)=0.75の条件において、膜はアルカリ溶液に全く侵されなくなった。
【図面の簡単な説明】
【図1】実施例で用いるカソードカップリング型プラズマCVD装置の概略構成図。
【図2】実施例で用いるカソードカップリング型プラズマCVD装置のガス系統図。
【図3】(a)300℃で成膜したSiN膜の、H2の割合と成膜速度の関係を示すグラフ、(b)(a)の膜のH2の割合と膜の組成の関係を示すグラフ、(c)(a)の膜のH2の割合と屈折率の関係を示すグラフ。
【図4】(a)80℃で成膜したSiN膜の、H2の割合と成膜速度の関係を示すグラフ、(b)(a)の膜のH2の割合と膜の組成の関係を示すグラフ、(c)(a)の膜のH2の割合と屈折率の関係を示すグラフ。
【図5】(a)酸素原子含有ガスとしてO2を使用した場合の、H2の割合と膜の組成の関係を示すグラフ、(b)(a)の膜のH2の割合と屈折率の関係を示すグラフ。
【符号の説明】
10…カソードカップリング型プラズマCVD装置
11…チャンバ
12…上部電極
13…下部電極
14…基板
15…ブロッキングコンデンサ
16…RF電源
20…水素ガス源
21…第二反応ガス源
22、24…配管
23…原料タンク
24…第一反応ガス配管
25…マスフローコントローラ
26…パージ用ガス源
27…恒温槽
28、29…バルブ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a silicon-based film using a plasma CVD apparatus.
[0002]
[Prior art]
Conventionally, silicon-based films such as SiN, SiO 2 , and SiON have been manufactured using monosilane (SiH 4 ). However, since SiH 4 has explosive properties, incidental facilities for safety are legally stipulated, and permission is required for use. Therefore, in consideration of safety, equipment cost, availability, and the like, hexamethyldisilazane (HMDS), which is one of organic silanes, has recently been used instead of SiH 4 for producing a silicon-based film.
[0003]
Since HMDS is a hydrocarbon-containing organic silane, carbon is usually mixed in a film produced using the same. Since this carbon impairs the desired properties of the silicon-based film, such as insulating properties, the amount of carbon mixed into the film has been reduced to a minimum by a method such as adding hydrogen gas to HMDS. (See Patent Document 1). However, if the carbon is completely bonded to the other atoms forming the film and incorporated into the network, free electrons are not generated, and it is considered that the insulating properties do not deteriorate.
[0004]
From such a viewpoint, the present inventors have developed a carbon-containing silicon-based film in which carbon is considered to be completely bonded to other atoms forming the film and incorporated into the network. (See
This silicon-based film is produced using a cathode-coupling plasma CVD apparatus using HMDS as a source gas, and exhibits not only the same insulating properties as when SiH 4 is used but also the film as the carbon content increases. Has a large refractive index, and exhibits excellent optical characteristics such as good light transmittance in a short wavelength region.
[0005]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 9-82705 [Non-Patent Document 1]
Atsufumi Ogishi, Shinichi Motoyama, Toshiaki Tateda, Osamu Tsuji, Kenji Kantaka, Junji Nishii, "Preprints of the 49th Annual Lecture Meeting on Applied Physics, Spring 2002," p. 628
[Non-patent document 2]
Atsumi Ogishi, Shinichi Motoyama, Mikio Sawai, Toshiaki Tateda, Osamu Tsuji, "Preliminary Proceedings of the 21st Material Science Symposium," 2002, pp. 187-188
[0006]
[Problems to be solved by the invention]
According to the method already announced by the present inventors, the carbon content of the silicon-based film can be changed by changing the RF power value. However, changing the RF power value changes the physical properties of the film due to changes in film thickness, film quality, and the like.
[0007]
The present invention has been made in view of the above points, and an object of the present invention is to provide a method for manufacturing a silicon-containing film containing carbon using a cathode coupling type plasma CVD apparatus using HMDS as a source gas. Another object of the present invention is to provide a method for adjusting the carbon content of a film by a method other than changing the RF power value.
[0008]
[Means for Solving the Problems]
The method for producing a silicon-based film according to the present invention, which has been made to solve the above-mentioned problems, comprises a) hexamethyldisilazane, and b) a nitrogen-containing gas or an oxygen atom using a cathode-coupled plasma CVD apparatus. In a method for producing a silicon-based film containing a predetermined amount of carbon, a mixed gas of a mixed gas of a gas containing a nitrogen atom and a gas containing an oxygen atom is used as a reaction gas, hydrogen gas is mixed with the reaction gas. The carbon content of the silicon-based film is changed by changing the mixing ratio.
[0009]
Embodiments and effects of the present invention
In the method according to the present invention, plasma is generated by applying RF power to the lower electrode side on which the substrate is mounted, using a cathode-coupled plasma CVD apparatus. In the cathode coupling type, ions are attracted to the substrate by the sheath formed near the substrate, so the reactivity on the substrate surface is higher than in the anode coupling type, and a large amount of ions are formed near the boundary between the sheath and the plasma Is done. By drawing in these ions with a negative bias, a film can be efficiently formed at a low temperature and at a high film formation rate.
[0010]
When fabricating a SiN film, NH 3 or N 2 is used as hexamethyldisilazane (HMDS) and a nitrogen atom-containing gas. When producing a SiO 2 film, O 2 or N 2 O is used as HMDS and an oxygen atom-containing gas. When preparing the SiON film, a mixed gas of HMDS and a gas containing a nitrogen atom and a gas containing an oxygen atom is used. The ratio of O atoms and N atoms in the SiON film is determined by mixing the gas containing a nitrogen atom and the gas containing an oxygen atom. Determined by the ratio. Hereinafter, HMDS is referred to as a first reaction gas, a nitrogen-containing gas, an oxygen-containing gas, and a mixed gas of a nitrogen-containing gas and an oxygen-containing gas as a second reactive gas.
Note that when a film is formed using the above gases, it is preferable to add approximately 1 atm% of SiCl 4 to HMDS for dehydration.
[0011]
The ratio between the first reaction gas and the second reaction gas in the reaction chamber is 1:10 to 1: 1000 even when using either (or both) a nitrogen atom-containing gas and an oxygen atom-containing gas as the second reaction gas. Within the range. When the content of HMDS is smaller than this range, it is not possible to sufficiently obtain good light transmittance in a short wavelength region and other optical characteristics.
If the content of HMDS is larger than this range, carbon excessively enters the silicon-based film, and carbon not fixed by the network increases, thereby lowering the insulating property of the film.
[0012]
After the ratio of the first reactant gas and the second reactant gas is within the above range, hydrogen gas is mixed with the reactant gas, and the mixture ratio of the reactant gas and the hydrogen gas is changed to thereby form a film. Change the carbon content. Here, the hydrogen gas may be mixed with the first reaction gas, may be mixed with the second reaction gas, or may be a mixture of the first reaction gas and the second reaction gas and the hydrogen gas. You may. By mixing the hydrogen gas with the reaction gas in this manner, the gas partial pressure of each reaction gas can be finely adjusted, and as a result, the carbon content of the film can be finely adjusted. According to the method of adjusting the carbon content by mixing the H 2 gas, it is possible to more finely adjust the carbon content as compared with the method of adjusting by changing the RF power value.
[0013]
【Example】
In this embodiment, hydrogen gas is mixed with the second reaction gas using the cathode coupling type plasma CVD apparatus shown in FIGS. 1 and 2, and the mixing ratio is changed to change the amount of carbon contained in the silicon-based film. Was changed.
[0014]
As shown in FIG. 1, in a cathode-coupling type
[0015]
The gas system is as shown in FIG. A
[0016]
The HMDS in the
[0017]
In the following examples, the temperature of the
[0018]
Using the apparatus of the carbon content changes <br/> Figure 1 in the film, film formation was carried out in the SiN film by mixing with H 2 in nitrogen-containing gas as the second reaction gas (NH 3). At this time, the mixing ratio of H 2 and NH 3 was changed while the total flow rate of H 2 + NH 3 was kept constant at 200 sccm. The HMDS flow rate was 10 sccm when the film was formed at 300 ° C., 2 sccm when the film was formed at 80 ° C., and the RF power was 300 W. The ratio of H 2 mixed gas in the case of performing film formation at 300 ℃ (H 2 / (NH 3 + H 2)) and the relationship between the deposition rate, the relationship between the ratio and the film composition of H 2, the ratio of H 2 3 (a) to 3 (c) show the relationship between the ratio of H 2 and the film formation rate when the film was formed at 80 ° C., the relationship between the ratio of H 2 and the film composition, FIGS. 4A to 4C show the relationship between the ratio of H 2 and the refractive index of the film. The film composition is represented by a composition ratio standardized by Si.
[0019]
3 and 4, the proportion of carbon increases as the proportion of H 2 increases, and accordingly, the refractive index of the film increases. This is presumably because as the supply amount of the nitrogen source decreases, carbon of HMDS is taken into the film instead. As described above, it can be seen that by reducing the supply amount of the nitrogen atom-containing gas and increasing the amount of the hydrogen gas, the carbon of HMDS is taken into the film, and the refractive index of the film changes.
[0020]
Each of the SiN films containing up to 40% of carbon produced as described above was visually colorless and transparent. From this, it is considered that carbon is not present in a free state, but is incorporated in a network of SiN and exists in a state of SiNC.
The film when the H 2 ratio is 1 is considered to be a SiC film in which N is mixed.
[0021]
Then, by using the O 2 as the second reaction gas, the O 2 to reduce the flow rate of O 2 by mixing H 2, an attempt was made to incorporate carbon into the film. FIGS. 5A and 5B show the relationship between the ratio of H 2 and the composition and the relationship between the ratio of H 2 and the refractive index of the film. The film formation rate was 1500 ° / min. As shown in FIG. 5, as the O 2 flow ratio decreased, the amount of carbon in the film increased. Thus, it was confirmed that carbon could be mixed in the SiO 2 film produced by the method according to the present invention, and that the refractive index of the film was changed by the carbon mixing.
[0022]
When H 2 was mixed with the nitrogen-containing gas (NH 3 ), the film was colored brown when the ratio of C to Si was 60%. This is presumably because a large amount of free carbon, which is not incorporated in the SiN network, is present and the structure of the film changes.
[0023]
In the above, the example in which the amount of carbon contained in the SiN film or the SiO 2 film is changed by changing the mixing ratio of NH 3 or O 2 and H 2 has been described, but the SiON film is also contained by the same method. The carbon content can be varied.
[0024]
Further, in the above, the carbon content of the silicon-based film was changed by a method of mixing hydrogen gas (H 2 ) with the second reaction gas. It is also possible to change the carbon content by a method in which hydrogen gas is further mixed with a reaction gas obtained by mixing the first and second reaction gases, and a method in which the first reaction gas, the second reaction gas, and hydrogen gas are simultaneously mixed.
[0025]
SiO 2 film using alkali-resistant SiH 4 , SiN film using SiH 4 , and SiN film according to the method of the present invention (
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a cathode coupling type plasma CVD apparatus used in an embodiment.
FIG. 2 is a gas system diagram of a cathode coupling type plasma CVD apparatus used in the embodiment.
3A is a graph showing the relationship between the H 2 ratio and the film formation rate of the SiN film formed at 300 ° C. FIG. 3B is a relationship between the H 2 ratio and the film composition of the film in FIG. graph showing the a graph showing the relationship between the ratio between the refractive index of H 2 film (c) (a).
4A is a graph showing the relationship between the H 2 ratio and the film formation rate of a SiN film formed at 80 ° C., and FIG. 4B is a relationship between the H 2 ratio and the film composition of the film in FIG. graph showing the a graph showing the relationship between the ratio between the refractive index of H 2 film (c) (a).
FIG. 5 (a) is a graph showing the relationship between the ratio of H 2 and the composition of the film when O 2 is used as the oxygen atom-containing gas, and (b) the ratio of H 2 and the refractive index of the film of (a). The graph which shows the relationship.
[Explanation of symbols]
DESCRIPTION OF
Claims (4)
反応ガスに水素ガスを混合し、その混合比を変化させることによりシリコン系膜の炭素含有量を変化させることを特徴とするシリコン系膜の製造方法。Using a cathode-coupled plasma CVD apparatus, a gas obtained by mixing a) hexamethyldisilazane and b) a nitrogen-containing gas or an oxygen-containing gas or a mixed gas of a nitrogen-containing gas and an oxygen-containing gas is used. In a method for producing a silicon-based film containing a predetermined amount of carbon as a reaction gas,
A method for producing a silicon-based film, comprising mixing a hydrogen gas with a reaction gas and changing a mixing ratio thereof to change a carbon content of the silicon-based film.
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