JPS6161154A - Negative type resist composition and formation of fine resist pattern using said composition - Google Patents
Negative type resist composition and formation of fine resist pattern using said compositionInfo
- Publication number
- JPS6161154A JPS6161154A JP59182589A JP18258984A JPS6161154A JP S6161154 A JPS6161154 A JP S6161154A JP 59182589 A JP59182589 A JP 59182589A JP 18258984 A JP18258984 A JP 18258984A JP S6161154 A JPS6161154 A JP S6161154A
- Authority
- JP
- Japan
- Prior art keywords
- rays
- pattern
- resist
- dry etching
- composition
- 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
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は半導体装置等の製造に際し、電離放射線によっ
て微細レジストパターンを形成する際に用いるネガ型レ
ジスト組成物及び該組成物を用いた微細レジストパター
ン形成方法に関する。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a negative resist composition used when forming a fine resist pattern using ionizing radiation in the manufacture of semiconductor devices, etc., and a fine resist using the composition. This invention relates to a pattern forming method.
(従来の技術)
近年、半導体装置等の高集積化への要求が著しく高まっ
て居り、これに伴ない、かかる高集積化のための微細パ
ターン形成に関する各種技術的要請が非常に厳しいもの
となってきている。(Prior Art) In recent years, the demand for higher integration of semiconductor devices, etc. has increased significantly, and with this, various technical requirements regarding the formation of fine patterns for such higher integration have become extremely strict. It's coming.
かかる技術的要請に応するための微細加工技術として、
電子線、X線、短波長紫外線等の電離放射線によりレジ
ストパターンを形成し、イオンプラズマなどを用いたド
ライエツチングによりレジストパターンを精度よく基板
に転写する方法が特に必要とされている。As a microfabrication technology to meet such technical demands,
There is a particular need for a method in which a resist pattern is formed using ionizing radiation such as electron beams, X-rays, and short wavelength ultraviolet rays, and the resist pattern is accurately transferred onto a substrate by dry etching using ion plasma or the like.
ところで、このような微細加工用のレジスト材料の特性
として、当然のことながら高解像性、高感度及び高ドラ
イエツチング耐性を有することが要求されている。しか
しながら、従来一般に知られているレジスト材料は必ず
しもこれらの特性を満たしているとは限らない。By the way, as a matter of course, the characteristics of such resist materials for microfabrication are required to have high resolution, high sensitivity, and high dry etching resistance. However, conventionally known resist materials do not necessarily satisfy these characteristics.
(発明が解決しようとする問題点)
例えば、高解像性ポジ制電離放射線レジスl−材料とし
て広く知られているポリメチルメタクリレ=1、(以下
PMMAと略す)はそのドライエツチング耐性が十分で
なく、又他のポジ型レジストとして知られているメタク
リル系ポリマーやポリブテン−1−スルホン等は解像力
が上記PMMAより劣るばかりでなく同様にドライエツ
チング耐性も十分とは云えない。(Problems to be Solved by the Invention) For example, polymethylmethacrylate=1 (hereinafter abbreviated as PMMA), which is widely known as a high-resolution positive anti-ionizing radiation resist l-material, has sufficient dry etching resistance. In addition, other known positive type resists such as methacrylic polymers and polybutene-1-sulfone not only have a resolution inferior to that of PMMA but also have insufficient dry etching resistance.
一方、ネガ型レジストとして知られているポリグリシジ
ルメタクリレ−1・等のアクリル系レジストも前記PM
MAと同様にドライエツチング耐性が十分とは云い難い
。そ(7て他のポリスチレン又はポリスチレンに感応基
を付与した例えばクロロメチル化ポリスチレンは、ベン
セン環を含み上記ドライエツチング耐性に1憂れている
材料ではあるがこれらは概ねゲル化を利用した架橋型i
ノジス1−であり、しかもこれらのゲルが現像液によっ
て膨潤するため、例えば0.5pm以下の微細パターン
では所謂スカムやブリッジの発生が顕著で良好なパター
ン形成に支障を招く問題がある。On the other hand, acrylic resists such as polyglycidyl methacrylate-1, which is known as a negative resist, also
Like MA, it cannot be said that the dry etching resistance is sufficient. (7) Other polystyrene or polystyrene with a sensitive group, such as chloromethylated polystyrene, contains a benzene ring and is a material that suffers from the above dry etching resistance, but these are generally cross-linked materials that utilize gelation. i
Furthermore, since these gels are swollen by the developer, so-called scum and bridges occur prominently in fine patterns of, for example, 0.5 pm or less, which impede good pattern formation.
更に遠紫外線を用いるリソグラフィは、サブミクロンの
転写を可能とししかもスループットが高いのでかかる目
的のための有力なパターン形成方法として知られている
が、しかし上述したような耐ドライエツチング性の高い
レジストは通常遠紫外線領域での吸収が大きく良好な矩
形のパターンが得られない欠点が免がれなかった。Furthermore, lithography using deep ultraviolet rays is known as an effective pattern forming method for such purposes because it enables submicron transfer and has a high throughput. However, resists with high dry etching resistance as mentioned above are Usually, the drawback is that absorption in the far ultraviolet region is large and good rectangular patterns cannot be obtained.
(問題を解決するt、=めの手段)
この発明は、上記ドライエツチング耐性に優れ、高解像
力を有し、しかも実用的な感度を有するネガ型レジスト
材料としてのビニルフェノールとメチルメタクリレート
の共重合体のナフトキノンジアジドスルホン酸エステル
であり、そしてこのレジスト材料による皮膜を基板上に
形成し、350nm〜450 nmの紫外線を全面照射
した後遠紫外線にて選択照射しパターニングするレジス
トパターンの形成方法である。(Means for solving the problem) This invention is directed to the copolymerization of vinyl phenol and methyl methacrylate as a negative resist material that has excellent dry etching resistance, high resolution, and practical sensitivity. This is a resist pattern forming method in which a film of this resist material is formed on a substrate, the entire surface is irradiated with ultraviolet rays of 350 nm to 450 nm, and then selectively irradiated with deep ultraviolet rays for patterning. .
この発明において、上記レジスト材料におけるビニルフ
ェノールとメチルメタクリレートとの共重合比は、該メ
チルメタクリレートが75モル%以下であることが望ま
17い。この比率を超えると耐1−ライエツチング性が
低下し好ましくない。又前記ビニルフェノールに対する
エステル化度は20モル%以上であることが特に望まれ
、該エステル化度がと第1」り低い場合には同様に本発
明の効果が不充分になり好まL <ない。In this invention, it is desirable that the copolymerization ratio of vinyl phenol and methyl methacrylate in the resist material is 75 mol % or less. Exceeding this ratio is undesirable because the 1-ly etching resistance decreases. Further, it is particularly desirable that the degree of esterification of the vinyl phenol is 20 mol% or more; if the degree of esterification is lower than 1", the effect of the present invention will be insufficient, so it is preferable that L<no. .
(発明の作用)
この発明は後記実施例によって明らかなように上記問題
を略−掃し得るが、特にそのドライエツチング耐性が優
れているのは、レジスト材料のモノマーユニットにフェ
ニル基やナフチル基を含むtコめであり、又その解像力
が向上するのは電離放射線によるネガ化が架橋によるネ
ガ化ではなく、構造変化によるネガ化が生ずる乙とによ
るためと考えられる。これば本発明において形成された
レジストパターンがジメチルホルムアミド等の有機溶媒
に容易に溶解することから概ね推察されることである。(Function of the Invention) This invention can almost eliminate the above-mentioned problems, as will be clear from the examples below, but its particularly excellent dry etching resistance is due to the fact that phenyl or naphthyl groups are added to the monomer units of the resist material. The reason why the resolution is improved is thought to be that the negative conversion due to ionizing radiation is not due to crosslinking, but due to structural changes. This is generally inferred from the fact that the resist pattern formed in the present invention is easily dissolved in an organic solvent such as dimethylformamide.
又、メチルメタクリレートとビニルフェノールを主鎖と
(7にことにまり遠紫外線領域での光吸収を適切にする
ことができ、このため短波長紫外線でのりソグラフイに
よりレジストパターンの矩形化が容易に行はれるのであ
る。更に本発明のレジストが高感度である理由は、必ら
ずしも明確にし得tこわけではないが、本発明のレジス
トが低ドーズでしかも現像液に対して適切に不溶化する
ためと考えられる。In addition, methyl methacrylate and vinyl phenol are combined with the main chain (part 7) to ensure appropriate light absorption in the far ultraviolet region, making it easy to make the resist pattern rectangular by lithography using short wavelength ultraviolet rays. Furthermore, the reason why the resist of the present invention has high sensitivity is that the resist of the present invention has a low dose and is properly insolubilized in the developer, although it is not necessarily clear. This is thought to be for the purpose of
(実施例) 以下実施例によりこの発明を具体的に説明する。(Example) The present invention will be specifically explained below with reference to Examples.
実施例1
ビニルフェノールとメチルメタクリレートの重合体のナ
フトキノンジアジドスルホン酸エステル(ビニルフェノ
ールに対するエステル化率50%。Example 1 Naphthoquinonediazide sulfonic acid ester of a polymer of vinylphenol and methyl methacrylate (esterification rate with respect to vinylphenol: 50%).
NR−1)をメチルセロソルブアセテートに溶解しこの
溶液をフィルターで濾過し、シリコン基板上に1.0μ
mの厚さで塗布して、皮膜すなわちレジスト膜を形成し
た。得られたレジスト膜を有する基板を80℃の温度で
30分間熱処理した後、20KVの電子線によりパター
ンを描画した。尚そのドーズ量は10μC/cwtとし
た。その後、メチルセロソルブアセテ−1・5対シクロ
/\キサン1の混合溶液を用い23℃で30秒間現像し
た。得られたレジストパターンを走査型電子顕微鏡(S
EM)にて観察したところ、0.2μmのラインアンド
スペースが解像さねていることが認められた。NR-1) was dissolved in methyl cellosolve acetate, this solution was filtered, and a 1.0 μl layer was placed on a silicon substrate.
The film was coated to a thickness of m to form a film, that is, a resist film. After heat-treating the substrate having the obtained resist film at a temperature of 80° C. for 30 minutes, a pattern was drawn using a 20 KV electron beam. The dose amount was 10 μC/cwt. Thereafter, development was performed at 23° C. for 30 seconds using a mixed solution of methyl cellosolve acetate 1.5 and cyclo/\xane 1. The obtained resist pattern was examined under a scanning electron microscope (S
When observed using EM), it was found that lines and spaces of 0.2 μm were not resolved.
実施例2
ビニルフェノールとメチルメタクリレ−トノ共重合体の
ナフトキノンジアジドスルホン酸エステル(ビニルフェ
ノールに対するエステル化率25%、NR−2)を用い
実施例1と同様にしてレジストを調整し、シリコン基板
上に0.8μmの厚さて塗布しレジスト膜を形成した。Example 2 A resist was prepared in the same manner as in Example 1 using naphthoquinonediazide sulfonic acid ester of vinylphenol and methyl methacrylate copolymer (esterification rate of vinylphenol: 25%, NR-2), and a silicon substrate was prepared. A resist film was formed by applying the resist film to a thickness of 0.8 μm.
1@られなレジスト膜を有する基板を80℃で30分間
熱処理した後、20 KVの電子線てドーズi15μC
/cryで描画した。1. After heat-treating the substrate with the resist film at 80°C for 30 minutes, it was heated with a 20 KV electron beam at a dose of 15 μC.
Drawn with /cry.
その夜更に100℃で30分ベーキングを行い、シクロ
ヘキサノンにて23℃で20秒間現像を行った。得られ
たl/シストパターンを同様にSEMにて観察したとこ
ろ、0.371mのラインアンドスペースで解像されて
いることが認められた。That night, it was further baked at 100°C for 30 minutes, and developed with cyclohexanone at 23°C for 20 seconds. When the obtained l/cyst pattern was similarly observed using SEM, it was found that it was resolved with a line and space of 0.371 m.
実施例3
実施例1と同様にしてNR−1の皮膜をシリコン基板形
成し、プリベークを行った後、酸素プラズマによるドラ
イエツチング耐性を試験した。この場合エンチング装置
として平行平板型の装置を用い、出力密度: 0.0
8 w/crZ、 02ガス流量:20SCCM、ガス
圧:50Paとして10分間エツチングを行い、タリス
テップによりエツチング量を測定したところ、50nm
であることが確認された。比較のために上記PMMAに
ついて同一条件で試験を行ったがそのエツチング量ば2
00 nmであった。Example 3 A film of NR-1 was formed on a silicon substrate in the same manner as in Example 1, prebaked, and then tested for dry etching resistance using oxygen plasma. In this case, a parallel plate type device is used as the enching device, and output density: 0.0
Etching was performed for 10 minutes at 8 w/crZ, 02 gas flow rate: 20 SCCM, and gas pressure: 50 Pa, and the etching amount was measured by Talystep, and it was found to be 50 nm.
It was confirmed that For comparison, a test was conducted on the above PMMA under the same conditions, but the etching amount was only 2.
00 nm.
実施例4
実施例1と同様にシリコン基板へのレジスト皮膜の形成
及びベークを行った。この1/シスト皮膜に、250W
の超高圧水銀ランプにより350〜450 nmの紫外
線を一括照射した。然る後500WのXe−Hgランプ
からの主として200〜280nm(コールドミラーに
より280 nmより長い波長の光はカット)の短波長
紫外線で、マスクを密着1に
介在下に10秒間露光を行った。Example 4 A resist film was formed on a silicon substrate and baked in the same manner as in Example 1. 250W to this 1/cyst film
UV rays of 350 to 450 nm were irradiated all at once using an ultra-high pressure mercury lamp. Thereafter, exposure was carried out for 10 seconds with short-wavelength ultraviolet light mainly from 200 to 280 nm (light with wavelengths longer than 280 nm was cut by a cold mirror) from a 500 W Xe-Hg lamp with a mask in close contact 1.
次に酢酸エチルにて、23℃で15秒間現像を行ないパ
ターニングを行ったところ0.5μmのラインアンドス
ペースのネガパターンが解像されたことが確認された。Next, patterning was performed by developing with ethyl acetate at 23° C. for 15 seconds, and it was confirmed that a 0.5 μm line-and-space negative pattern was resolved.
そして更にレジス)〜膜の断面形状をSEMにより観察
したところ基板上のレジスト層の断面形状は概ね矩形で
あった。Furthermore, when the cross-sectional shape of the resist film was observed by SEM, the cross-sectional shape of the resist layer on the substrate was generally rectangular.
(発明の効果)
本発明は以」二の説明から明らかな如く、特にその耐ド
ライエツチング性が著しく向上された微細パターンが非
常に高い感度で形成されるなど上述の問題を解消し得る
ものであり、特に高度に集積された半導体装置等の製造
に用いて好適でありその工業的利用価値は極めて高い。(Effects of the Invention) As is clear from the following explanation, the present invention can solve the above-mentioned problems, such as forming fine patterns with extremely high sensitivity, especially with significantly improved dry etching resistance. In particular, it is suitable for use in manufacturing highly integrated semiconductor devices, etc., and its industrial value is extremely high.
Claims (2)
合体のナフトキノンジアジドスルホン酸エステルである
ことを特徴とする電子線、X線、短波長紫外線等の電離
放射線用ネガ型レジスト組成物。(1) A negative resist composition for use with ionizing radiation such as electron beams, X-rays, and short-wavelength ultraviolet rays, which is a naphthoquinonediazide sulfonic acid ester of a copolymer of vinylphenol and methyl methacrylate.
ートの共重合体のナフトキノンジアジドスルホン酸エス
テルをレジスト材料として形成した皮膜に350〜45
0nmの紫外線を一括照射した後、200〜300nm
の短波長紫外線によりパターニングすることを特徴とす
る微細レジストパターン形成方法。(2) A film formed on a substrate using naphthoquinonediazide sulfonic acid ester, a copolymer of vinylphenol and methyl methacrylate, as a resist material with a 350-450
After irradiating with 0nm ultraviolet rays, 200-300nm
A fine resist pattern forming method characterized by patterning using short wavelength ultraviolet rays.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59182589A JPS6161154A (en) | 1984-09-03 | 1984-09-03 | Negative type resist composition and formation of fine resist pattern using said composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59182589A JPS6161154A (en) | 1984-09-03 | 1984-09-03 | Negative type resist composition and formation of fine resist pattern using said composition |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6161154A true JPS6161154A (en) | 1986-03-28 |
JPH0480377B2 JPH0480377B2 (en) | 1992-12-18 |
Family
ID=16120931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP59182589A Granted JPS6161154A (en) | 1984-09-03 | 1984-09-03 | Negative type resist composition and formation of fine resist pattern using said composition |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6161154A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62273529A (en) * | 1986-05-10 | 1987-11-27 | チバ−ガイギ− アクチエンゲゼル シヤフト | Image formation |
JPS6373522A (en) * | 1986-09-16 | 1988-04-04 | Matsushita Electronics Corp | Manufacture of semiconductor device |
JPS63133626A (en) * | 1986-11-26 | 1988-06-06 | Matsushita Electronics Corp | Manufacture of semiconductor device |
JPS63200531A (en) * | 1987-02-17 | 1988-08-18 | Matsushita Electronics Corp | Manufacture of semiconductor device |
JPS6435438A (en) * | 1987-07-01 | 1989-02-06 | Ciba Geigy Ag | Image formation |
JPS6489424A (en) * | 1987-09-30 | 1989-04-03 | Matsushita Electronics Corp | Resist-pattern forming method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4948403A (en) * | 1972-05-05 | 1974-05-10 | ||
JPS50127619A (en) * | 1974-03-27 | 1975-10-07 | ||
JPS50141404A (en) * | 1974-04-30 | 1975-11-13 |
-
1984
- 1984-09-03 JP JP59182589A patent/JPS6161154A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4948403A (en) * | 1972-05-05 | 1974-05-10 | ||
JPS50127619A (en) * | 1974-03-27 | 1975-10-07 | ||
JPS50141404A (en) * | 1974-04-30 | 1975-11-13 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62273529A (en) * | 1986-05-10 | 1987-11-27 | チバ−ガイギ− アクチエンゲゼル シヤフト | Image formation |
JPS6373522A (en) * | 1986-09-16 | 1988-04-04 | Matsushita Electronics Corp | Manufacture of semiconductor device |
JPS63133626A (en) * | 1986-11-26 | 1988-06-06 | Matsushita Electronics Corp | Manufacture of semiconductor device |
JPS63200531A (en) * | 1987-02-17 | 1988-08-18 | Matsushita Electronics Corp | Manufacture of semiconductor device |
JPS6435438A (en) * | 1987-07-01 | 1989-02-06 | Ciba Geigy Ag | Image formation |
JPS6489424A (en) * | 1987-09-30 | 1989-04-03 | Matsushita Electronics Corp | Resist-pattern forming method |
Also Published As
Publication number | Publication date |
---|---|
JPH0480377B2 (en) | 1992-12-18 |
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Legal Events
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EXPY | Cancellation because of completion of term |