JPH02304562A - Blank for photomask - Google Patents

Blank for photomask

Info

Publication number
JPH02304562A
JPH02304562A JP1127110A JP12711089A JPH02304562A JP H02304562 A JPH02304562 A JP H02304562A JP 1127110 A JP1127110 A JP 1127110A JP 12711089 A JP12711089 A JP 12711089A JP H02304562 A JPH02304562 A JP H02304562A
Authority
JP
Japan
Prior art keywords
thin film
metallic thin
electron beam
layer
photomask
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.)
Pending
Application number
JP1127110A
Other languages
Japanese (ja)
Inventor
Tadayoshi Imai
今井 忠義
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1127110A priority Critical patent/JPH02304562A/en
Publication of JPH02304562A publication Critical patent/JPH02304562A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To facilitate a dry etching process and to form fine patterns with high accuracy by forming different kinds of metallic thin films in multiple layers on a glass substrate. CONSTITUTION:A light shieldable metallic thin film 2a is first formed as a 1st layer by sputtering on the glass substrate 1 which is mask substrate, then the light shieldable metallic thin film 2b of the different kind is formed as a 2nd layer by sputtering thereon. Further, an electron beam positive resist is applied thereon. Patterns are exposed on the electron beam positive resist 3 by an electron beam and the resist is subjected to developing and post baking; further, the light shieldable metallic thin film 2b of the upper layer is subjected to the dry etching and thereafter, the electron beam positive resist 3 is peeled. The light shieldable metallic thin film 2a of the lower layer is then dry etched to remove the remaining light shieldable metallic thin film 2b of the upper layer over the entire surface. The photomask which has the sufficient dry etching resistance, is finer and has the high accuracy is formed in this way.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明はフォトマスクを形成する際に用いるブランク
スの構造に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of blanks used in forming photomasks.

〔従来の技術〕[Conventional technology]

近年、半導体集積回路は益々高集積化するとともに、レ
クチルの微細化および要求品質が厳しくなってきており
、フォトマスクのポジドライプロセスが必要不可欠なも
のとなっている。
In recent years, as semiconductor integrated circuits have become more and more highly integrated, reticle miniaturization and quality requirements have become stricter, and a positive dry process for photomasks has become indispensable.

第2図は従来のフォトマスク用ブランクスを示した図で
ある。マスク基板であるガラス基板上1に遮光性金属薄
1fg2(例えばクロムもしくはモリブデンシリサイド
)がスパッタ形成され、その上に電子線ポジレジスト3
(例えばEBR−9)が塗布されている。
FIG. 2 is a diagram showing a conventional photomask blank. A light-shielding metal thin film 1fg2 (for example, chromium or molybdenum silicide) is sputter-formed on a glass substrate 1, which is a mask substrate, and an electron beam positive resist 3 is applied thereon.
(for example, EBR-9).

そして、露光、現像、ボストベーク、ウェットあるいは
ドライエツチング等のプロセスを経てフォトマスクの形
成を行っていた。
A photomask is then formed through processes such as exposure, development, post-baking, wet or dry etching.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記従来のフォトマスク用ブランクスを用いて、ポジド
ライエツチングプロセスによるフォトマスクを形成する
ことは可能ではあったが、市販されている電子線ポジレ
ジストの中で十分な耐ドライエツチング性を有したもの
はなく、微細化かつ高精度なフォトマスクの形成は難し
いという問題点があった。
Although it was possible to form a photomask using the above-mentioned conventional photomask blanks by a positive dry etching process, this photomask had sufficient dry etching resistance among the commercially available electron beam positive resists. However, there was a problem in that it was difficult to form a fine and highly accurate photomask.

〔課題を解決するための手段〕[Means to solve the problem]

この発明はポジドライエツチングプロセスによるフォト
マスク形成に用いるブランクスに係るものであり、マス
ク基板上に異種の金属薄膜を多層に形成したことを特徴
とするものである。
The present invention relates to a blank used for forming a photomask by a positive dry etching process, and is characterized in that thin films of different metals are formed in multiple layers on a mask substrate.

〔作用〕[Effect]

この発明に係るフォトマスク用ブランクスは。 The photomask blanks according to the present invention are as follows.

マスク基板上に異種の金属薄膜を多層にスパッタ形成し
ている。したがって、このフォトマスク用ブランクスに
よりフォトマスクを作成する際、上層の金属薄膜をレジ
ストの代わりとして利用して下層の金属薄膜をドライエ
ツチングできるので、ポジエツチングドライプロセスが
容易となり、微細パターン形成が可能となる。
Multilayer metal thin films of different types are formed by sputtering on a mask substrate. Therefore, when creating a photomask using this photomask blank, the upper metal thin film can be used in place of a resist to dry-etch the lower metal thin film, which facilitates the positive etching dry process and enables the formation of fine patterns. becomes.

〔実施例〕〔Example〕

以下、この発明の一実施例を図面について説明する。第
1図は本発明に係るフォトマスク用ブランクスの一実施
例を示す断面図である。
An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a photomask blank according to the present invention.

マスク基板であるガラス基板1上にまず一層目として遮
光性金属薄膜2a(例えばクロム約800人)をスパッ
タ形成し、次に二層目として異種の遮光性金属薄膜2b
(例えばモリブデントリサイド約400人)をスパッタ
形成し、さらにその上に電子線ポジレジスト(例えばE
BR−95500人)を塗布している。
First, a light-shielding metal thin film 2a (for example, about 800 chrome) is sputtered as a first layer on a glass substrate 1, which is a mask substrate, and then a different kind of light-shielding metal thin film 2b is formed as a second layer.
(for example, about 400 molybdenum trisides) is sputter-formed, and then an electron beam positive resist (for example, E
BR-95,500 people).

次に、このブランクスを用いたフォトマスク形成方法に
ついて説明する。まず、電子ビームにより電子線ポジレ
ジスト3上にパターンを露光し、現像、ボストベークを
行う(パターン形成)、そしてCF4系ガスで上層の遮
光性金属薄!(モリブデンシリサイド1)2bについて
ドライエツチングを行い、その後、電子線ポジレジスト
3をはく離する0次に、CC1,系ガスで下層の遮光性
金属薄膜(クロム膜) 2aをドライエツチングし、残
りの上層遮光性金属薄膜2bを全面除去する。
Next, a method of forming a photomask using this blank will be explained. First, a pattern is exposed on the electron beam positive resist 3 using an electron beam, and then developed and post-baked (pattern formation). (Molybdenum silicide 1) 2b is dry-etched, and then the electron beam positive resist 3 is removed.Next, the lower layer light-shielding metal thin film (chromium film) 2a is dry-etched using CC1 and a system gas, and the remaining upper layer is dry-etched. The light-shielding metal thin film 2b is completely removed.

従来のブランクスを用いたフォトマスク形成においては
電子線ポジレジスト3が十分な耐ドライエツチング性を
有していながった。したがって、レジストの薄膜化およ
び断面形状がシャープに仕上げられなかった。
In conventional photomask formation using blanks, the electron beam positive resist 3 did not have sufficient dry etching resistance. Therefore, it was not possible to make the resist thin and the cross-sectional shape sharp.

しかし、以上のようにして形成されたフすi−マスク用
ブランクスを用いると、レジストのrIJIi化および
断面形状をシャープに仕上げることができる。
However, by using the frame I-mask blank formed as described above, it is possible to make the resist rIJIi and to have a sharp cross-sectional shape.

なお、上記実施例では一層目をクロム膜、二層目をモリ
ブデンシリサイド膜としたが、その逆であっても同様の
効果が実現する。
In the above embodiment, the first layer is a chromium film and the second layer is a molybdenum silicide film, but the same effect can be achieved even if the film is reversed.

また、上記実施例では二層目の薄膜を一層目の薄膜のエ
ツチング後に除去を行ったが、除去を行わなくても同様
の効果が実現する。
Further, in the above embodiment, the second layer thin film was removed after etching the first layer thin film, but the same effect can be achieved even if the second layer thin film is not removed.

さらに、上記実施例では、クロム膜、モリブデンシリサ
イド膜の組み合せを用いたが、他の金属薄膜で反応性ガ
スが異なるものであればいずれの組み合せにおいても同
様の効果が実現する。
Further, in the above embodiment, a combination of a chromium film and a molybdenum silicide film was used, but the same effect can be achieved with any combination of other metal thin films with different reactive gases.

さらにまた、上記実施例では二層膜を用いたが、二層膜
以上を用いても同様の効果が実現し得る。
Furthermore, although a two-layer film was used in the above embodiment, the same effect can be achieved by using a two-layer film or more.

〔発明の効果〕〔Effect of the invention〕

以上のようにこの発明に係るフォトマスク用ブランクス
は、マスク基板上に、異種の金属薄膜を多層に形成して
いる。したがって、このブランクスを用いてフすトマス
クを形成する際に、反応性ガスが異なることを応用して
、上層の金属薄膜をレジストとして代用できる。その結
果、ポジドライエツチングプロセスが容易となり、かつ
、高精度な微細パターン形成に有利となる。
As described above, the photomask blank according to the present invention has multiple layers of different metal thin films formed on a mask substrate. Therefore, when forming a foot mask using this blank, the upper metal thin film can be used as a resist by taking advantage of the fact that the reactive gases are different. As a result, the positive dry etching process becomes easy and is advantageous for forming fine patterns with high precision.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の一実施例によるフォトマスク用ブラ
ンクスを示す側面断面図、第2図は従来の7オ!・マス
ク用ブランクスを示す側面断面図である。 図中、1はマスク基板(ガラス基板)、2aは1層目の
遮光性金属薄膜、2bは2層目の遮光性金属薄膜、3は
電子線ポジレジストである。 なお、図中同一符号は同−又は相当部分を示す。
FIG. 1 is a side sectional view showing a photomask blank according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional 7-o! - It is a side sectional view showing mask blanks. In the figure, 1 is a mask substrate (glass substrate), 2a is a first-layer light-shielding metal thin film, 2b is a second-layer light-shielding metal thin film, and 3 is an electron beam positive resist. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

【特許請求の範囲】[Claims] マスク基板と、該マスク基板上に多層に形成された異種
の金属薄膜を有するフォトマスク用フラックス。
A photomask flux having a mask substrate and a multilayer metal thin film of different types formed on the mask substrate.
JP1127110A 1989-05-19 1989-05-19 Blank for photomask Pending JPH02304562A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1127110A JPH02304562A (en) 1989-05-19 1989-05-19 Blank for photomask

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1127110A JPH02304562A (en) 1989-05-19 1989-05-19 Blank for photomask

Publications (1)

Publication Number Publication Date
JPH02304562A true JPH02304562A (en) 1990-12-18

Family

ID=14951855

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1127110A Pending JPH02304562A (en) 1989-05-19 1989-05-19 Blank for photomask

Country Status (1)

Country Link
JP (1) JPH02304562A (en)

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