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JPS59139033A - Photomask blank - Google Patents

Photomask blank

Info

Publication number
JPS59139033A
JPS59139033A JP58012904A JP1290483A JPS59139033A JP S59139033 A JPS59139033 A JP S59139033A JP 58012904 A JP58012904 A JP 58012904A JP 1290483 A JP1290483 A JP 1290483A JP S59139033 A JPS59139033 A JP S59139033A
Authority
JP
Japan
Prior art keywords
film
oxide
photomask blank
chlorine
light
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
JP58012904A
Other languages
Japanese (ja)
Other versions
JPS6237382B2 (en
Inventor
Kotaro Kasama
笠間 幸太郎
Masao Ushida
正男 牛田
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.)
Hoya Corp
Original Assignee
Hoya 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 Hoya Corp filed Critical Hoya Corp
Priority to JP58012904A priority Critical patent/JPS59139033A/en
Publication of JPS59139033A publication Critical patent/JPS59139033A/en
Publication of JPS6237382B2 publication Critical patent/JPS6237382B2/ja
Granted legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F1/00Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
    • G03F1/38Masks having auxiliary features, e.g. special coatings or marks for alignment or testing; Preparation thereof
    • G03F1/46Antireflective coatings
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F1/00Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
    • G03F1/50Mask blanks not covered by G03F1/20 - G03F1/34; Preparation thereof
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F1/00Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
    • G03F1/54Absorbers, e.g. of opaque materials

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Preparing Plates And Mask In Photomechanical Process (AREA)

Abstract

PURPOSE:To obtain antistatic effect and reflection preventive effect of a photomask prepd. by plasma etching using chlorine or similar gas by providing a light shielding metallic film of a specific element on a glass base plate and forming a reflection preventive film of an oxide of a specified element thereon. CONSTITUTION:A light shielding metallic film 3 is formed on a glass base plate 1 using Si, Ge, Sb, or Au. A reflection preventive film 4 is formed further on the film 3 using an oxide of Si, Ge, or Sb. On one hand, a transparent conductive film 2 is formed using an oxide of Fe, In, Re, Pb, Zn, Ni, or Co between the base plate 1 and the film 3. The photomask in accordance with this constitution is easily etched at the film 3 and the film 4 by the plasma etching using chlorine or similar gas, but the conductive film 2 has resistance to the etching. Easily etchable films 3 and 4 serve as masking material, and hardly etchable conductive film 2 has antistatic effect, therefore, the breakage due to electric charge and multiple reflection are both prevented.

Description

【発明の詳細な説明】 本発明はフォトマスクブランクに関し、より詳しくはプ
ラズマエツチング用のフォトマスクブランクに関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to photomask blanks, and more particularly to photomask blanks for plasma etching.

従来、この種のフォトマスクブランクとしてtま、ガラ
ス基板上にタンタル薄膜(膜厚:約1000人)を形成
し、そのタンタル薄膜上にフォトレジスト(膜厚:約5
000人)を塗布したものが知られて(Aる。このブラ
ンクは、露光、現像及びエッチングを行い、タンタル薄
膜上に所定のレジストパターンを形成した後、平行平板
型又は円筒型のプラズマエツチング装置の槽内に挿入し
、チャンバー内を一度真空にして、CF4ガスを導入す
る。そして、ラジオ波(通常13.513 Ml−12
>をかけることにより、プラズマを発生させて、露出さ
れた部分のタンタル薄膜がエツチングされて、レジスト
パターン部分のタンタル薄膜を残し、所定の遮光性パタ
ーンを形成したフォトマスクを得ていた。
Conventionally, as a photomask blank of this type, a tantalum thin film (thickness: approximately 1,000 mm) was formed on a glass substrate, and a photoresist (film thickness: approximately 5 mm) was formed on the tantalum thin film.
000 people) is known (A). After this blank is exposed, developed and etched to form a prescribed resist pattern on the tantalum thin film, it is processed using a parallel plate type or cylindrical plasma etching device. Once the chamber is evacuated, CF4 gas is introduced.Then, radio waves (usually 13.513 Ml-12
>, plasma was generated and the exposed portion of the tantalum thin film was etched away, leaving the tantalum thin film in the resist pattern portion, to obtain a photomask in which a predetermined light-shielding pattern was formed.

しかしながら、このフォトマスクは、微細パターンの静
電破壊を起こしたり、あるいは被転写物との間で多重反
射を起こして、パターン精度を低下させる欠点があった
。それがため、微細加工性及び制御性等に優れたプラズ
マエツチングが紹介されていながら、プラズマエツチン
グ用のフォトマスクブランクが未開発であった。
However, this photomask has the drawback of causing electrostatic damage to the fine pattern or causing multiple reflections with the transferred object, reducing pattern accuracy. For this reason, although plasma etching, which has excellent microprocessability and controllability, has been introduced, a photomask blank for plasma etching has not yet been developed.

本発明の目的は、上記した欠点を除去し、微細パターン
の静電破壊を防止し、被転写物との間での多重反射を防
止した、塩素系ガスを用いた反応性イオンエツチング等
のプラズマエツチング用)4トマスクブランクを提供す
ることである。
The purpose of the present invention is to eliminate the above-mentioned drawbacks, prevent electrostatic damage to fine patterns, and prevent multiple reflections with the transferred material by using plasma such as reactive ion etching using chlorine-based gas. The purpose of the present invention is to provide four mask blanks (for etching).

このような目的を達成させるため、本発明は、塩素系ガ
スのプラズマ種に対して耐性のある透明導電膜と、同プ
ラズマ種に対してエツチングされやずい遮光性金属膜及
び反射防止膜を見い出し、これらの膜をガラス基板上に
成膜することにより構成されている。
In order to achieve these objectives, the present invention has discovered a transparent conductive film that is resistant to chlorine-based gas plasma species, and a light-shielding metal film and an antireflection film that are resistant to etching by the plasma species. , is constructed by forming these films on a glass substrate.

以下、本発明を実施例図面を参照して説明する。Hereinafter, the present invention will be explained with reference to embodiment drawings.

第1図に示すように、透明なアルミノボロシリケートガ
ラス基板((株)保谷硝子製:LE−30>等から製作
されたガラス基板1上に、インジウム金属をターゲット
として反応性スパッタリング法により酸化インジウム<
 I n、o3)の透明導電膜(膜厚:約300人)2
を成膜し、その上にゲルマニウムをターゲットとしてス
パッタリング法によりゲルマニウム(Ge )の遮光性
金属膜(膜厚:約1300人)3を成膜し、更にその上
に石英をターゲットとして反応性スパッタリング法によ
り二酸化シリコン(SiO2)の反射防止膜(膜厚:約
700人)4を成II美してフォトマスクブランクを製
作した。
As shown in FIG. 1, indium oxide is deposited on a glass substrate 1 made of a transparent aluminoborosilicate glass substrate (manufactured by Hoya Glass Co., Ltd.: LE-30) by reactive sputtering using indium metal as a target. <
In, o3) transparent conductive film (film thickness: approx. 300 people) 2
A light-shielding metal film (thickness: approx. 1,300 layers) of germanium (Ge) 3 was formed on top of it by sputtering using germanium as a target, and then a reactive sputtering method using quartz as a target. A photomask blank was manufactured by forming an antireflection film (thickness: about 700 layers) of silicon dioxide (SiO2).

このフォトマスクブランクの分光反射率は、波長430
nlllの光に対して15%であった。
The spectral reflectance of this photomask blank is at wavelength 430.
It was 15% for nllll light.

このフォトマスクブランクは、第2図に示すように、先
ずフォトレジスト(膜厚:約5000A > 5を塗布
しく同図(a))、露光、現像を行って、1μm程度の
レジストパターン51を作成しく同図(b))、これを
CCl24ガスを用いて反応性イオンエツチングを行う
ことにより、レジストパターン51のない部分の露出さ
れた二酸化シリコン膜4とゲルマニウム躾3をエツチン
グして反射防止パターン41と遮光性パターン31を形
成した(同図(C))。ここで、酸化インジウム膜2の
存在を確認するために、02プラズマ中で、レジストパ
ターン51を灰化し、再びCCU4Cl3ガス又反応性
イオンエツチングを行うことにより、反射防止パターン
41と遮光性パターン31を全てエツチングしたく同図
(d〉)。このときの酸化インジウム膜2のシート抵抗
を測定した結果、1.5にΩ/口程度の導電性を確保し
ていることが判明した。
As shown in FIG. 2, this photomask blank is first coated with a photoresist (film thickness: approx. 5000A>5 (FIG. 2(a)), exposed and developed to create a resist pattern 51 of approximately 1 μm. (b)), by performing reactive ion etching using CCl24 gas, the exposed silicon dioxide film 4 and germanium film 3 where there is no resist pattern 51 are etched to form an anti-reflection pattern 41. A light-shielding pattern 31 was formed (FIG. 3(C)). Here, in order to confirm the presence of the indium oxide film 2, the resist pattern 51 is ashed in 02 plasma, and the anti-reflection pattern 41 and the light-shielding pattern 31 are removed by performing CCU4Cl3 gas or reactive ion etching again. I want to etch everything (d). As a result of measuring the sheet resistance of the indium oxide film 2 at this time, it was found that the conductivity was approximately 1.5 Ω/hole.

以上のように、本発明によれば、塩素系ガスのプラズマ
種に対してエツチングされやすい遮光性金属及び反射防
止膜用酸化物をマスク材として、エツチングされにくい
酸化物を透明導電膜としてそれぞれ使用することにより
、塩素系ガスによるプラズマエツチングによって製作さ
れるフォトマスクについて帯電防止効果及び反射防止効
果を得ることができる。
As described above, according to the present invention, a light-shielding metal and an oxide for antireflection film, which are easily etched by chlorine-based gas plasma species, are used as mask materials, and an oxide that is difficult to be etched is used as a transparent conductive film. By doing so, it is possible to obtain an antistatic effect and an antireflection effect on a photomask manufactured by plasma etching using chlorine gas.

上記実施例では、透明導電膜と遮光性金属膜と反射防止
膜の3層膜を形成したが、そのうち透明導電膜と遮光性
金属膜から成る2層のものは静電破壊防止のフォトマス
クブランクとして使用することができ、また、遮光性金
属膜と反射防止膜から成る2層のものは反射防止のフォ
トマスクブランクとして使用することができる。
In the above example, a three-layer film consisting of a transparent conductive film, a light-shielding metal film, and an anti-reflection film was formed, but the two-layer film consisting of a transparent conductive film and a light-shielding metal film was used as a photomask blank to prevent electrostatic damage. Furthermore, a two-layered mask consisting of a light-shielding metal film and an antireflection film can be used as an antireflection photomask blank.

また、他の実施例としては、本発明に係る透明導電膜と
して酸化インジウムの他に酸化鉄(Fe304ン、酸化
レニウム(Rez07) 、11f化鉛(P bsOJ
、酸化亜鉛(Pb30+)、酸化ニッケル(Ni O)
及び酸化コバルト(Co O)等を使用することができ
、遮光性金属膜としてゲルマニウムの他にシリコン<S
i>、アンチモン(Sb )及び金(AU)を使用する
ことができ、反射防止膜として二酸化シリコンの他に酸
化ゲルマニウム(Ge 02 )及び酸化アンチモン(
S bzO>)等を使用することができ、塩素系ガスと
してCCQ+の他にCl2z、BCQ3、CH2OCQ
s等及びそれらの混合ガス又は前記塩素系ガスに酸素ガ
スを混合したものを使用することができる。更に、以上
の透明導電膜と反射防止膜は、所定の膜厚をもって1層
で形成されるが、列挙された各酸化物を多層形成しても
にい。
In addition, as another example, in addition to indium oxide, iron oxide (Fe304), rhenium oxide (Rez07), 11f lead oxide (P bsOJ
, zinc oxide (Pb30+), nickel oxide (NiO)
and cobalt oxide (CoO), etc. In addition to germanium, silicon<S
i>, antimony (Sb) and gold (AU) can be used, and in addition to silicon dioxide, germanium oxide (Ge 02 ) and antimony oxide (
In addition to CCQ+, Cl2z, BCQ3, CH2OCQ can be used as chlorine gas.
s, a mixed gas thereof, or a mixture of the chlorine-based gas and oxygen gas can be used. Furthermore, although the transparent conductive film and the antireflection film described above are formed as a single layer with a predetermined thickness, it is also possible to form multiple layers of each of the listed oxides.

以上の通り、本発明によれば、塩素系ガスによるプラズ
マエツチング用のフォトマスクブランクを実現したこと
により、その実用的な価値は多大である。
As described above, according to the present invention, a photomask blank for plasma etching using chlorine-based gas has been realized, which has great practical value.

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

第1図は本発明による実施例を示すフォトマスクブラン
クの概略断面図、第2図は前実施例のフォトマスクブラ
ンクを使用した塩素系ガスによるプラズマエツチングに
よって製作したフォトマスクの概略断面図である。
FIG. 1 is a schematic sectional view of a photomask blank showing an embodiment according to the present invention, and FIG. 2 is a schematic sectional view of a photomask manufactured by plasma etching with chlorine gas using the photomask blank of the previous embodiment. .

Claims (1)

【特許請求の範囲】 く1) 塩素系ガスを用いたプラズマエツチング用のフ
ォトマスクブランクにおいて、ガラス基板上にシリコン
、ゲルマニウム、アンチモン及び金のうら何れか1つを
遮光性金属膜として成膜し、かつ前記遮光性金属膜上に
シリコン、ゲルマニウム及びアンチモンの各酸化物のう
ち少くとも1層を反射防止膜として成膜したことを特徴
とするフォトマスクブランク。 (2) 塩素系ガスを用いたプラズマエツチング用のフ
ォトマスクブランクにおいて、ガラス基板上に鉄、イン
ジウム、レニウム、鉛、亜鉛、ニッケル及びコバルトの
各酸化物のうち少くとも1層を透明導電膜として成膜し
、かつ前記透明導電股上にシリコン、ゲルマニウム、ア
ンチモン及び金のうち何れか1つを遮光性金属膜として
成膜したことを特徴とするフォトマスクブランク。 (3) 塩素系ガスを用いたプラズマエツチング用のフ
ォトマスクブランクにおいて、ガラス基板上に鉄、イン
ジウム、レニウム、鉛、亜鉛、ニッケル及びコバルトの
各酸化物のうち少くとも1層を透明導電膜として成膜し
、かつ前記透明導電H養土にシリコン、ゲルマニウム、
アンチモン及び金のうち何れか1つを遮光性金属膜とし
て成膜し、かつ前記遮光性金属膜上にシリコン、ゲルマ
ニウム及びアンチモンの各酸化物のうち少くとも1層を
反射防止膜として成膜したことを特徴とするフォトマス
クブランク。
[Claims] H1) In a photomask blank for plasma etching using chlorine gas, one of silicon, germanium, antimony, and gold is formed as a light-shielding metal film on a glass substrate. and at least one layer of silicon, germanium, and antimony oxides is formed as an antireflection film on the light-shielding metal film. (2) In a photomask blank for plasma etching using chlorine-based gas, at least one layer of oxides of iron, indium, rhenium, lead, zinc, nickel, and cobalt is formed as a transparent conductive film on a glass substrate. A photomask blank characterized in that a film is formed on the transparent conductive crotch, and one of silicon, germanium, antimony, and gold is formed as a light-shielding metal film. (3) In a photomask blank for plasma etching using chlorine-based gas, at least one layer of oxides of iron, indium, rhenium, lead, zinc, nickel, and cobalt is formed as a transparent conductive film on a glass substrate. Silicon, germanium,
Either one of antimony and gold was formed as a light-shielding metal film, and at least one layer of silicon, germanium, and antimony oxide was formed on the light-shielding metal film as an antireflection film. A photomask blank characterized by:
JP58012904A 1983-01-31 1983-01-31 Photomask blank Granted JPS59139033A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58012904A JPS59139033A (en) 1983-01-31 1983-01-31 Photomask blank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58012904A JPS59139033A (en) 1983-01-31 1983-01-31 Photomask blank

Publications (2)

Publication Number Publication Date
JPS59139033A true JPS59139033A (en) 1984-08-09
JPS6237382B2 JPS6237382B2 (en) 1987-08-12

Family

ID=11818349

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58012904A Granted JPS59139033A (en) 1983-01-31 1983-01-31 Photomask blank

Country Status (1)

Country Link
JP (1) JPS59139033A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60132323A (en) * 1983-12-21 1985-07-15 Hitachi Ltd Mask for x-ray exposure
WO2006027928A1 (en) * 2004-09-10 2006-03-16 Shin-Etsu Chemical Co., Ltd. Photomask blank, photomask and method for producing those
JP2016009744A (en) * 2014-06-24 2016-01-18 凸版印刷株式会社 Reflective mask and reflective mask blank
EP3214496A1 (en) 2016-03-02 2017-09-06 Shin-Etsu Chemical Co., Ltd. Photomask blank and method for preparing a photomask
KR20170102811A (en) 2016-03-02 2017-09-12 신에쓰 가가꾸 고교 가부시끼가이샤 Photomask blank and method for preparing photomask

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60132323A (en) * 1983-12-21 1985-07-15 Hitachi Ltd Mask for x-ray exposure
WO2006027928A1 (en) * 2004-09-10 2006-03-16 Shin-Etsu Chemical Co., Ltd. Photomask blank, photomask and method for producing those
US7618753B2 (en) 2004-09-10 2009-11-17 Shin-Etsu Chemical Co., Ltd. Photomask blank, photomask and method for producing those
JP2016009744A (en) * 2014-06-24 2016-01-18 凸版印刷株式会社 Reflective mask and reflective mask blank
EP3214496A1 (en) 2016-03-02 2017-09-06 Shin-Etsu Chemical Co., Ltd. Photomask blank and method for preparing a photomask
KR20170102811A (en) 2016-03-02 2017-09-12 신에쓰 가가꾸 고교 가부시끼가이샤 Photomask blank and method for preparing photomask
US10678125B2 (en) 2016-03-02 2020-06-09 Shin-Etsu Chemical Co., Ltd. Photomask blank and method for preparing photomask
US11327393B2 (en) 2016-03-02 2022-05-10 Shin-Etsu Chemical Co., Ltd. Photomask blank and method for preparing photomask

Also Published As

Publication number Publication date
JPS6237382B2 (en) 1987-08-12

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