JPS6326653A - フオトレジスト材 - Google Patents

フオトレジスト材

Info

Publication number
JPS6326653A
JPS6326653A JP16983786A JP16983786A JPS6326653A JP S6326653 A JPS6326653 A JP S6326653A JP 16983786 A JP16983786 A JP 16983786A JP 16983786 A JP16983786 A JP 16983786A JP S6326653 A JPS6326653 A JP S6326653A
Authority
JP
Japan
Prior art keywords
polymer
resolution
photoresist material
sulfonic acid
ultraviolet rays
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
JP16983786A
Other languages
English (en)
Inventor
Tsugio Yamaoka
亜夫 山岡
Yoshitaka Tsutsumi
堤 義高
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.)
Tosoh Corp
Original Assignee
Tosoh 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 Tosoh Corp filed Critical Tosoh Corp
Priority to JP16983786A priority Critical patent/JPS6326653A/ja
Publication of JPS6326653A publication Critical patent/JPS6326653A/ja
Pending 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
    • G03F7/00Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004Photosensitive materials
    • G03F7/039Macromolecular compounds which are photodegradable, e.g. positive electron resists

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、フォトレジスト材に関し、更に詳しくは、近
紫外及び遠メ臀対して高感度、高解像性かつドライエツ
チング耐性に優れたフォトレジスト材に関する。
〔発明の背景〕
近年、半導体集積回路の高密度化、高集積化が進み、集
積度1Mビット以上の時代となり、1μmルールさらに
はそれ以下のパターン形成が必要になっている。それに
伴い、電子線、X線を用いたリソグラフィーとともに、
多層レジスト、0EL(Contrast Enhan
ced Lithography)、高解像度レジスト
等を使用した近紫外及び遠紫外のフォトリソグラフィー
技術の利用が試みられている。
その際に使用されるレジスト材の性能としては、使用さ
れる光源に対して高感度であること、・形成されたパタ
ーンの解像性が優れていること及び微細加工のためには
ドライプロセスが有利であることから、ドライエツチン
グ耐性を有していることが必要である。高解像性を満足
するには、ネガ型よりポジ型が有利であり、特に、水系
で現像できるのが好ましい。代表的なポジ型フォトレジ
スト材にノボラック樹脂とナフトキノンジアジド系感光
剤とからなるレジストがある。かかるレジスト材は1μ
m以上のパターン形成においては解像性は充分であるが
、微細パターンになると、膜減りのために解像性は充分
とはいえない。
また、特開48−47320に示されているポリアクリ
ル酸に0−ニトロベンジルアルコールをエステル化した
ポリマーは光照射によりアルカリ可溶性となるが、解像
度は高いが感度が低い。
〔発明の目的〕
本発明は以上の観点からなされたもので、その目的は微
細加工に用いる実用的なレジスト材として、近紫外、遠
紫外に対して感度及び解像度が高く、かつドライエツチ
ング耐性を有する材料を提供するところにある。
〔発明の構成〕
本発明者らは、高感度、高解像度、かつドライエツチン
グ耐性に優れたレジスト材を求めて鋭意検討した。その
結果、エステル部が〇−位にニトロ基を置換したベンジ
ルタイプであるスルホン酸エステルを含有する重合体が
優れた性能を有することを見出し本発明に至った。
すなわち、本発明は一般式(1) %式% (RIs R,;水素又は低級アルキル基で示される構
造単位を含む重合体からなることを特徴とするフォトレ
ジスト材に関する。低級アルキル基としては炭素数1〜
5のアルキル基が好ましく、例えば、メチル基、エチル
基等である。
本発明のレジスト材である上記一般式(1)で示される
構造単位を含む重合体は例えば以下の方法で製造できる
高分子反応の例としては、一般式(2)(RI;水素又
は低級アルキル基 で示される繰返し単位からなる重合体とアルコールとの
エステル化を水酸化カリウム等のアルカリ存在下で行う
方法がある。
また、一般式(3) (R,、R,;水素又は低級アルキル基で示されるα−
置換スチレンスルホン酸エステルを単独あるいは共重合
することにより、上記一般式+1)で示される構造単位
を含む重合体が得られる。
重合体は、通常のラジカル重合により得られ、塊状重合
、溶液重合、乳化重合の方法で行うことができる。
α−置換スチレンスルホン酸エステルは以下の方法で合
成できる。例えば、スチレンスルホン酸エステルの場合
(7I:は、スチレンスルホン酸ナトリウムをチオニル
クロライド、五塩化リン等の塩素化剤と反応させてスチ
レンスルホン酸クロライドを合成し、更に該化合物をO
−ニトロベンジルタイプのアルコールと塩基の存在下に
て反応させろことKより合成することができる。
本発明のレジスト材に含有されるα−置換スチレンスル
ホン酸エステルとtjm&’!、、スチレンスルホン酸
2−ニトロベンジルエステル、スチレンスルホン酸2−
ニトロ3−メチルベンジルエステル。
スチレンスルホン酸2−ニトロ5−メチルベンジルエス
テル、α−メチルスチレンスルホン酸2−二トロベンジ
ルエステル等が挙げられる。
本発明によるレジスト材は、分子量が数千から数百万の
範囲にあることが好ましい。分子量が数千未満であると
、形成された皮膜の機械的強度が劣ることがある。また
、数百万をこえるとレジスト材溶液の粘度が高くなりす
ぎ、膜厚の制御が困難となったり、取扱いにくくなった
りすることがある。
本発明によるレジスト材の塗布溶媒としてはポリマーを
溶解し、均一な皮膜を形成しうる溶媒であれば特に限定
されないが、例えば、キシレン。
トルエン、ベンゼン、テトラヒドロフラン、ジメチルホ
ルムアミド等を挙げろことができろ。
現像液としてはアルカリ現像液が使用でき、ポジパター
ンを与える。又、前記塗布溶媒等の有機溶媒系で現像を
行うと、ネガパターンを得ることができる。ただし、解
像性を重視すれば、アルカリ現像であるポジパターンの
方が好ましい。塗布。
プレベーク、露光、現像等のその他の手法は常法に従っ
て行えばよい。
〔発明の効果〕
本発明のレジスト材は、近紫外、遠紫外の照射によりス
ルホン酸エステルがスルホン酸となり、被照射部は未照
射部と比較して溶剤に対する溶解性が全く異なる。又、
膨潤が極めて少ない水系で現像できるため、高解像度罠
なるものと考えられる。
本発明のレジスト材が高感度であるのは、分子中に硫黄
、窒素原子を含んでいるために発現したものと推定され
る。
また、本発明のレジスト材は、ポリスチレン誘導体であ
るため、ドライエツチング耐性が優れている。
以上のことから、本発明のレジスト材は、半導体製造等
の微細パターン形成用レジスト材として有効である。
〔実施例〕
以下、合成例及び実施例により本発明を更に詳しく説明
するが、本発明はこれらに限定されるものではない。
合成例 スチレンスルホン20−ニトロベンジルエステルの合成 スチレンスルホニルフロラ()”2 [10g、 o 
−ニトロベンジルアルコール15.12及びベンゼン1
809を500−ナス型フラスコに仕込み、水冷下にて
、攪拌しながら、トリエチルアミンICLOiJを30
分間で滴下する。滴下後、20時間攪拌した後、沈殿物
を濾過により取り除いた。
戸液は、エバポレータにより、ベンゼンを蒸発除去した
。残存物は、ベンゼンを展開溶媒としてシリカケル力2
ムKかケ、スチレンスルホン酸〇−二トロペンジルエス
テル1a09を黄かっ色結晶として得た。該化合物が、
目的とするスチレンスルホン酸0−ニトロベンジルエス
テルである事は以下に示すスペクトルデータより明らか
である。
1)赤外吸収スペクトル(ヌジョール法)1520c1
n″″’ (c−Not伸!伸動振動360α−”(s
−o伸縮振動) 1340 cm−’ (C−No、伸縮振動)1170
crR−’  (S−0伸縮振動)赤外吸収スペクトル
を第1図に示す。
2)’H−NMR(溶媒CDC4) ■  5.48 ppm @   7.76 ppm ’H−NMRスペクトルを第2図に示す。
ポリスチレンスルホン酸0−ニトロベンジルエステルの
合成 スチレンスルホン醗0−ニトロベンジルエステル2.0
9.アゾビスイソブチロニトリルのベンゼン溶液2.9
m(アゾビスイソブチロニトリルを2、 Owt%含ム
)及びベンゼンα2−をフラスコにとり、常法に従い、
真空脱気した。該フラスコを70℃にて8時間攪拌した
。反応生成物はエチルエーテル中で精製し、濾過、乾燥
し、かっ色沈殿のホリスチレンスルホン酸O−ニトロベ
ンジルエステルをα4g得た。なお、重合体の重量平均
分子量は、G P C測定の結果、ポリスチレン換算で
tOXlいであった。
実施例 合成例で得られたポリスチレンスルホン酸〇−二トロベ
ンジルエステルcL3gをジメチルホルムアミド1.5
艷に溶解し、該溶液をシリコンウェハ上にスピンコード
法で塗布して、更に該ウェハを120℃の乾燥話中で3
0分間処理(プリベーク)した。こうしてシリコンウェ
ハ上に1.0μmのポリスチレンスルホン酸0−ニトロ
ベンジルエステル薄膜を形成させた。
次いで、PLA−501F(キャノン族)を用いて所望
部分KDeep UV光を露光した。その後、10 w
t%メタケイ酸ナトナトリウム水溶液像液として、露光
部分を溶解させ、ウェハ上にレジストパターンを形成し
た。感度は50 rnJ/aAで、1μmL&Sのポジ
パターンが形成できた。
ドライエツチング耐性は、ドライエツチング装置I)K
M−451型(日電アネルバ社製)を用いてCIF、ガ
スによる反応性スパッタリングに対する耐性を観察した
。ポリシリーン基板のエツチング速度が1400 A/
winなのに比べ、本発明重合体の場合は400 A 
/ m1nKなっている。このことより、ドライエツチ
ング耐性が優れていることは明らかである。
【図面の簡単な説明】
第1図及び第2図はスチレンスルホン酸〇−二トロペン
ジルエステルの赤外吸収スペクトル及び’FI−NMR
スペクトルを示す。 特許出願人  東洋曹達工業株式会社 透過纂 C9

Claims (1)

    【特許請求の範囲】
  1. (1)下記の一般式(1)で示される構造単位を含む重
    合体からなることを特徴とするフォトレジスト材。 ▲数式、化学式、表等があります▼(1) {R_1、R_2;水素又は低級アルキル基
JP16983786A 1986-07-21 1986-07-21 フオトレジスト材 Pending JPS6326653A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16983786A JPS6326653A (ja) 1986-07-21 1986-07-21 フオトレジスト材

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16983786A JPS6326653A (ja) 1986-07-21 1986-07-21 フオトレジスト材

Publications (1)

Publication Number Publication Date
JPS6326653A true JPS6326653A (ja) 1988-02-04

Family

ID=15893839

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16983786A Pending JPS6326653A (ja) 1986-07-21 1986-07-21 フオトレジスト材

Country Status (1)

Country Link
JP (1) JPS6326653A (ja)

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