发明授权
US5935765A Resist pattern forming method using anti-reflective layer with variable extinction coefficient 有权
使用具有可变消光系数的抗反射层的抗蚀图案形成方法

  • 专利标题: Resist pattern forming method using anti-reflective layer with variable extinction coefficient
  • 专利标题(中): 使用具有可变消光系数的抗反射层的抗蚀图案形成方法
  • 申请号: US159786
    申请日: 1998-09-24
  • 公开(公告)号: US5935765A
    公开(公告)日: 1999-08-10
  • 发明人: Toshihiko TanakaShoichi UchinoNaoko Asai
  • 申请人: Toshihiko TanakaShoichi UchinoNaoko Asai
  • 申请人地址: JPX Tokyo
  • 专利权人: Hitachi, Ltd.
  • 当前专利权人: Hitachi, Ltd.
  • 当前专利权人地址: JPX Tokyo
  • 优先权: JPX7-030425 19950220; JPX7-033313 19950222; JPX7-122150 19950522
  • 主分类号: G03F7/09
  • IPC分类号: G03F7/09 G03C1/825
Resist pattern forming method using anti-reflective layer with variable
extinction coefficient
摘要:
Disclosed are methods for forming a resist pattern which solve a problem (dimensional precision degradation) caused by halation and interference phenomena due to reflected light from the substrate, and which are fine and have high precision even with substrates having high reflectivity or substrates having a transparent film or substrates with an uneven surface. A first method forms between the substrate and resist film an anti-reflective film whose photoabsorbance of the exposure light is greater on the substrate surface side than on the resist surface side. A second method forms between the substrate and resist film a two-layer anti-reflective film made up of an upper-layer film which is an interference film for the exposure light and a lower-layer film which has higher exposure light absorbance than the upper-layer film and functions as a light shielding film. A third method forms between the substrate and resist film a two-layer anti-reflective film consisting of a lower-layer film that reflects the exposure light and an upper-layer film that is an interference film for the exposure light. A very high anti-reflection effect can be obtained without aspect ratio problems during the process of forming the anti-reflective film and without being influenced by the kind of substrate including those having a transparent film. With these methods, it is possible to form a fine and highly precise resist pattern. These methods can be used to form patterned resist films to etch object films, e.g., in forming microcircuits and/or gates (and word lines) of semiconductor devices.
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