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    • 2. 发明授权
    • Avoidance of pattern shortening by using off axis illumination with
dipole and polarizing apertures
    • 通过使用偶极和偏光孔的离轴照明来避免图案缩短
    • US5815247A
    • 1998-09-29
    • US531767
    • 1995-09-21
    • Bernhard PoschenriederTakashi SatoTsukasa Azuma
    • Bernhard PoschenriederTakashi SatoTsukasa Azuma
    • G03F7/20H01L21/027G03B27/42G03B27/54G03B27/72
    • G03F7/70558G03F7/2022G03F7/701G03F7/70566
    • A system and method of avoiding pattern shortening without resorting to generating a mask with a bias solve the direction dependent differences in exposure behavior in photolithography processes in the manufacture of semiconductor devices. Instead of designing a biased mask to solve the exposure problem, the pattern shortening effect is avoided by influencing the exposure process itself. By using an off axis illumination technique, the exposure is separated into different directions. In one embodiment, off axis illumination is applied in combination with special dipole apertures (i.e., two openings). The exposure is done in two or more parts, whereby the aperture is twisted between exposures. In another embodiment, off axis illumination is used in combination with special polarizer apertures. As with the first embodiment, the exposure is done in two or more parts, but in this case with differently polarized light.
    • 避免图案缩短的系统和方法,而不用借助于产生具有偏置的掩模来解决半导体器件的制造中光刻工艺中的曝光行为的方向相关差异。 不是设计偏置掩模来解决曝光问题,而是通过影响曝光过程本身来避免图案缩短效果。 通过使用离轴照明技术,将曝光分离成不同的方向。 在一个实施例中,离轴照明与特殊偶极子孔(即两个开口)组合施加。 曝光是在两个或更多部分进行的,由此孔径在曝光之间扭转。 在另一个实施例中,离轴照明与特殊的偏振器孔组合使用。 与第一实施例一样,曝光在两个或更多个部分中进行,但是在这种情况下以不同的偏振光进行曝光。