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    • 5. 发明授权
    • Half-tone phase shift mask having a stepped aperture
    • 具有阶梯孔的半色调相移掩模
    • US06531250B2
    • 2003-03-11
    • US09759161
    • 2001-01-16
    • Hyoung-joon Kim
    • Hyoung-joon Kim
    • G03F900
    • G03F1/32
    • A half-tone phase shift mask includes a transparent substrate, a phase shift pattern formed on the semiconductor substrate and having a stepped aperture which exposes the transparent substrate by a predetermined width, and an opaque film pattern formed on the upper surface of the phase shift pattern. The stepped aperture is defined by an interior side wall of the phase shift pattern. This side wall includes a horizontal surface which is parallel to the surface defining the bottom of the aperture. Light transmitted by the mask via the surface defining the bottom of the aperture has a phase difference of 180 degrees with respect to light transmitted by the mask via the horizontal surface, and light transmitted by the mask via the surface defining the bottom of the aperture has a phase difference of more than 180 degrees with respect to light transmitted by the mask via the upper surface of the phase shift pattern. Accordingly, the half-tone phase shift mask includes a first transmissive region for blocking light, a second transmissive region that sets the width of a pattern to be formed on photosensitive film, a third transmissive region for causing light transmitted thereby to be out of phase by 180 degrees with respect to the light transmitted by the second transmissive region, and a fourth transmissive region having a width greater than the width of the third transmissive region for causing light transmitted thereby to be out of phase by more than 180 degrees with respect to light transmitted by the second transmissive region.
    • 半色调相移掩模包括透明衬底,形成在半导体衬底上并具有使透明衬底暴露预定宽度的阶梯孔的相移图案,以及形成在相移上表面上的不透明膜图案 模式。 阶梯孔由相移图案的内侧壁限定。 该侧壁包括平行于限定孔的底部的表面的水平表面。 由掩模经由限定孔的底部的表面透射的光相对于由掩模经由水平表面透射的光具有180度的相位差,并且由掩模经由限定孔的底部的表面透射的光具有 相对于由掩模经由相移图案的上表面透射的光大于180度的相位差。 因此,半色调相移掩模包括用于阻挡光的第一透射区域,设置要在感光膜上形成的图案的宽度的第二透射区域,用于使由其透射的光不相位的第三透射区域 相对于由第二透射区域透射的光180度;以及第四透射区域,其宽度大于第三透射区域的宽度,用于使透过的光相对于相对于 由第二透射区域透射的光。