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    • 5. 发明授权
    • Photomask and method of manufacturing the same
    • 光掩模及其制造方法
    • US07563547B2
    • 2009-07-21
    • US10982851
    • 2004-11-08
    • Jin-hyung ParkSung-min Huh
    • Jin-hyung ParkSung-min Huh
    • G03F1/08G03F1/14
    • G03F1/36
    • A photomask ensures the transfer of a pattern having a uniform and desired CD onto a substrate from which an electronic device or the like is made. The photomask includes a transparent substrate, a light-shielding film on the front side of the substrate and defining a mask pattern of transmission regions dedicated for pattern formation, and an auxiliary pattern on the front side of the substrate that alters the intensity of the light beam passing through the substrate. After the mask pattern is formed, the photomask is tested to determine variations between the desired (target) CD and the CDs of the features of a pattern transcribed onto a test wafer using the photomask. A density function in which characteristics of the auxiliary pattern to be formed, e.g., the size, depth and/or pitch of recesses, is developed as a prediction of the intensity distribution of the light beam transmitted through the substrate once the auxiliary pattern is present at the front side of the substrate. The photomask is then repaired/corrected by designing and forming the auxiliary pattern according to the density function so as to prevent local or global variations between the desired CD and the actual CD from occurring.
    • 光掩模确保将具有均匀且期望的CD的图案转移到制造电子设备等的基板上。 光掩模包括透明基板,在基板的正面上的遮光膜,并且限定专用于图案形成的透射区域的掩模图案,以及在基板的正面上改变光强度的辅助图案 光束通过基板。 在形成掩模图案之后,测试光掩模以确定期望(目标)CD和使用光掩模转录到测试晶片上的图案的特征的CD之间的变化。 要形成的辅助图案的特性(例如凹槽的尺寸,深度和/或间距)的密度函数被形成为一旦辅助图案存在就作为透射通过基底的光束的强度分布的预测 在基板的正面。 然后通过根据密度函数设计和形成辅助图案来修复/校正光掩模,以便防止所需CD和实际CD之间发生局部或全局变化。