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    • 10. 发明专利
    • Photolithographic led fabrication using phase-shift mask
    • 使用相位移屏蔽的照相机LED制造
    • JP2012133352A
    • 2012-07-12
    • JP2011265742
    • 2011-12-05
    • Ultratech Incウルトラテック インク
    • ANDREW M HAWRYLUKROBERT L HSIEHWARREN W FLACK
    • G03F7/20H01L33/22
    • H01L33/22G03F1/26G03F7/70283G03F7/703H01L33/007H01L2924/0002H01L2933/0083H01L2924/00
    • PROBLEM TO BE SOLVED: To provide a photolithographic method of forming a roughened surface for an LED to improve LED light emission efficiency.SOLUTION: The method includes photolithographically imaging a phase-shift mask pattern onto a photoresist layer of a substrate to form therein a periodic array of photoresist features. A roughened substrate surface is created by processing the exposed photoresist layer to form a periodic array of substrate posts in the substrate surface. A p-n junction multilayer structure is then formed atop the roughened substrate surface to form the LED. The periodic array of substrate posts serve as scatter sites that improve LED light emission efficiency as compared to the LED having no roughened substrate surface. The use of the phase-shift mask enables the use of affordable photolithographic imaging at a depth of focus suitable for non-flat LED substrates while also providing the needed resolution to form the substrate posts.
    • 要解决的问题:提供一种形成LED粗糙化表面以提高LED发光效率的光刻方法。 解决方案:该方法包括将相移掩模图案光刻成像到基板的光致抗蚀剂层上,以在其中形成光致抗蚀剂特征的周期性阵列。 通过处理暴露的光致抗蚀剂层以在衬底表面中形成周期性阵列的衬底柱而产生粗糙化的衬底表面。 然后在粗糙化的基板表面上形成p-n结多层结构以形成LED。 与没有粗糙化的衬底表面的LED相比,衬底柱的周期性阵列用作改善LED发光效率的散射点。 使用相移掩模使得可以在适合于非平坦LED基板的聚焦深度下使用经济的光刻成像,同时还提供形成基板柱的所需分辨率。 版权所有(C)2012,JPO&INPIT