为简化大尺寸液晶面板四次光刻法的刻蚀工艺、减少有毒气体使用、降低射频功率消耗,在2 200 mm×2 500 mm大尺寸玻璃上,采用正交实验设计,验证了功率、气压、反应气体和比例等参数对各刻蚀步骤刻蚀速率、均一性和选择比的影响关系,从而得到各膜层的最佳工艺条件.在Enhance Cathode Couple Plasma Mode(ECCP)刻蚀模式下,采用新刻蚀条件合并薄膜晶体管有源区非晶硅、光刻胶、湿刻后源极和漏极剩余金属钼以及沟道非晶硅层干法刻蚀.利用扫描电子显微镜(SEM)对薄膜电学特性进行测试,结果显示,金属钼的刻蚀可以采用一次两步干法刻蚀,“2干2湿”刻蚀可以整合为“1干1湿”.整合后总刻蚀工艺时间减少16s,减少了氯气使用量和RF总功率.试验改进了均一性和刻蚀率,同时对于下底衬具有良好的选择比,保持了良好的形貌,为大批量“1干1湿”生产提供了依据.
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