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CCD多晶硅刻蚀技术研究

Pengfei XIANG,Anbo YUAN,Xiuwei YANG,Jianwei GAO

Semiconductor Optoelectronics（2010）

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Abstract
CCD晶硅刻蚀相比于传统CMOS工艺的多晶硅刻蚀需要多晶硅对氮化硅更高的刻蚀选择比,更长的过刻蚀时间.采用Cl2+He,Cl2+He+O2,Cl2+He+O2+HBr三种工艺气体组分在Lam4420机台进行了多晶硅刻蚀实验,研究了不同气体配比、不同射频功率对刻蚀速率、选择比、条宽、侧壁形貌等参数的影响.通过优化工艺参数,比较刻蚀结果,最终获得了适合于CCD多层多晶硅刻蚀的工艺条件.
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Key words
CCD,Etch,Poly,Selectivity
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