摘要
表面光电压法(SPV)能精确测量硅片的Fe离子浓度,是一种快速、非破坏性的高灵敏度测试方法。采用表面光电压技术研究了氧化工艺中的Fe离子沾污。研究表明,氧气、氮气、三氯乙烯中含有的微量杂质是氧化工艺中Fe离子沾污的主要来源。通过对氧气、氮气进行进一步纯化处理、减少三氯乙烯杂质质量分数到1.0×10-8、更换传输气体的不锈钢管路等措施,将氧化工艺Fe离子沾污减少了一个数量级。
The Fe content in the silicon wafer can be accurately determined by surface photovoltage (SPV) technique which is a rapid and nondestructive measure with high sensitivity. In this study, the Fe contamination in the oxide process was investigated by means of SPV technique. The results show that trace impurity contained in the oxygen, nitrogen and trichloroethylene mainly lead to the Fe contamination in the oxidation process. Through purifying oxygen and nitrogen, reducing the content of trace metal in the trichloroethylene from 1.0 × 10-7 to 1.0×10-8 and renewing the stainless steel pipeline for transmitting oxygen and nitrogen, the Fe contamination in oxidation process is reduced by one order of magnitude.
出处
《半导体光电》
CAS
CSCD
北大核心
2013年第4期600-602,606,共4页
Semiconductor Optoelectronics
关键词
电荷耦合器件
氧化工艺
Fe离子沾污
表面光电压
charge-coupled device
oxide process
Fe iron contamination
surfacephotovoltage