摘要
采用等离子体化学气相沉积(PECVD)法,以高纯度硅烷(SiH4)为反应气体,硼烷(B2H6)为掺杂气体,在ITO玻璃衬底上制备出硼轻掺杂浓度的氢化非晶硅(a-Si∶H)半导体薄膜。测量了样品的光暗电导率、折射率、消光系数、禁带宽度随掺杂浓度的变化。结果表明:随着硼掺杂浓度的增加,薄膜的暗电导率先减小后增大。消光系数、禁带宽度等都随着掺杂浓度的增加而变化。在不同工艺条件下,改变硼掺杂浓度,确定了最佳掺杂比(光暗电导率之比最大),制备出适合器件级轻掺杂氢化非晶硅薄膜光敏层。
Boron-doped a-Si∶ H thin films were fabricated by the Plasma Enhanced Chemical Vapor Deposition(PECVD)method on ITO glass substrate,with high purity silane(SiH4)as the reaction gas and borane(B2H6)as the dopant gas.The influence of boron-doping amount on conductivity,refractive index,extinction coefficient and band gap were measured.The results show that with the increasing concentration of boron doping amount,the darkness of the films decreases first and then increases.Both the extinction coefficient and the band gap increase and then decreases as the increasing boron doping amount.Without changing the experimental conditions,the optimum doing ratio(the maximum ration of the brightness and darkness of the films)was determined,and then the lightly doped hydrogenated amorphous silicon thin films suitable for device-level photosensitive layer were successfully fabricated.
出处
《半导体光电》
CAS
CSCD
北大核心
2014年第4期650-653,共4页
Semiconductor Optoelectronics
基金
国家自然科学基金项目(51372032)
关键词
PECVD
氢化非晶硅
硼掺杂
电导率
折射率
PECVD
hydrogenated amorphous silicon thin film
doped boron
conductivity
refractive index