摘要
由于得到HgCdTe扩散长度Lp的标准测试结构会损伤p-n结单元,实验中广泛采用激光束诱导电流(LBIC)提取的等效扩散长度L来代替Lp.本文通过二维数值模拟,分析了等效扩散长度L和扩散长度Lp的关系.二者的比例关系为L/Lp=1.1,该基本关系不受器件的关键参数如掺杂浓度、载流子寿命、载流子迁移率等的影响.最后将激光束诱导电流实验所获得的等效扩散长度L进行除1.1因子的修正,给出了实际HgCdTe光伏器件中的电子扩散长度.
The standard diffusion length (L_p) test procedure is apt to damage the p-n junction, so we often use characteristic decay length (L) obtained by laser beam induced current (LBIC) instead of L_p. Two dimensional modeling is used to get the relations of L and L_p. Calculated L/L_p ratio is about 1.1, and it is not affected by doping concentration, Shockley-Read-Hall (SRH) lifetime and mobility. For HgCdTe photodiodes, we get characteristic decay length from the LBIC experiment, and get the true diffusion length by division by the ratio 1.1.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第11期7884-7890,共7页
Acta Physica Sinica
基金
国家自然科学基金(批准号:10734090
10725418)
上海-应用材料研究与发展基金(批准号:08520740600)
航空科学基金(批准号:20080190001)资助的课题~~
关键词
碲镉汞
激光束诱导电流
扩散长度
HgCdTe
laser beam induced current (LBIC)
diffusion length