[Study on the back contact performances of cdte solar cells by XPS].
The metal materials with high work function should be used as the back electrode of CdTe solar cells. In the present paper, the back contact performances of CdTe solar cells with Au film and Ni film, respectively, were studied by X-ray photoelectron spectrum (XPS). After exfoliating the back electrode film, it was found that Au on the surface of ZnTe/ZnTe:Cu complex back contact layer is in the form of Au atoms and the concentration and depth of Ni diffusing into the ZnTe/ZnTe:Cu back contact layer are higher than that of Au. What's more, some Ni changes into Ni(x)+ ion which leads to rich Te ions in ZnTe/ZnTe:Cu back contact layer. So the diffusing concentration is increased, which makes the characters of CdTe improved. In the samples, the displacement of either Te or Zn peak position changes little, which indicates that both Te and Zn do not change in the modality.
Song
Hui-jin
HJ
College of the Materials Science & Engineering, Sichuan University, Chengdu 610064, China. shj1437@163.com
Zheng
Jia-gui
JG
Feng
Liang-huan
LH
Zhang
Jing-quan
JQ
Li
Wei
W
Li
Bing
B
Wu
Li-li
LL
Lei
Zhi
Z
Yan
Qiang
Q