Open AccessPerformance of CdTe solar cells with different back electrodes and back contact layers
Author(s) -
Huijin Song,
Jun Zheng,
Liang Feng,
Cai Wei,
Yuanqiang Cai,
Jingquan Zhang,
Wei Li,
Bing Li,
Wu Li-Li,
Lei Zhi,
Qiang Ye
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.1655
Subject(s) - cadmium telluride photovoltaics , materials science , electrode , layer (electronics) , x ray photoelectron spectroscopy , diffusion , ion , optoelectronics , chemical engineering , analytical chemistry (journal) , nanotechnology , chemistry , physics , organic chemistry , chromatography , engineering , thermodynamics
In this paper, the effects of Ni and Au back electrode on the performance of CdTe solar cells and the mechanisms have been studied by experiment. Among the back electrodes of Ni, Ni/Au, Au/Ni and Au film, only when the Ni film contacts the ZnTe/ZnTe:Cu complex layers, does the conversion efficiency increase with the short current increasing. So it is probable that the conversion efficiencies of cells will be increased by 4% at least, and the cost in large scale manufacturing will be cut down. By analyzing the dark C-V/I-V cures and the XPS using different back electrode films, it has been found the concentration and depth of Ni diffusion in the ZnTe/ZnTe:Cu back contact layer are greater than that of Au. What's more, most Nix+ combine with the abundant Te ions in ZnTe/ZnTe:Cu back contact layer to form the NixTe. So the diffusion concentration is increased, which makes the characters of CdTe improved.