1. Key Laboratory
of Novel Thin-Film Solar Cells, Institute of Applied Technology, Hefei
Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, P. R. China
2. Institute of Materials Physical Chemistry, Huaqiao University, Quanzhou 362021, P. R. China
3. Beijing Key Laboratory of Novel Thin-Film Solar Cells, North China Electric Power University, Beijing 102206, P. R. China