1. Key
Laboratory of Novel Thin Film Solar Cells, Institute of Applied Technology,
Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, P. R. China
2. University of Science and Technology of China, Hefei, 230026, P. R. China
3. Beijing
Key Laboratory of Novel Thin Film Solar Cells, North China Electric Power University, Beijing, 102206, P. R. China