1. Institute of Applied TechnologyHefei Institutes of Physical Science; Chinese Academy of Sciences; Hefei 230088 P. R. China
2. CAS Key Laboratory of Photovoltaic and Energy Conservation Materials; Chinese Academy of Sciences; Hefei 230031 P. R. China
3. Department of Engineering; Graduate School of Integrated Science and Technology; Shizuoka University; 3-5-1, Johoku, Naka-ku Hamamatsu 432-8561 Japan
4. School of Environment and Chemical Engineering; North China Electric Power University; Beijing 102206 P. R. China
5. Graduate School of Science and Technology; Shizuoka University; 3-5-1 Johoku, Naka-ku Hamamatsu 432-8561 Japan
6. Research Institute of Electronics; Shizuoka University; 3-5-1 Johoku, Naka-ku Hamamatsu 432-8561 Japan