1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources; School of Renewable Energy; North China Electric Power University; Beijing 102206 China
2. Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education; Department of Chemistry; Tsinghua University; Beijing 100084 China
3. Key Laboratory of Solar Thermal Energy and Photovoltaic System; Institute of Electrical Engineering; Chinese Academy of Sciences; Beijing 100190 China
4. Electronic and Magnetic Materials Department; Central Metallurgical Research and Development Institute (CMRDI); PO Box 87 Helwan, 1, Elfelezat Street El-Tebbin 11421 Cairo Egypt
5. Hunan Key Laboratory of Super-microstructure and Ultrafast Process; School of Physics and Electronics; Central South University; Hunan 410083 P. R. China