Dr Ying Zhao is the Professor in Nankai University. He is now the vice president of China Renewable Energy Society and the director of Solar PV Committee of China Renewable Energy Society. He is also the dean of the College of Electronic Information and Optical Engineering in Nankai University. Since 1992, he engaged in the study of thin film optoelectronic materials and devices. Now he has published over 100 papers and authorized by more than 20 patents.