Yongfang Li is a professor in the Institute of Chemistry, Chinese Academy of Sciences (ICCAS), since 1993. He obtained his Ph.D. degree in physical chemistry in 1986 from Fudan University and then came to ICCAS as a postdoctoral fellow working on conducting polymers with Prof. Renyuan Qian in 1986~1988. He did visiting research on organic semiconductors in Prof. Hiroo Inokuchi's laboratory in Institute for Molecular Science (IMS), Japan, from 1988 to 1991 and on electrochemistry of conducting polymers and polymer light-emitting electrochemical cells in Prof. Alan J. Heeger's laboratory in University of California at Santa Barbara (UCSB), USA, from 1997 to 1998. His present research interests are polymer solar cells and related photovoltaic materials.