Symposium IV. Invited Speaker Dr. Zhigang Rick Li, Researcher, DuPont, USA Zhigang Rick Li is a researcher at DuPont Central Research and Development, Wilmington, Delaware, USA. The author or co-author of more than 80 professional publications and a book chapter, editor/co-editor of two books in material science. The recipient of the Sina-France Abroad Study Award. He received the B.S. Degree in Optics from the Beijing Institute of Technology, China, and the Ph.D degree in Physics from the Laboratory d’Optique Electronique du C.N.R.S., Toulouse, France. Since joining the DuPont Company, he has worked on many industrial important projects, especially front-side Ag paste for crystalline Si solar cells. He and his colleagues published a number of papers and gave several presentations at IEEE PVSC and EU-PVSEC meetings concerning new current conduction mechanism of “Nano-Ag Colloids Assisted Tunneling” in recent years.