1. Materials and Chemical Laboratories, Industrial Technology Research Institute, 195, Sec. 4, Chung Hsing Road, Chutung, Hsinchu, 310, Taiwan
2. Department of Chemical Engineering, National Tsing Hua University, Hsin-Chu 30013, Taiwan
3. Advance Technology Project Division, DelSolar Corporation, 2 R&D second Road, Science-Based Industrial Park, HsinChu 30076, Taiwan