1. Corporate R&D Center, Samsung SDI, Co. LTD, Gongse-dong, Yongin, Gyunggi 446-577, Republic of Korea
2. School of Display and Chemical Engineering, Yeungnam University, 214-1, Dae-dong, Gyeongsan, Gyeongbuk 712-749, Republic of Korea
3. Solar Cell Research Center, Korea Institute of Science and Technology (KIST), Seoul 136-791, Republic of Korea