Affiliation: | 1. Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 500-757, Republic of Korea;2. Department of Semiconductor Science and Technology, Basic Research Laboratory (BRL), Semiconductor Physics Research Center (SPRC), Chonbuk National University, Jeonju 561–756, Republic of Korea;3. Department of Applied Chemistry, Institute of Technology, Banaras Hindu University, Varanasi 221005, UP, India |