a
Department of Materials Science and Engineering, KAIST, Daejeon 305-701, South Korea
b
Photonics Technology Research Institute, Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-Dong, Puk-Gu, Gwangju 500-757, South Korea
c
Solar city center, Development of Advanced Components & Materials, Korea Institute of Industrial Technology, Gwangju, 500-480, South Korea
d
Photovoltaic Research Group, Korea Institute of Energy Research, 71-2 Jang-Dong Yuseong-Gu, Daejeon 305-343, South Korea
e
Department of Physics, Shivaji University, Kolhapur 416-004, India
f
Photonics Technology Research Institute, Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-Dong, Buk-Gu, Gwangju 500-757, South Korea
E-mail:
jinhyeok@chonnam.ac.kr
Fax: +82-62-530-1699
Tel: +82-62-530-1709
g
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, South Korea
E-mail:
j.y.lee@kaist.ac.kr
Fax: +82-42-350-3310
Tel: +82-42-350-4216