1. Solar Cell Fabrication Laboratory Department of Electronics and Communication Engineering National Institute of Technology Silchar Silchar Assam 788010 India
2. Institute of Materials Research Slovak Academy of Sciences Watsonova 47 Kosice 04001 Slovakia
3. Institute of Microengineering and Nanoelectronics (IMEN) Universiti Kebangsaan Malaysia (UKM) Selangor 43600 Malaysia
4. Solar Energy Research Institute of Singapore National University of Singapore Singapor 117574 Singapore