1. Solar Energy Research Institute of Singapore, National University of Singapore, Singapore 117574, Singapore
2. NUS Graduate School for Integrative Science and Engineering, National University of Singapore, Singapore 117456, Singapore
3. Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstrasse 2, D-79110 Freiburg, Germany
4. The School of Photovoltaic and Renewable Energy Engineering, The University of New South Wales, Sydney NSW 2052, Australia
5. Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117456, Singapore