1. School of Photovoltaic and Renewable Energy Engineering, Australian Centre for Advanced Photovoltaics; University of New South Wales; Sydney 2052 Australia
2. Research Center for Photovoltaics (RCPV); National Institute of Advanced Industrial Science and Technology (AIST); Central 2, Umezono 1-1-1, Tsukuba Ibaraki 305-8568 Japan
3. Directorate C-Energy, Transport and Climate, European Commission-Joint Research Centre; Via E. Fermi 2749, IT-21027 Ispra (VA) Italy
4. National Renewable Energy Laboratory; 15013 Denver West Parkway Golden CO 80401 USA
5. Department of Characterisation and Simulation/CalLab Cells; Fraunhofer-Institute for Solar Energy Systems; Heidenhofstr. 2 D-79110 Freiburg Germany