1. School of Physics The University of Sydney Sydney NSW 2006 Australia
2. The University of Sydney Nano Institute (Sydney Nano) The University of Sydney Sydney NSW 2006 Australia
3. IEK‐5 Photovoltaics Forschungszentrum Jülich GmbH 52428 Jülich Germany
4. Department of Material Science and Engineering Southern University of Science and Technology Shenzhen Guangdong 518055 P. R. China
5. Department of Chemistry Southern University of Science and Technology Shenzhen Guangdong 518055 P. R. China
6. Australian Centre for Advanced Photovoltaics (ACAP) School of Photovoltaic and Renewable Energy Engineering University of New South Wales Sydney NSW 2052 Australia
7. Faculty of Electrical Engineering University of Ljubljana Tržaška 25 Ljubljana 1000 Slovenia
8. ARC Centre of Excellence in Excitation Science School of Physics University of New South Wales Sydney NSW 2052 Australia