1. Institute of Photoelectronic Thin Film Devices and Technology of Nankai University Tianjin Key Laboratory of Thin Film Devices and Technology Engineering Research Center of Thin Film Photoelectronic Technology Tianjin 300350 China
2. College of Physics Science and Technology Hebei University Baoding 071002 China
3. Australian Centre for Advanced Photovoltaics School of Photovoltaic and Renewable Energy Engineering University of New South Wales Sydney NSW 2052 Australia
4. Key Laboratory of Weak‐Light Nonlinear Photonics Ministry of Education School of Physics Nankai University Tianjin 300071 China
5. Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China