1. Engineering Research Center for Functional Ceramics of the Ministry of Education School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074, PR China
2. Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074, PR China
3. Environment and Sustainability Institute University of Exeter Penryn TR10 9FE Cornwall United Kingdom
4. Department of Physics Swansea University Vivian Tower, Singleton Park SA2 8PP Swansea United Kingdom.
5. Solar Energy Research Institute (SERI) Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia
6. Institute of Chemical Sciences and Engineering École Polytechnique Fédérale de Lausanne (EPFL) Rue de l'Industrie 17 CH-1951 Sion Switzerland