1. KAUST Solar Center (KSC); Physical Sciences and Engineering Division (PSE); Material Science and Engineering Program (MSE); King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Kingdom of Saudi Arabia
2. Department of Physics; Imperial College London; South Kensington London SW7 2AZ UK
3. Department of Chemistry; SRM University-AP; Amaravati 522502 India