1. Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road Hong Kong 999077 China
2. State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 China
3. Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization The University of Toledo Toledo OH 43606 USA
4. Guangdong‐Hong Kong‐Macao Joint Laboratory for Photonic‐Thermal‐Electrical Energy Materials and Devices Shenzhen 518055 China
5. Department of Chemistry The University of Hong Kong Pokfulam Road Hong Kong 999077 China