1. Department of Applied Biology and Chemical Technology, Research Institute for Smart Energy, Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China
2. The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, P. R. China