. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China.. Department of Electrical and Electronic Engineering, School of Mathematics, Computer Science and Engineering, City, University of London, London, EC1V 0HB, UK.. Department of Materials, University of Oxford, Oxford, OX1 3PH, UK.. MatSurf Technology Ltd., The Old Stables Marion Lodge, Cumbria, CA10 1NW, UK.. School of Energy Resources, University of Wyoming, Laramie, WY 82071, USA.. School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China