Hong Kong Polytechnic University - Research Institute for Smart Energy (RISE), Hong Kong Polytechnic University - Research Institute for Smart Energy (RISE), Hong Kong Polytechnic University - Department of Applied Physics, Hong Kong Polytechnic University - Research Institute for Smart Energy (RISE), Hong Kong Polytechnic University - Research Institute for Smart Energy (RISE), University of North Carolina (UNC) at Chapel Hill - Department of Applied Physical Science, The Chinese University of Hong Kong - Department of Physics, Hong Kong Polytechnic University - Research Institute for Smart Energy (RISE), Hong Kong Polytechnic University - Research Institute for Smart Energy (RISE), Hong Kong Polytechnic University - Research Institute for Smart Energy (RISE), City University of Hong Kong - Center of Super-Diamond and Advanced Films (COSDAF), Hong Kong Polytechnic University - Department of Applied Physics, Hong Kong Polytechnic University - Laboratory for Advanced Interfacial Materials and Devices, Hong Kong Polytechnic University - Research Institute for Smart Energy (RISE), Hong Kong Polytechnic University - Department of Applied Physics, Hong Kong Polytechnic University - Department of Applied Physics, City University of Hong Kong - Center of Super-Diamond and Advanced Films (COSDAF), Chinese University of Hong Kong - Department of Physics, Hong Kong Polytechnic University - Institute of Textiles and Clothing, University of North Carolina (UNC) at Chapel Hill - Department of Applied Physical Science and Hong Kong Polytechnic University - Research Institute for Smart Energy (RISE)