1. Key Laboratory for Thin Film and Micro‐Fabrication Technology of the Ministry of Education School of Electronics Information and Electrical Engineeringand Photovoltaic Research Center Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
2. Institute of Electronic Engineering National Tsing Hua University Hsinchu 300 Taiwan ROC
3. School of Physics Science and Technology Lingnan Normal University Zhanjiang 534048 China
4. Department of Materials and Optoelectronic Science National Sun Yat‐Sen University No.70 Lien‐Hai Rd Kaohsiung 80424 Taiwan ROC