Junjie Zhao1,2, Xiuxia Xu1,2, Kai Ren1, Zhou Luo1, Xvsheng Qiao1,*, Jincheng Du2,*, Jianbei Qiu3, Xianping Fan1, Guodong Qian1
1 State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027 China
2 Department of Materials Science and Engineering, University of North Texas, Denton, TX, 76203 USA
3 School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093 China