Lu Wan1, Cuili Zhang1, Kunpeng Ge1, Xueliang Yang1, Feng Li2, Wensheng Yan1, Zhuo Xu2, Lin Yang1, Ying Xu1, Dengyuan Song2, and Jianhui Chen1,*
1 Hebei Key Lab of Optic‐Electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding, 071002 China
2 State Key Laboratory of Photovoltaic Materials & Technology, Yingli Green Energy Holding Co., Ltd., Baoding, 071051 China