Author Affiliations

Z. Z. Dong,¹ H. P. Li,^1,* H. D. Xia,¹ Y. Liu,¹ Z. G. Wang,² and Y. F. Chen²

¹School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China

²State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China

^*Corresponding author: oehpli@uestc.edu.cn