Yi-Zhou Zhang,a Yang Wang,a Tao Cheng,a Lan-Qian Yao,a Xiangchun Li,a Wen-Yong Lai*ab and Wei Huangab
a Key Laboratory for Organic Electronics and Information Displays, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
b Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an 710072, China