1. Department of Materials Science and Engineering, National University of Singapore, Singapore, 117574, Singapore; 2. Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, Guangdong, China; 3. Industrial Research Institute of Nonwovens and Technical Textiles, College of Textiles and Clothing, Qingdao University, Qingdao, 266071, Shandong, China
Authors acknowledge the support of the Green Energy Programme (R284-000-185-731) supported by the National University of Singapore, and the Tier 1 Grant (R284-000-193-114), supported by MOE for research conducted at the National University of Singapore.
