1. Faculty of Information Technology; Macau University of Science and Technology; Macao 519020 P. R. China
2. Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics; Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province; College of Optoelectronic Engineering; Shenzhen University; Shenzhen 518060 China
3. Department of Nanoscience and Technology; Bharathiar University; Coimbatore Tamil Nadu 641046 India