1. Centre for Advanced Devices and Systems, Faculty of Engineering, Multimedia University, 63100, Cyberjaya, Selangor, Malaysia
2. Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, Universiti Malaya, 50603, Kuala Lumpur, Malaysia
3. Electronic and Communications Department, College of Engineering, Universiti Tenaga Nasional, 43000, Kajang, Selangor, Malaysia
4. Institute of Sustainable Energy, Universiti Tenaga Nasional, 43000, Kajang, Selangor, Malaysia
5. International School of Advanced Materials, South China University of Technology, 381 Wushan Road, Tianhe District, Guangzhou, Guangdong, P. R. China
6. Institute of Polymer Optoelectronic Materials and Devices, School of Materials Science & Engineering, South China University of Technology, 381 Wushan Rd, Tianhe District, Guangzhou, Guangdong Province, China