1. School of Physics and Materials Science, Nanchang University, Nanchang 330031, PR China
2. Institute of Photovoltaics, Nanchang University, Nanchang 330031, PR China
3. Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Resources and Environment, Nanchang University, Nanchang 330031, PR China
4. School of Chemistry & Chemical Engineering, Nanchang University, Nanchang 330031, PR China