1. Fujian Provincial Key Laboratory of Semiconductors and Applications Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices Department of Physics Xiamen University Xiamen 361005 P. R. China
2. School of Energy and Chemical Engineering Xiamen University Malaysia Sepang 43900 Malaysia
3. College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
4. School of Electrical and Computer Engineering Xiamen University Malaysia Sepang 43900 Malaysia