Jia Song1,2, Jing Wang1,2, Xiaoyu Lin1, Jingfu He1, Hualei Liu1, Yongpeng Lei3,4, Zengyong Chu1
1College of Science, National University of Defense Technology, Changsha, 410072 China
2these authors contributed equally to this work
3College of Basic Education, National University of Defense Technology, Changsha, 410072 China
4School of Aeronautics and Astronautics, Central South University, Changsha 410083, China
Tóm tắt
AbstractBlack phosphorus (BP) shows broad application in optical, photoelectric and semiconductor fields. Herein, BP nanosheets and few‐layer phosphorene were prepared by means of a solvent exfoliation method. The absorption and fluorescence spectra of BP were measured and dye‐sensitized solar cells (DSSCs) were fabricated using BP/TiO2 films as working electrodes. The results show that the light‐absorption ability of BP depends on the number of layers and few‐layer phosphorene can absorb ultraviolet light (260–325 nm) specifically. The decrease of interfacial transport resistance and the increase of the utilization of sunlight favor the enhanced photoelectric conversion (η) of ≈38 % compared with TiO2 films. The stability of few‐layer phosphorene was also studied and the reduction of the corresponding η was mainly due to the defects caused by chemical etching which impeded electron transport. In all, there is a good reason to believe that if we can find an effective way to solve the seal problems in the devices, few‐layer phosphorene will be an excellent candidate in optical, photoelectric and semiconductor fields.
