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Black Phosphorus/TiO 2 Composite Photoanode with Enhanced Photoelectrical Performance
Author(s) -
Song Jia,
Wang Jing,
Lin Xiaoyu,
He Jingfu,
Liu Hualei,
Lei Yongpeng,
Chu Zengyong
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700220
Subject(s) - phosphorene , exfoliation joint , materials science , photoelectric effect , black phosphorus , semiconductor , optoelectronics , absorption (acoustics) , layer (electronics) , etching (microfabrication) , ultraviolet , chemical engineering , nanotechnology , graphene , band gap , composite material , engineering
Black 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/TiO 2 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 TiO 2 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.