Abstract
TiCl4 surface-treated SnO2 nanocrystal films were applied as photoanodes for photoelectrochemical self-powered UV photodetectors (UVPDs) and dye-sensitized solar cells (DCSs). It is found that the TiCl4-treated SnO2-based UVPD shows a higher photocurrent density (J) and open-circuit voltage (Voc) compared to the pure SnO2-based UVPD. The TiCl4-treated SnO2-based UVPD has a high on/off ratio of 6475, rapid response (0·009 s for rise time and 0·006 s for decay time), excellent spectral selectivity and linear optical signal response under UV light irradiance. In addition, the TiCl4-treated SnO2-based DSC with the ruthenium-based C106 dye also exhibits a higher power conversion efficiency (PCE) than that of the SnO2-based DSC. The effect of TiCl4 treatment on the performance of UVPDs and DSCs was investigated in detail by the incident photon-to-current conversion efficiency (IPCE), UV–vis absorption, electrochemical impedance, flat-band potential (VFB) and transient photoelectric decay measurements.
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