A newly-designed photoelectrochemical self-powered detector is applied to an α-Ga2O3 nanorod array to realize the detection of solar-blind ultraviolet light (wavelengths below 300 nm) and fast response (rise time of 0.076 s and decay time of 0.056 s).
TiO2-based
core–shell structure has gained enormous
significance and has developed as a promising candidate in photoelectrochemical
(PEC) devices due to its excellent properties. Despite studies, the
surface/interface chemistry in these nanostructures has not been fully
understood and there is still much room to further improve the performance
of related PEC devices. Here, using a closely integrated experimental
investigation and mechanism analysis, we scrutinized the intrinsic
role of the MgO coating in the photocurrent enhancement of TiO2@MgO core–shell structured UVPDs. We evidenced that
after coating with MgO, the photocurrent of UVPDs has been significantly
enhanced and the optimal coating time was found to be 45 min. A large
responsivity of 365 mA W–1 at 360 nm and a simultaneously
excellent on/off ratio of 16 739 are achieved, which have rarely
reported previously. In addition, the structure–property relationships
are well established in all studied UVPDs through comparing investigations.
The superior performance is postulated to be strongly correlated to
the suppression of the recombination of photogenerated electron with
I3
– in electrolyte. This work sheds some
light on searching for new structures for next-generation low cost,
large area, and energy-efficient optoelectronic devices.
The dye-sensitized solar cell (DSSC) is one candidate among the third-generation solar cells. The performance of most DSSCs based on TiO2 photoanode was limited by the low electron mobility within TiO2. To produce a much higher power conversion efficiency, Sn-doped TiO2 nanowire arrays were successfully prepared using a simple hydrothermal process. It was found that Sn doping augments electron mobility well and raises the flat band potential to improve the performance of DSSCs. The power conversion efficiency (η) of a DSSC based on the reasonable Sn-doped TiO2, N719 dye, platinized counter electrode and iodide/triiodide electrolyte reaches 8.75%. Furthermore, with an anatase TiO2 light scattering layer, a DSSC based on the Sn-doped TiO2 NWAs exhibits a remarkable power conversion efficiency of 9.43%, which is especially useful in weak light conditions.
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