Flexible, UV-responsive perovskite photodetectors with low driving voltage
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Although lead halide perovskites with tunable band gaps are widely used for photodetection in the visible spectrum, very few studies have been focused on the use of perovskites in ultraviolet detection. Here, we report that MAPbI3−xClx-based photodetectors (PDs) show a response in the ultraviolet spectrum as well as yield very fast photoresponse speed (< 80 µs/90 µs) and excellent detectivity (1012 Jones with 365 nm lamp) with very low driving voltage (0.3 V). The results demonstrate the enhancement of photoelectric performance of the PDs in the ultraviolet spectrum is because the doping of Cl in MAPbI3 increases the bandgap and the crystalline grain size of MAPbI3−xClx film. Moreover, 10%PbCl2-MAPbI3−xClx-based flexible photodetectors displays remarkable mechanical flexibility.
This work was supported by National Natural Science Foundation of China under Grant Nos. 61421002, 61474015, 61574029 and 61471085. This work was also partially supported by University of Kentucky.
HL, DY and TZ designed experiments and carried out the measurements. PZ, FW, CQ and RY participated in the work to analyze the data and prepared the manuscript initially. SL and ZC gave equipment support. All authors read and approved the final manuscript.
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Conflict of interest
The authors declare that they have no conflict of interest.
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