Abstract
Halide perovskites are promising as emerging materials for perovskite photodetectors. Neotype photoelectric detection requires high responsivity and long operational stability, especially for extending the detecting range to the near-infrared spectrum. Herein, a perovskite photodetector combined the MA0.6FA0.4PbI3-xClx halide perovskite polycrystal with β-NaYF4:Yb/Er up-conversion nanoparticles. The device resulted in good performance, high responsiveness, and a wide detection range. The device had a high responsivity of 0.52 A/W at 985 nm. Moreover, CH3(NH2)2+ (FA+) reduced the defect density and enhanced film-forming properties. This improvement resulted in the perovskite photodetector stability over 2000 response cycles.
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