Photodetectors based on lead halide perovskites often show excellent performance but poor stability. Herein, we demonstrate a photodetector based on MAPbBr single crystals passivated with an ultrathin layer of PbSO, which shows superior detectivity and on/off ratios compared to the control device due to the combined effect of lower surface traps, reduced recombination and low dark current. In addition, the device retained ∼56% of its initial * with an impressive on/off ratio of ∼801 after one year compared to ∼22% of * and an on/off ratio of ∼6 of the control device.
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