Tuning Halide Composition Allows Low Dark Current Perovskite Photodetectors With High Specific Detectivity

Tuning halide composition in perovskites is a powerful approach demonstrated to enhance the performance of perovskite photovoltaic devices where such compositional modifications drive improvements open-circuit voltage (Voc) and reduction nonradiative losses. Similarly, photodetectors (PDs) operate as light current conversion hence it relevant investigate whether enhancements can be achieved by similar strategies. Herein, PDs are fabricated with an inverted photodiode configuration based on MAPb(I1-xBrx)3 (MA = methylammonium) active layer over x 0–0.25 range. Interestingly, has been found that increasing Br content up 0.15 (15%) leads significant dark (Jd), values low 1.3 × 10?9 A cm?2 being alongside specific detectivity 8.7 1012 Jones. Significantly, observed exponential relationship between Jd their Voc 0–15% The superior performances 15% Br-containing attributed trap states, better charge extraction photogenerated carriers, improvement photoactive morphology crystallinity.