High-performance pseudo-halide perovskite nanowire networks for stable and fast-response photodetector

Perovskite-based photodetectors show a great promise thanks to the material's excellent photogeneration and broadband device operation. Amongst the fundamental limitations of halide perovskites, humidity-induced degradation arises as the main impediment towards viable commercial-grade perovskite-based technologies. Here, we report a stable, reproducible and reliable pseudo halide perovskite nanowire network-based photo-detector with superior performances. The perovskite nanowire network is deposited using a two-step spin-coating process atop patterned substrates under ambient conditions with relative humidity (RH%), higher than 50%. Because of the particular 1D perovskite nanowire morphology, our devices require no charge collectors, which reduces fabrication steps and costs. Most importantly, we demonstrate that incorporation of lead thiocyanate (Pb(SCN)(2)) directly in the precursor solution promotes the synthesis of stable hybrid perovskite nanowire networks in ambient conditions. These devices exhibit response time as fast as 50 mu s and responsivities upto similar to 0.23 AW(-1) at 2 V bias. Also, the optimum photodetector exhibited high specific detectivity of 7.1 x 10(11) cm Hz(1/2) W-1. This novel and yet simple device architecture brings fabrication challenges to a minimum by allowing synthesis of perovskite nanowires under high humidity conditions.