Halide perovskites have shown tremendous potential as active materials in various optoelectronic devices, including solar cells, light-emitting diodes and photodetectors. However, their relatively large bandgaps –typically limited to ~1.40 eV (~885 nm)–constrain their use as near-infrared (NIR) photodetectors. Here, we present a novel two-dimensional (2D) hybrid perovskite (PDA)2PbI4 (PDA = 6-phenyl-3,5-hexadiynylammonium), which upon thermopolymerization forms (poly-PDA) PbI4 (polyPDA = polymerized PDA). This material can be incorporated into NIR photodetectors that exhibit record-high responsivities of up 107 A/W and external quantum efficiencies of up to 144.4% at 980 nm under a 4 V biasAbstract text goes here. Notably, the devices can be fabricated, operated, and stored entirely under ambient air conditions, highlighting their stability and processability.
