Single-crystal MAPbI3 microwire arrays by a bilayer flexible interface confinement method for photodetectors

Abstract

It is a challenge to synthesize high-quality MAPbX₃ single-crystal microwires (MWs) under gentle conditions owing to their sensitivity to humidity and brittleness. We herein propose a facile bilayer flexible polymer confinement method to obtain high-quality MAPbI₃ single-crystal microwires in air. The MAPbI₃ microwire-based photodetector exhibits a superior responsivity of 77.96 A W⁻¹, an EQE of 1.86 × 10⁴%, and an ultrahigh detectivity of 6.97 × 10¹³ Jones owing to the efficient carrier transport and excellent crystallinity with few defects. Furthermore, photodetectors based on the MAPbI₃ microwire arrays present superior performance with a detectivity of 3.09 × 10¹³ Jones, which is more than 160% and 7700% higher than that of the photodetectors based on the MAPbI₃ microwires and polycrystalline film at 254 μW cm⁻².