Synergistic\nEffect of Ionic Liquid and Embedded QDs\non 2D Ferroelectric Perovskite Films with Narrow Phase Distribution\nfor Self-Powered and Broad-Band Photodetectors

2D layered metal halide perovskites (MHPs) are a potential\nmaterial\nfor fabricating self-powered photodetectors (PDs). Nevertheless, 2D\nMHPs produced via solution techniques frequently exhibit multiple\nquantum wells, leading to notable degradation in the device performance.\nBesides, the wide band gap in 2D perovskites limits their potential\nfor broad-band photodetection. Integrating narrow-band gap materials\nwith perovskite matrices is a viable strategy for broad-band PDs.\nIn this study, the use of methylamine acetate (MAAc) as an additive\nin 2D perovskite precursors can effectively control the width of the\nquantum wells (QWs). The amount of MAAc greatly affects the phase\npurity. Subsequently, PbSe QDs were embedded into the 2D perovskite\nmatrix with a broadened absorption spectrum and no negative effects\non ferroelectric properties. PM6:Y6 was combined with the hybrid ferroelectric\nperovskite films to create a self-powered and broad-band PD with enhanced\nperformance due to a ferro-pyro-phototronic effect, reaching a peak\nresponsivity of 2.4 A W<sup>–1</sup> at 940 nm.