High performance flexible photodetector based on 0D-2D perovskite heterostructure

ABSTRACT: Flexible photodetectors (PDs) comprised of low-dimensional organic-inorganic hybrid perovskites with perovskite quantum dots are expected to be the next generation wearable optoelectronic devices. A flexible Vis-NIR PD which contains 2D Dion-Jacobson (DJ) perovskite (4AMP)(MA)2Pb3I10 (4AMP = 4-(aminomethyl)piperidinium, MA = methylammonium) (n3) and micro concentration of CsPbI3 perovskite quantum dots (QDs) layered heterostructures was designed and synthesized in the current work. Controlled by the optimal concentration of QDs, the device response under 660 nm light was increased to 615%. The device combination as per mass of QDs exhibited strong photosensitivity and high-power output. The band gap between the two is minimal, which formed a matching structure and lowered the energy barrier of carrier transport process. QDs layer filled the gap of perovskite film, forming an almost defect-free heterostructure. QDs layer isolated water and passivated the perovskite layer, which therefore contributed to the high-performance of optoelectronic devices. Under the optimal concentration of QDs with up to 5000 bending cycles and different bending angles, the degradation of PDscouldbe ignored, and the devices tended to show a self-healing phenomenon with increasing bending cycles. The optimized strategy will be conducive to developing flexible, wearable, high-performance and low-cost PDs.