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

Abstract

Flexible photodetectors (PDs) comprised of low-dimensional organic-inorganic hybrid perovskites having perovskite quantum dots are the next generation wearable optoelectronic devices. Here, a flexible Vis-NIR PD is designed containing 2D DJ perovskite (4AMP)(MA) 2 Pb 3 I 10 (4AMP = 4-(aminomethyl)piperidinium, MA = methylammonium) (n3) and the micro concentration of CsPbI 3 perovskite quantum dots (QDs) layered heterostructures. The device response under 660 nm light is increased to 615% controlled by the optimal concentration of QDs. The device combination as per the mass of QDs depicts strong photosensitivity and high-power output. The band gap between the two is minimal forming a matching structure which lowers the energy barrier of carrier transport process. QDs layer fills the gap of perovskite film forming an almost defect-free heterostructure. QDs layer isolates water and passivates the perovskite layer for the high-performance of optoelectronic devices. The degradation of PDs with the optimal concentration of QDs under up to 5000 bending cycles and different bending angles can be ignored, and the devices show a self-healing phenomenon with the increase of bending cycles. The optimized strategy will develop flexible, wearable, high-performance and low-cost PDs. QDs-concentration-dependent based on 0D-2D perovskite heterostructure was applied to enhance the performance of flexible photodetector.