Passivation of 1D@3D perovskite ferroelectric film with hydrophobic molecules for ferro-pyro-phototronic effect-based self-driven photodetector

High-performance, self-driven photodetectors in commercial and public applications show promising prospects. The pyro-phototronic effect is a promising method for building these detectors, but limitations in interfacial contact conditions hinder the use of the ferro-pyro-phototronic effect. By modifying the surface of 1D@3D perovskite ferroelectric film with tetra-ethyl ammonium (TEAI) molecules, the interfacial defect density is reduced, resulting in a high-performance, stable photodetector. Moreover, the passivation can greatly enhance the ferro-pyro-phototronic effect, which can be explained by the increased band bending and decreased trap states at the SnS/perovskite interface resulting in less re-distribution of charge carriers directly across the interface. Our work offers a feasible and effective method for producing pyro-phototronic responses in perovskite films-based devices, and thus presents a feasible solution for high-performance, self-driven and flexible photodetection.