Exploring the potential of two-dimensional bismuth–copper hybrid double perovskites for memristor applications

Abstract

Hybrid double perovskites (HDPs) have attracted considerable attention due to their potential in optoelectronics. However, the exploration of their properties for memristor devices has not yet been undertaken. In this study, we introduce a novel two-dimensional HDP, (H₂MPP)₂BiCuI₈, where H₂MPP = 1-methylpiperidinium-4-amine, characterized by its structured layering, narrow band gap of 1.65 eV, and enhanced stability. More importantly, this HDP was utilized as a functional layer to prepare a memristor device with an Ag/(H₂MPP)₂BiCuI₈/ITO sandwich structure, which exhibits pronounced RS behavior. In particular, the device exhibits a gradual increase in conductance, followed by a distinct transition at voltages above approximately 0.37 V. Building on this observation, we revealed that the charge conduction mechanism is primarily driven by the space charge limited current (SCLC) model, which provides significant insights into charge transport dynamics in HDP memristors. We believe that this work will provide useful information for the development of high-performance HDP memristor devices.