Study On Properties Of Dual-terminal Device Based On Individual MAPbI₃ Micro/nanofiber

As energy crisis become increasingly prominent,exploring new energy materials is widely regarded as an important means.Organic-inorganic hybrid perovskite?OHP?has become a new generation of new energy materials for its high efficiency and low cost,which brings new hopes and opportunities for the future energy field.The perovskite nanofiber structure has higher photo-generated carrier transport efficiency and optical anisotropy than the film structure.In order to further improve the charge extraction efficiency of perovskites and explore the properties of perovskite nanofiber structures,the two-terminal devices of MAPbI₃ micro/nanofibers were obtained by self-assembly method.The properties were discussed,such as optical properties,piezoresistive effect and resistive switching?RS?.?1?The morphology and structure were characterized and analyzed via SEM,XRD and X-ray XPS,the results showed the highly crystalline MAPbI₃micro/nanofibers were tetragonal structures.?2?By applying different illumination conditions and voltage,the optical performance of two-terminal MAPbI₃ photodetectors was studied.The results showed that the MAPbI₃ photodetectors had a light response range of 200-900 nm under illumination at a bias voltage of 1 V.The contact of MAPbI₃ micro/nanofibers with the Ag electrode formed a Schottky barrier contact,which had the characteristics of a back-to-back diode.?3?The piezoresistive properties of the device were studied under static and dynamic strain,respectively.The results showed,whether under only strain or under a coupling effect of strain and light,the resistance of device exhibited a decrease as the compressive strain increases,and it became larger as the tensile strain increases.?4?the evolution of the XRD pattern and the I-V curves of the MAPbI₃micro/nanofiber were observed,light-induced antipolar resistive switching?RS?effect is demonstrated in an individual MAPbI₃ micro-/nanofiber–based two-terminal device after aging for 4 d.Antipolar RS is employed to realize the application of nonvolatile memories.In addition,the study further analyzed the conduction mechanism of NDR behavior,which is attributed to the reversible electrochemical reaction of the device.In view of the different performance of MAPbI₃ micro/nanofiber devices,and it is instructive for further understanding the special properties of devices.