All-optically controlled multifunctional logic gates based on the positive and negative photoresponse of a one-dimensional ZnO/CH3NH3PbBr3 heterostructure

Abstract

Optoelectronic logic gates, with high-speed, low-power consumption, and broad bandwidth, have attracted significant attention in high-density information processing applications. It would be more attractive and challenging to carry out multifunctional logic operations in an individual device due to the inherent nature of unidirectional carrier transport. Herein, a transistor-like one-dimensional ZnO/CH3NH3PbBr3 heterostructure is designed for an all-optically controlled logic gate that exhibits wavelength- and power-dependent bipolar photoresponse. Under visible light illumination, the device presents a negative photoresponse, while a transformation from negative to positive photoresponse emerges with increasing ultraviolet irradiation power. Time-resolved photoluminescence spectra demonstrate the carrier dynamics involving defect trapping about the negative-positive photoconductive switching. Based on the bipolar photoresponse, five fundamental logic operations (OR, AND, NOR, NOT, and NAND) are implemented in an individual device, which substantially enhances integration density while reducing power consumption. This work presents an optical sensing-computing integrated architecture for the multifunctional optoelectronic chips and non-Von Neumann intelligent sensors.