Gate and Bias Voltage‐Modulation Photodetector Based on Cs₃Bi₂Br₉ for Multifunctional Optoelectronic Logic Gate

Abstract Optoelectronic logic gates (OELGs) are considered a promising alternative to traditional electronic logic gates, thanks to their high computational speed and low power consumption. Meanwhile, there are enormous challenges including complex structures and single‐function. In this study, the optoelectronic logic gate device is prepared merely through a single Cs₃Bi₂Br₉ photodetector. The bidirectional photoresponsive behavior of the device is exhibited under bias voltages and the logic gates of the device are modulated by the change of the current level. The five fundamental OELGs (AND, OR, NOR, NOT, and NAND) are demonstrated successfully by applying a bias voltage of ±1 mV. Moreover, the five OELGs can be modulated by adjusting the gate voltage. To create a multifunctional logic gate array platform, a 5 × 5 array is constructed with 100% accuracy for the five basic OELGs. For practical applications, these logic gate arrays demonstrate great potential in imaging and image logic processing.