Digital-Analog Integrated Optoelectronic Memristor Based on Carbon Dot for Ternary Opto-Electronic Logic and Sen-Memory Applications

Optoelectronic memristor with light as an additional stimulus is generating interest in various remarkable optical-electrical-coupled applications. Herein, an optoelectronic memristor with hybrid digital-analog switching behavior is developed by incorporating carbon dots (CDs) into the polymethylmethacrylate and the polystyrene layers as charge trapping medium. The memristor exhibits tri-stable digital switching behavior under electro-optical programming and analog switching behavior under optical programming. For the digital switching, the SET and RESET voltage of the memristor can be modulated through UV light illumination. Taking advantage of the cooperation of electrical and light stimuli, new ternary optoelectronic logic algorithm implementations with all-electric or all-optical signals as inputs are proposed. For the analog switching, the device resistance can be gradually modulated through UV light illumination and output intensity- and duration-dependent characteristics. These features endow the memristor with fused image sensing-and-memory (sen-memory) capability without an auxiliary bias. In addition, the sen-memory can perform image contrast enhancement operation as the preprocessing operation of the human retina, which can improve the subsequent image recognition rate in the processing tasks. The multifunctional memristor highlights the potential for ternary optoelectronic computing and artificial vision applications, and also, is expected to expand the application scopes of CDs.