A 2D Optoelectronic Logic Device with Ultralow Supply\nVoltage

Optoelectronic logic devices (OELDs) provide a cure for\nmany visually\nimpaired individuals. However, traditional OELDs have limitations,\nsuch as excessive channel resistance and complex structure, leading\nto high supply voltage and decreased efficiency of signal transmission.\nWe report ultralow-voltage OELDs by seriating two 2D MoTe<sub>2</sub> transistors with sub-10 nm channel lengths. The short channel length\nand atomically flat interface result in a low-resistance light-sensing\nunit that can operate with a low supply voltage and function well\nin weak-light conditions. The devices achieve an on state without\nlight signal input and an off state with light signal input at an\nultralow supply voltage of 50 mV, lower than the retinal bearing voltage\nof 70 mV. Additionally, MoTe<sub>2</sub>’s excellent optoelectronic\nproperties allow the device to perceive light from visible to near-infrared\nwavelengths with high sensitivity to weak light signals. The specific\nperception of visible light intensity is 0.03 mW·mm<sup>–2</sup>, and the near-infrared light intensity is 0.1 mW mm<sup>–2</sup>. The device also has a response time of 8 ms, meeting human needs.\nOur findings provide a promising solution for developing low-voltage\nartificial retinas.