Optoelectronic reconfigurable 1T-VSe₂/2H-MoTe₂ Schottky junction for near-infrared switchable logic

Reconfigurable devices play a crucial role in the development of silicon semiconductor technology. However, there remains an urgent necessity to develop reconfigurable devices that are simpler to manufacture and provide a broader range of functions. Herein, we have fabricated an all-two-dimensional (2D) reconfigurable Schottky junction by artificially stacking metallic 1T phase VSe₂ and semiconducting 2H phase MoTe₂. Leveraging the adjustment of band bending of the ambipolar material MoTe₂ by gate voltage, the device achieved reversibly switchable carrier polarity type and gate-tunable rectification ratio ranging from 10² to 10⁻³. Correspondingly, the device shows obvious bidirectional photoresponse by changing gate voltage from −60 V to 60 V under 1064 nm illumination. Based on its excellent switchable photoresponse, we have constructed an optoelectronic logic device that can achieve photoelectric logic function switching. This work indicates the important role of all-2D Schottky junctions in reconfigurable logic optoelectronic devices. (Figure presented.)