In-plane anisotropic two-dimensional (2D) materials offer great opportunities for developing novel polarization sensitive photodetectors without being in conjunction with filters and polarizers. However, owing to low linear dichroism ratio and insufficient optical absorption of the few layer 2D materials, the comprehensive performance of the present polarization sensitive photodetectors based on 2D materials is still lower than the practical application requirements. In this work, after systematic investigation of the structural, vibrational, and optical anisotropies of layer-structured Te nanosheets, a novel polarization-sensitive self-powered imaging photodetector with high comprehensive performance based on a p-Te/n-MoSe2 van der Waals heterojunction (vdWH) with strong interlayer transition is proposed. Owing to the high rectification ratio (104) of the diode, the device shows excellent photovoltaic characteristics. As examples, the photodetectors exhibited an ultrahigh on/off ratio of 105 at a relatively weak light intensity (4.73 mw cm-2), and the highest responsivity of the device could reach 2106 mA W-1 without any power supply. In particular, benefitting from the excellent dichroism properties of Te nanosheets synthesized in this work, the anisotropic ratio of the photocurrent (Imax/Imin) could reach as high as 16.39 (405 nm, 24.2 mw cm-2). This value obtained under zero bias voltage is much greater than that of present 2D material photodetectors even at a bias voltage. In addition, the highest detectivity is 2.91 × 1013 Jones at a low bias voltage of -0.08 V. This work provides a novel building block for high resolution polarization-sensitive photodetection of weak signals in complex environments.

High performance polarization-sensitive self-powered imaging photodetectors based on a p-Te/n-MoSe2 van der Waals heterojunction with strong interlayer transition.

Two-dimensional transition-metal dichalcogenides (2D-TMDCs) have shown great promise for sustainable energy production via electrocatalytic, photocatalytic, and photovoltaic activities. Here, we re...

Photosensitive WS2/ZnO Nano-Heterostructure-Based Electrocatalysts for Hydrogen Evolution Reaction

Electrophoretic Deposition of MoSe2–MoOx Nanosheets for Enhanced Electrocatalytic Hydrogen Evolution Reaction

Hybrid 2D/0D SnSe2-SnO2 vertical junction based high performance broadband photodetector

Flexible piezo-resistive pressure sensor based on conducting PANI on paper substrate

Highly sensitive and flexible pressure sensor based on two-dimensional MoSe2 nanosheets for online wrist pulse monitoring.

Large area, broadband and highly sensitive photodetector based on ZnO-WS2/Si heterojunction

2-D transition metal dichalcogenide (TMDC)-based heterostructures are promising active materials for high-performance optoelectronic devices. The low-cost, large-area, and high-quality fabrication ...

Vikas Patel

Papers

Highly sensitive and flexible pressure sensor based on two-dimensional MoSe2 nanosheets for online wrist pulse monitoring.

Large area, broadband and highly sensitive photodetector based on ZnO-WS2/Si heterojunction

Solution-Processed Uniform MoSe2–WSe2 Heterojunction Thin Film on Silicon Substrate for Superior and Tunable Photodetection

Electrophoretic Deposition of MoSe2–MoOx Nanosheets for Enhanced Electrocatalytic Hydrogen Evolution Reaction

Flexible piezo-resistive pressure sensor based on conducting PANI on paper substrate