Flexible Transparent Near-Infrared Photodetector Based on 2D Ti3C2 MXene-Te Van Der Waals Heterostructures†

Main observation and conclusion Ti3C2 MXene serving as superior electrical conductors presents more specific performance such as transparency, conductivity than gold (Au), and even could form a heterostructure with active materials of the functional devices. Here, a Ti3C2 MXene-Te microplate van der Waals heterostructure based transparent near-infrared photodetector (PD) is exploited. Compared with Au-Te PD, the on-off ratio of the Ti3C2-Te PD is improved by seven orders of magnitude and reaches 9.51 x 10(7) under 1064 nm laser illuminations. Benefiting from the utilization of flexible PET substrate and Ti3C2 conductors in manufacturing PD devices, the Ti3C2-Te PD exhibits excellent flexibility with no noticeable response change after being bent for different states and times. Moreover, 63% transmittance of the fabricated PD devices over the 500-1000 nm wavelength range is obtained. All the above results demonstrate the tremendous potential in wearable optoelectronics.

Automated summary

Ti3C2 MXene serves as superior electrical conductors and shows great potential in transparent near-infrared photodetectors, with high on-off ratio, flexibility, high transmittance, and applicability in wearable optoelectronic devices.