Flexible Transparent Near‐Infrared Photodetector Based on 2D Ti 3 C 2 MXene‐Te Van Der Waals Heterostructures †

Main observation and conclusion Ti 3 C 2 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 Ti 3 C 2 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 Ti 3 C 2 ‐Te PD is improved by seven orders of magnitude and reaches 9.51 × 10 7 under 1064 nm laser illuminations. Benefiting from the utilization of flexible PET substrate and Ti 3 C 2 conductors in manufacturing PD devices, the Ti 3 C 2 ‐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.