Figure 25.

Photodetectors based on MXenes. a) Ti₃C₂T_x/TiO₂ composites photodetector for UV photodetection. i) Schematics of Ti₃C₂T_x thin film photodetector where TiO₂ nanoparticles (green) are present between and on the surface of the MXene flakes. ii) Photocurrent transients of Ti₃C₂T_x thin films with and without UV irradiation in Ar gas. iii) Photoresponse of Ti₃C₂T_x thin film with and without UV irradiation and exposure to ambient air for 30 min. Reproduced with permission.^{[ 169 ]} Copyright 2018, American Chemical Society. b) Mo₂CT_x photodetector. i) Schematic illustration of a single‐layer Mo₂CT_x nanosheet. ii) Schematic illustration of an array Mo₂CT_x‐based flexible photodetectors. iii) Photoresponse behavior of Mo₂CT_x thin film photodetector under alternating on/off cycles at a wavelength of 660 nm with a light intensity of 0.22 W cm⁻². Reproduced with permission.^{[ 172 ]} Copyright 2019, WILEY‐VCH. c) Ti₃C₂T_x/CsPbBr₃ hybrid photodetector. i) TEM image of Ti₃C₂T_x/CsPbBr₃ nanocomposite. ii) The photoluminescence spectra of CsPbBr₃ NCs and CsPbBr₃/MXene‐n nanocomposites. Reproduced with permission.^{[ 170 ]} Copyright 2019, American Chemical Society. d) Schematic illustration of synthesis of crossed Zn₂GeO₄ NWs/ Ti₃C₂T_x hybrid structure. Reproduced with permission.^{[ 171 ]} Copyright 2020, American Chemical Society.