Negative photoresponse in Ti₃C₂T_x MXene monolayers

Authors

Nataliia S. Vorobeva, University of Nebraska-Lincoln
Saman Bagheri, University of Nebraska-LincolnFollow
Angel Torres, University of Nebraska-Lincoln
Alexander Sinitskii, University of Nebraska-LincolnFollow

Date of this Version

7-14-2022

Citation

N. S. Vorobeva et al.: Negative photoresponse in Ti3C2Tx MXene monolayers. https://doi.org/10.1515/nanoph-2022-0182

Comments

Open Access. © 2022 the author(s), published by De Gruyter

Abstract

Two-dimensional transition metal carbides, nitrides, and carbonitrides, collectively known as MXenes, are finding numerous applications in many different areas, including optoelectronics and photonics, but there is limited information about their intrinsic photoresponse. In this study, we investigated the visible and near-infrared range photoresponse of Ti₃C₂T_x, the most popular MXene material to date. The electrical measurements were performed on devices based on individual monolayer Ti₃C₂T_x MXene flakes, which were characterized by a variety of microscopic and spectroscopic methods. For MXene devices with different electrode layouts, the current reproducibly decreased under illumination with either white light or lasers with different wavelengths in the visible and near-infrared region, thus demonstrating a negative photoresponse. The understanding of the intrinsic photoresponse of Ti₃C₂T_x should facilitate the optoelectronic and photonic applications of MXenes.