Vorobeva Nataliia S, Bagheri Saman, Torres Angel, Sinitskii Alexander
Department of Chemistry and Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln, Lincoln 68588, NE, USA.
Nanophotonics. 2022 Jul 14;11(17):3953-3960. doi: 10.1515/nanoph-2022-0182. eCollection 2022 Sep.
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 TiCT , the most popular MXene material to date. The electrical measurements were performed on devices based on individual monolayer TiCT 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 TiCT should facilitate the optoelectronic and photonic applications of MXenes.
二维过渡金属碳化物、氮化物和碳氮化物统称为MXenes，正在许多不同领域中得到广泛应用，包括光电子学和光子学，但关于它们的固有光响应的信息有限。在本研究中，我们研究了迄今为止最流行的MXene材料TiCT 的可见光和近红外光响应。电学测量是在基于单个单层TiCT MXene薄片的器件上进行的，这些器件通过各种显微镜和光谱方法进行了表征。对于具有不同电极布局的MXene器件，在可见光和近红外区域用白光或不同波长的激光照射下，电流可重复下降，从而证明了负光响应。对TiCT 固有光响应的理解应有助于MXenes在光电子学和光子学中的应用。
