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.

中文翻译：

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Ti3C2T x MXene 单层中的负光响应

二维过渡金属碳化物、氮化物和碳氮化物，统称为 MXenes，在许多不同领域都有大量应用，包括光电子学和光子学，但关于其固有光响应的信息有限。在这项研究中，我们研究了 Ti 的可见光和近红外光响应3C2吨 X ，迄今为止最流行的 MXene 材料。电气测量是在基于单个单层 Ti 的设备上进行的3C2吨 X MXene 薄片，其特征在于各种微观和光谱方法。对于具有不同电极布局的 MXene 器件，在可见光和近红外区域的白光或不同波长的激光照射下，电流可重现地降低，从而显示出负光响应。对 Ti 的本征光响应的理解3C2吨 X 应该促进 MXenes 的光电和光子应用。