Surface Modification of Ti <sub>3</sub> CN MXene and Their Enhanced Performance in Photodetection
Mingli Qin, Jiale Ai, Artem V. Kuklin, Ruijun Zhang, Jiahui Hou, Yiming Zhao, Han Zhang, Jian Zhang, Hans Ågren, Lingfeng Gao, Youju Huang
Abstract
Abstract As a typical hetero‐MXene, Ti 3 CN MXene has attracted great attentions owing to its ultrafast carrier dynamic and unique nonlinear optical response. However, the photo‐response of pristine Ti 3 CN is unsatisfied due to the fast carrier recombination. Herein, multi‐layer Ti 3 CN MXene is modified with well‐dispersed Bi quantum dots, where the Ti 3 CN@Bi heterojunction can not only tune the optical absorption but also introduce energy transfer channels. The built‐in electric field endows Ti 3 CN@Bi self‐powered response behavior and the performance can be further enhanced by tuning external conditions. As demonstrated, the Ti 3 CN@Bi‐based photodetectors exhibit high photocurrent density (18.24 µA cm −2 ) and excellent photoresponsivity (18.32 mA W −1 ). In addition, the device shows fast response and outstanding stability (0.002% for each cycle), holding great potentials for practical applications. Hence, this work not only highlights the broad prospects of MXene‐based heterojunction, but also provides great value for other optoelectronic device applications.