A review on optoelectronic device applications of 2D transition metal carbides and nitrides

As a new branch of two-dimensional materials, MXenes are considered to have distinguished and controllable optical and electronic properties. Consequently, MXenes could play important roles in optoelectronic device applications, such as: transparent conductive electrode, conducting additives, and charge transfer layers. In this review, we summarized the unique optical and electronic properties of MXenes as well as recent advances in their optoelectronic device applications. Firstly, the excellent and adjustable optical and electronic properties of MXenes are introduced. Secondly, recent progress in optoelectronic device applications of MXenes, such as: photodetectors, photovoltaic devices, light emitting diodes, are summarized. Finally, some major challenges and opportunities towards the practical optoelectronic device applications of MXenes, which need be further investigated, have been discussed. We hope our work could guide the following development and research of MXenes-based optoelectronic devices.