Application of MXenes in Solution-Processed Optoelectronic Devices

MXenes, which are composed of transition metal carbides and/or nitrides, are emerging two-dimensional (2D) nanomaterials with unique layered structures and abundant surface functional groups, and possess excellent and tunable optical/electrical properties and solution processability. As a new generation of semiconductor optoelectronic devices, solution-processed organic/perovskite optoelectronic devices have received extensive attention and research due to the distinct advantages such as low cost, light weight, flexibility, and large-area printing. Herein, this review focuses on the application of MXenes in solution-processed organic/perovskite light-emitting diodes and solar cells, and comprehensively summarizes the versatile applications of MXenes in different functional layers, including electrode, interface layer, and emitting layer/active layer, for high-performance solution-processed optoelectronic devices. Some major challenges and future opportunities of MXenes applications in solution-processed optoelectronic devices are discussed and prospected.