Thickness-dependent optoelectronic properties of titanium carbide MXene

Abstract

Due to its tunable interlayer chemistry, MXene shows great potential in various sensor applications, but the optoelectronic properties of MXene are greatly hindered by the slow photoresponsivity of the intercalation chemistry. The main challenge to MXene in photoelectric sensor applications arises from its composite resistive properties. This paper analyzes the photoelectric responses separately by constructing singlelayer and multilayer structures. Under light, the resistance of a monolayer of MXene increases to 100.1% and recovers in 1 s. When the number of layers increases, the resistance of MXene quickly drops to 99.6% under light and recovers slowly within 15 s. In summary, this study reveals how MXene's layered structure affects its photoresponsivity, offering insights for advancing MXene-based optoelectronic sensors.