Improving carrier transport in polymer films by incorporating MoS₂ nanosheets

This article presents the results of study of the carrier transport in thin films of two dimensional (2D) MoS₂ and a polythiophene based polymer (P3HT) nanohybrids. Temperature dependent electrical measurements within a temperature range from 113 K to 293 K have been carried out to elucidate the effect of 2D MoS₂ on charge transport. We experimentally demonstrate that the charge transport mechanism in composite films spans from Ohmic to space charge limited conduction depending upon applied bias. The numerical modeling reveals a marked enhancement of the hole mobility in polymer-MoS₂ (PG-MoS₂) films. We discuss the possible mechanisms behind the improved carrier mobility in the films of PG-MoS₂ nanosheets. Our work establishes the incorporation of 2D semiconducting nanosheets as a viable approach for improving carrier transport in films of organic semiconductors. (paper)