Semiconducting polymer-MXene blends with improved charge carrier mobilities and their application in field-effect transistors

• MXene blends enhance P3HT charge mobility by 370 % in TOFP measurements. • OFET mobility improves by 20 %, limited by contact resistance and interfacial effects. • MXene flakes establish low-resistance charge pathways in semiconducting polymers. • Blends maintain high on/off ratio, crucial for organic electronic applications. • MXene-doped P3HT films offer solution-processable high-mobility semiconducting inks. Ti 3 C 2 T x is the first successfully obtained member of the MXene family. Due to its many excellent properties such as high metallic conductivity, solubility and capacitance, it has attracted a wide interest in potential applications such as supercapacitors and energy storage devices. In the presented work, we have successfully produced various semiconducting thin-films consisting of Poly(3-hexylthiophene-2,5-diyl) (P3HT) organic semiconductor (OS) blended with MXene flakes with different MXenes concentrations. Time-of-flight photoconductivity (TOFP) measurements revealed a 370% enhancement in charge carrier mobility compared to neat P3HT. Organic field-effect transistors (OFETs) were also fabricated using these blends, showing a 20% improvement in field-effect mobility. This discrepancy arises due to contact resistance and interface effects in OFETs, which are absent in TOFP measurements. These results highlight the promise of P3HT:MXene blends for advanced electronic applications, where high mobility and straightforward processing are essential.