Dual-function surfactant strategy for two-dimensional organic semiconductor crystals towards high-performance organic field-effect transistors

Two-dimensional (2D) organic semiconductor crystals (OSCs) are ideal platforms for investigating fundament materials as well as achieving high-performance organic field-effect transistors (OFETs). The surfactants played an important role in the 2DOSCs growth in previous studies. However, residual surfactants may cause performance degradation of devices. Herein, a simple and effective dual-function surfactant strategy is used to control the growth of large-area few-molecular-layer 2DOSCs The introduction of phosphatidylcholine decreases the interfacial tension and improves the crystal growth dynamics, resulting in high-quality and large-area few-molecular-layer 2,6-bis(4-hexylphenyl)anthracene (C6-DPA) 2DOSC. The additive also passivates charge traps, boosting the mobility of 2DOSC-based OFETs by almost threefold. This method is also suitable for the growth of various high-quality 2DOSCs, opening up a new avenue for high-quality 2DOSCs towards high-performance OFETs.