Solvated C70 single crystals for organic field effect transistors

Abstract

Fullerene C70 is an n-type semiconducting material, similar to C60, used in organic field-effect transistors (OFETs). However, studies on OFETs based on C70 are limited to thin films because of the difficulty in growing high-quality single crystals. In this work, we report OFETs using m-xylene-solvated C70 single-crystal needles grown using the liquid–liquid interfacial precipitation method. The maximum electron mobility was measured to be 1.32 × 10−2 cm2/Vs although the electrical contact in the devices might be low owing to the bottom-contact. The solvated C70 single-crystal needles exhibited good transport properties, comparable to the C60 single-crystal needles.