A Dry-Transfer\nMethod for Molecular Monolayer Crystals\ntoward Flexible High-Performance Organic Field-Effect Transistors

The single crystals of organic semiconductor crystals\n(SC-OSCs)\nhave displayed great potential in organic field-effect transistors\n(OFETs), given the high mobility brought by the long-range ordering\nand the absence of structural defects in SC-OSCs. Benefiting from\ntheir intrinsic flexibility and thinnest possible thickness, molecular\nmonolayer crystals (MMCs) are considered to be one of the optimum\ncandidates as the active layer in flexible OFETs. In this work, a\nnew dry-transfer method via an in situ vapor-deposited parylene film\non MMCs was developed for fabricating flexible OFETs. The transferred\nMMCs retained an atomically flat surface and long-range ordering and\nexhibited a conformal and residue-free interface with the dielectric\nlayer, thereby giving a high average mobility of 13.23 cm<sup>2</sup> V<sup>–1</sup> s<sup>–1</sup> to the flexible OFETs.\nTherefore, the presented method offers a new opportunity to overcome\nthe trade-off between high performance and good mechanical flexibility\nin flexible OFETs.