LAUSR

Molecular design and crystallinity control are important issues for the development of high-performance organic optoelectronic devices. Here, a highly photo-responsive n-type organic small molecular semiconductor, (2Z,2’Z)3,3’-(2,5-dimethoxy-1,4-phenylene)bis(2-(3,5-bis(trifluoromethyl)phenyl)acrylonitrile) (DM-R), was synthesized and the photoelectronic properties of self-assembled DM-R microwire organic phototransistors (MW-OPTs) were studied. Significant enhancement in the electron mobility (μe) of MW-OPTs (μe: 0.16 cmV 1 s ) was observed as compared to thin-film-OPTs (μe: 2.7×10 3 cmV 1 s ), most likely due to the singlecrystalline nature of the self-assembled MWs. Moreover, the photoresponsivity of MW-OPTs showed 23.53 (AW ), which was 130 times higher than that of thin-film OPTs (0.18 AW ). Furthermore, the MW-OPTs exhibited stable photoswitching properties and a faster charge accumulation/release rate than those of thin-film OPTs. The results obtained herein demonstrate a facile solution-based approach for the fabrication of high-performance n-type organic MW-OPTs and provide a systematic analysis platform of the photo-generated charge carrier dynamics.