Organic Phototransistors Based on Self‐Assembled Microwires of n‐Type Distyrylbenzene Derivative

Abstract 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(trifluoro‐methyl)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 cm2 V−1 s−1) was observed as compared to thin‐film‐OPTs (μe: 2.7×10−3 cm2 V−1 s−1), most likely due to the single‐crystalline nature of the self‐assembled MWs. Moreover, the photoresponsivity of MW‐OPTs showed 23.53 (A W−1), which was 130 times higher than that of thin‐film OPTs (0.18 A W−1). Furthermore, the MW‐OPTs exhibited stable photoswitching properties an…