Ting-Yu WangHuangcheng LiuMiao LiuYen-Han ShihXinyu YuZhong’an LiCHU-CHEN CHUEH2024-11-052024-11-05202414639076https://www.scopus.com/record/display.uri?eid=2-s2.0-85206548015&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/722736To date, the development of high-performance n-type organic semiconductors has remained challenging due to the scarcity of highly electron-deficient π-conjugated structural units and the difficulty of controlling intermolecular packing in the thin-film state. In addition, there have been few reports on the use of dimer design to tune the optoelectronic properties of materials. Herein, we report new cyano-substituted fluoranthene imide-based dimers (F16 and F17) for small-molecule n-type organic semiconductors. It is noteworthy that substituents at different positions lead to different film morphologies and very distinct thermal aggregation behaviors due to different dihedral angles. The self-assembly behavior of F17 improves thermal stability. Therefore, F17, which has a closer cyano groups structure, exhibits better field-effect transistor performance, with a maximum mobility of 6.6 × 10−4 cm2 V−1 s−1, while F16 does not exhibit any transistor performance.false[SDGs]SDG7journal article10.1039/d4cp03245d2-s2.0-85206548015