Abstract
Polymorphism of organic semiconductor films is of key importance for the performance of organic thin film transistors (OTFTs). Herein, we demonstrate that the polymorphism of solution-processed organic semiconductors in thin film transistors can be controlled by finely tuning the surface nanostructures of substrates with self-assembled monolayers (SAMs). It is found that the SAMs of 12-cyclohexyldodecylphosphonic acid (CDPA) and 12-phenyldodecylphosphonic acid (PhDPA) induce different polymorphs in the dip-coated films of 2-dodecyl[1]benzothieno[3,2-b][1]benzothiophene (BTBT-C12). The film of BTBT-C12 on CDPA exhibits field effect mobility as high as 28.1 cm2 V−1 s−1 for holes, which is higher than that of BTBT-C12 on PhDPA by three times. The high mobility of BTBT C12 on CDPA is attributable to the highly oriented films of BTBT C12 with a reduced in-plane lattice and high molecular alignment.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51603124, 51703042), the Shenzhen Sci & Tech Research Grant (JCYJ20180305124832322), the University Grants Committee of Hong Kong (AoE/P-03/08) and the Chinese University of Hong Kong (3132678). We thank Shanghai Synchrotron Radiation Facility (beamline BL14B1) for providing beam time and assistance during the experiments.
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Liu, D., Xiao, X., He, Z. et al. Control of polymorphism in solution-processed organic thin film transistors by self-assembled monolayers. Sci. China Chem. 63, 1221–1229 (2020). https://doi.org/10.1007/s11426-020-9793-2
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DOI: https://doi.org/10.1007/s11426-020-9793-2