Abstract
Herein, we propose a new strategy to develop air-stable n-type organic semiconductors with non-classical thiophene aromatic diimide derivatives by replacing aromatic naphthalene with a heteroaromatic isothianaphthene core. We designed and successfully synthesized the isothianaphthene core based diimide material, N,N′-bis(n-hexyl)isothianaphthene-2,3,6,7-tetra-carboxylic acid diimide (BTDI-C6) as an n-type semiconductor. Compared to N,N′-bis(n-hexyl)naphthalene-1,4,5,8-tetracarboxylic acid diimide (NDI-C6), BTDI-C6 possesses a deeper LUMO energy level of −4.21 eV, which is 0.32 eV lower than that of NDI-C6. Both molecular modelling and experimental results elucidated that organic thin film transistors (OTFTs) based on both of these materials exhibit comparable mobilities; however, the threshold voltage of BTDI-C6 based device (+7.5 V) is significantly lower than that of NDI-C6 based counterpart (+34 V). Moreover, the low-lying LUMO energy level of BTDI-C6 ensures excellent air-stability which is further validated by the device performance. In addition, BTDI-C6 shows high luminescence while NDI-C6 is not luminescent at all in solution, which reveals the potential application of our newly synthesized material in n-type light-emitting transistors.
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Acknowledgements
This work was supported by Shenzhen Science and Technology (JCYJ20170412151139619), Shenzhen Engineering Laboratory (Shenzhen development and reform commission [2016]1592), Guangdong Key Research Project (2019B010924003), Guangdong International Science Collaboration Base (2019A050505003), and Shenzhen Peacock Plan (KQTD2014062714543296).
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Chen, X., He, Y., Ali, M.U. et al. Isothianaphthene diimide: an air-stable n-type semiconductor. Sci. China Chem. 62, 1360–1364 (2019). https://doi.org/10.1007/s11426-019-9555-4
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DOI: https://doi.org/10.1007/s11426-019-9555-4