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n‐Type Azaacenes Containing B←N Units |
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| Authors: | Yang Min Dr. Chuandong Dou Dr. Hongkun Tian Prof. Yanhou Geng Prof. Jun Liu Prof. Lixiang Wang |
| Affiliation: | 1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, P. R. China;2. University of Chinese Academy of Sciences, Beijing, P. R. China;3. School of Material Science and Engineering and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, P. R. China |
| Abstract: | We disclose a novel strategy to design n‐type acenes through the introduction of boron–nitrogen coordination bonds (B←N). We synthesized two azaacenes composed of two B←N units and six/eight linearly annelated rings. The B←N unit significantly perturbed the electronic structures of the azaacenes: Unique LUMOs delocalized over the entire acene skeletons and decreased aromaticity of the B←N‐adjacent rings. Most importantly, these B←N‐containing azaacenes exhibited low‐lying LUMO energy levels and high electron affinities, thus leading to n‐type character. The solution‐processed organic field‐effect transistor based on one such azaacene exhibited unipolar n‐type characteristics with an electron mobility of 0.21 cm2 V?1 s?1. |
| Keywords: | acenes B– N coordination bonds electron mobility n-type semiconductors organic field-effect transistors |