Efficient carbazole-based small-molecule organic solar cells with an improved fill factor |
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| Authors: | Yongtao Liu Yanna Sun Miaomiao Li Huanran Feng Wang Ni Hongtao Zhang Xiangjian Wan Yongsheng Chen |
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| Affiliation: | State Key Laboratory and Institute of Elemento-Organic Chemistry, The Centre of Nanoscale Science and Technology, Key Laboratory of Functional Polymer Materials, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin 300071 China, |
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| Abstract: | In this study, a new acceptor–donor–acceptor (A–D–A) small molecule, DI3TCz, with carbazole as the central unit and 1,3-indanedione as the end group, was designed and synthesized for application in organic solar cells. In contrast to the molecule DR3TCz with rhodanine as end groups, DI3TCz exhibited deep a LUMO energy level and a nearly unchanged HOMO energy level with a narrow optical band gap of 1.75 eV and red shifted absorption. Compared with DR3TCz, the DI3TCz device showed a PCE of 6.46% with a remaining high Voc value of 0.97 V, improved Jsc of 10.40 mA cm−1 and a notable FF of 0.65, which is the highest PCE value reported to data for carbazole-based small molecules OPVs.In this study, a new acceptor–donor–acceptor (A–D–A) small molecule, DI3TCz, with carbazole as the central unit and 1,3-indanedione as the end group, was designed and synthesized for application in organic solar cells. |
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