Efficient carbazole-based small-molecule organic solar cells with an improved fill factor†,10.1039/C7RA10387E

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Lactoyl-CoA 全氟丁基戊烷白叶藤碱全氟己基辛烷新白叶藤碱壳寡糖特色专题-生物多肽

Efficient carbazole-based small-molecule organic solar cells with an improved fill factor†

Yongtao Liu,Yanna Sun,Miaomiao Li,Huanran Feng,Wang Ni,Hongtao Zhang,Xiangjian Wan,Yongsheng Chen

RSC Advances Pub Date : 01/26/2018 00:00:00 , DOI:10.1039/C7RA10387E

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 V_oc value of 0.97 V, improved J_sc 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.