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- Title
Tuning the Isomeric Fused Heteroaromatic Core of Small Donor-Acceptor Molecules to Alter Their Crystalline Nature and Enhance Photovoltaic Performance.
- Authors
Dang, Dongfeng; Xiao, Manjun; Zhou, Pei; Zhong, Juan; Fan, Jiang; Su, Ning; Xiong, Wenjing; Yang, Chuncheng; Wang, Qiong; Wang, Yafei; Pei, Yong; Yang, Renqiang; Zhu, Weiguo
- Abstract
Novel donor-acceptor-type molecules, endo-DBST(BT-Cz)2 and exo-DBST(BT-Cz)2, were designed with benzothiadiazole-carbazole (BT-Cz) based arms and isomeric cores of dibenzosexithiophene (DBST), in which sulfur atoms at two lateral thienos in DBST are face-to-face for the endo-derivative and back-to-back for exo-derivative. In contrast to the endo-type, the exo-form exhibited highly crystalline properties, leading to an increased hole mobility up to 1.1 × 10-4 cm V-1s-1. A significant effect of the isomeric DBST cores on the photovoltaic properties was also observed in the organic photovoltaic (OPV) cells. The maximum power conversion efficiency of 2.13 % with a fill factor up to 61.41 % was obtained for the exo-DBST(BT-Cz)2-based devices, which are 1.2 times higher than that in the endo-DBST(BT-Cz)2-based cells. Our results demonstrate that tuning the isomeric core would increase the carrier mobility significantly and consequently enhance the photovoltaic performance of the resulting molecules in OPV cells.
- Subjects
AROMATIC compound synthesis; CARBAZOLE; CHEMICAL synthesis; AMINE synthesis; PERFORMANCE of photovoltaic cells; ORGANIC synthesis
- Publication
European Journal of Organic Chemistry, 2015, Vol 2015, Issue 4, p820
- ISSN
1434-193X
- Publication type
Article
- DOI
10.1002/ejoc.201403350