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Molecular Engineering of Dithiafulvene Organic Sensitizers with Pyridine Acceptor for High Efficiency Dye-sensitized Solar Cells

Authors Cao, Yaxiong
Cheng, Jun
Zhang, Fang
Liang, Xiaozhong
Li, Jie
Guo, Kunpeng
Yang, Shihe View this author's profile
Issue Date 2016
Source Science China Materials , v. 59, (10), October 2016, p. 797-806
Summary Donor-pi-acceptor (D-pi-A) organic compounds have drawn keen interests as photosensitizers in dye sensitized solar cells (DSSCs). Recent studies showed that pyridine ring as an electron-withdrawing anchoring group could lead to efficient electron injection. To improve the performance of pyridine containing sensitizers based DSSCs, the electron donor, p-bridge and the whole structure should be well engineered at molecular level. In this work, we prepared two monomer type dithiafulvene based sensitizers both with a pyridine acceptor but differing in the phenyl-thienyl (DTFPy3) and thienyl-phenyl pi -bridges (DTFPy4), and two corresponding dimeric congeners D-DTFPy3 and D-DTFPy4, and tested them in DSSCs. It was found that the arrangement of the electron-rich thienyl group adjacent to the electron donor moiety in the p-bridge red-shifted in the absorption, and the dimeric sensitizers exhibited significantly enhanced absorption. Among them, D-DTFPy4 garnered the highest light harvesting efficiency, yielding an overall power conversion efficiency up to 5.26%.
ISSN 2095-8226
Language English
Format Article
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