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- Title
Small-molecule solar cells with efficiency over 9%.
- Authors
Zhang, Qian; Kan, Bin; Liu, Feng; Long, Guankui; Wan, Xiangjian; Chen, Xiaoqing; Zuo, Yi; Ni, Wang; Zhang, Huijing; Li, Miaomiao; Hu, Zhicheng; Huang, Fei; Cao, Yong; Liang, Ziqi; Zhang, Mingtao; Russell, Thomas P.; Chen, Yongsheng
- Abstract
At present, state-of-the-art single-junction organic photovoltaic devices have power conversion efficiencies of >9% and >8% for polymer- and small-molecule-based devices, respectively. Here, we report a solution-processed organic photovoltaic device based on DRCN7T, which employs an oligothiophene-like small molecule with seven conjugation units as the backbone and 2-(1,1-dicyanomethylene)rhodanine as the terminal unit. With [6,6]-phenyl C71-butyric acid methyl ester (PC71BM) as the acceptor, an optimized power conversion efficiency of 9.30% (certified at 8.995%) is achieved. The DRCN7T-based devices have a nearly 100% internal quantum efficiency, which we believe is due to an optimized nanoscale interpenetrating donor/acceptor network (with highly crystalline donor fibrils with diameters of ∼10 nm, close to the exciton diffusion length in organic materials) and the use of an efficient electron transport layer.
- Subjects
SOLAR cells; PHOTOVOLTAIC power systems; SMALL molecules; ELECTRIC power conversion; ELECTRON transport
- Publication
Nature Photonics, 2015, Vol 9, Issue 1, p35
- ISSN
1749-4885
- Publication type
Article
- DOI
10.1038/nphoton.2014.269