期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 135, 期 32, 页码 11920-11928出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja4043356
关键词
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资金
- Global Photonic Energy Corporation (GPEC)
- Department of Energy (DOE)
- Center for Energy Nanoscience (CEN) at USC
- National Science Foundation (NSF)
- King Abdullah University of Science and Technology (KAUST), through the Center for Molecular Photovoltaics (CAMP)
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1048807, 0840366] Funding Source: National Science Foundation
Fullerenes are currently the most popular electron-acceptor material used in organic photovoltaics (OPVs) due to their superior properties, such as good electron conductivity and efficient charge separation at the donor/acceptor interface. However, low absorptivity in the visible spectral region is a significant drawback of fullerenes. In this study, we have designed a zinc chlorodipyrrin derivative (ZCl) that absorbs strongly in the visible region (450-600 nm) with an optical density 7-fold higher than a C-60 film. ZCl efficiently transfers absorbed photoenergy to C-60 in mixed films. Application of ZCl as an energy sensitizer in OPV devices leads to an increase in the photocurrent from the acceptor layer, without changing the other device characteristics, i.e., open circuit voltage and fill factor. For example, C-60-based OPVs with and without the sensitizer give 4.03 and 3.05 mA/cm(2), respectively, while both have V-OC = 0.88 V and FF = 0.44. Our ZCl sensitization approach improves the absorbance of the electron-acceptor layer while still utilizing the beneficial characteristics of C-60 in OPVs.
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