期刊
SCIENCE
卷 343, 期 6170, 页码 512-516出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1246249
关键词
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资金
- Engineering and Physical Sciences Research Council
- Winton Programme (Cambridge) for the Physics of Sustainability
- Fonds quebecois de recherche sur la nature et les technologies
- Corpus Christi College
- National Research Foundation Singapore
- Royal Society
- Center for Energy Efficient Materials, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DC0001009]
- Engineering and Physical Sciences Research Council [EP/G060738/1] Funding Source: researchfish
- EPSRC [EP/G060738/1] Funding Source: UKRI
Understanding the charge-separation mechanism in organic photovoltaic cells (OPVs) could facilitate optimization of their overall efficiency. Here we report the time dependence of the separation of photogenerated electron hole pairs across the donor-acceptor heterojunction in OPV model systems. By tracking the modulation of the optical absorption due to the electric field generated between the charges, we measure similar to 200 millielectron volts of electrostatic energy arising from electron-hole separation within 40 femtoseconds of excitation, corresponding to a charge separation distance of at least 4 nanometers. At this separation, the residual Coulomb attraction between charges is at or below thermal energies, so that electron and hole separate freely. This early time behavior is consistent with charge separation through access to delocalized pi-electron states in ordered regions of the fullerene acceptor material.
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