Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 6, Issue 5, Pages 1589-1596Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ee00060e
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Funding
- NRF Singapore
- Netherlands Organization for Scientific Research (NWO)
- Engineering and Physical Sciences Research Council
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We report that we can enhance the performance of polymer photovoltaics by introducing materials with dipoles at the donor-acceptor interface of the polymer solar cells. We use a zwitterionic conjugated polyelectrolyte (ZCPE) as an interfacial layer in a model bi-layer system consisting of donor and acceptor polymers. We find an increase in short-circuit current and fill factor when a 2 nm thin layer of ZCPE is introduced between donor and acceptor polymers. Absorption of light in the ZCPE interlayer contributes to the photocurrent, and, as revealed by time-resolved pump-push optical spectroscopy, the interlayer reduces the probability of electron-hole recombination at the donor-acceptor interface.
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