Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 123, Issue 10, Pages 5826-5832Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b10918
Keywords
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Funding
- Malaysian Government MyBrainSc
- KAUST project [OSR-2015-CRG-2572]
- KAUST
- EC FP7 Project SC2 [610115]
- EPSRC [EP/G037515/1, EP/M005143/1]
- EC H2020 [643791]
- EPSRC [EP/M005143/1] Funding Source: UKRI
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Solar cells based on blends of the donor polymer, P3HT, with the nonfullerene acceptor, O-IDTBR, have been shown to exhibit promising efficiencies and stabilities for low-cost organic photovoltaic devices. We focus herein on the charge separation and recombination dynamics in such devices. By employing selective wavelength excitations of P3HT and O-IDTBR, we show that photoexcitation of P3HT results in lower internal quantum efficiency (IQE) for photocurrent generation than that observed for photoexcitation of O-IDTBR Transient absorption and photoluminescence quenching studies indicate that this lower IQE results primarily from higher geminate recombination losses of photogenerated charges following P3HT excitation compared with O-IDTBR excitation, rather than from differences in exciton separation efficiency. These higher geminate recombination losses result in lower photocurrent generation efficiency at short circuit upon selective excitation of the P3HT donor, when compared with O-IDTBR excitation.
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