Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 33, Pages 17091-17097Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta04758g
Keywords
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Funding
- National Natural Science Foundation of China [21421004, 91433106, 21175043, 21301059]
- Science and Technology Commission of Shanghai Municipality [11JC1403100, 12NM0504101]
- Fundamental Research Funds for the Central Universities in China
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Besides the relatively high redox potential of the adopted S2-/S-n(2-) polysulfide redox couple electrolyte, the parasitic charge recombination process is another significant factor that limits the open-circuit voltage and consequent power conversion efficiency (PCE) of quantum dot sensitized solar cells (QDSCs). Herein, we report a facile method to modify the polysulfide electrolyte with the addition of polyethylene glycol (PEG) additives to suppress the charge recombination occurring at the TiO2/QDs/electrolyte interfaces. Impedance spectroscopy and open circuit voltage decay (OCVD) measurements reveal that the PEG additive in the polysulfide electrolyte reduces interfacial recombination when compared with the conventional polysulfide electrolyte in the absence of the PEG additive. A dramatic enhancement of PCE from 5.80% to 6.74% was observed with the introduction of 15 wt% PEG in the polysulfide electrolyte in CdSe based QDSCs. Moreover, the PEG additive also improves the photovoltaic performance stability of the resultant cells.
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