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High-permittivity conjugated polyelectrolyte interlayers for high-performance bulk heterojunction organic solar cells

Kesters J., Govaerts S., Pirotte G., Drijkoningen J., Chevrier M., Van den Brande N., Liu X., Fahlman M., Van Mele B., Lutsen L., Vanderzande D., Manca J., Clément S., Von Hauff E. and Maes W.High-permittivity conjugated polyelectrolyte interlayers for high-performance bulk heterojunction organic solar cells,ACS Applied Materials & Interfaces,8(10): 6309-6314,2016 (MAR).

doi: 10.1021/acsami.6b00242

Conjugated polyelectrolyte (CPE) interfacial layers present a powerful way to boost the I-V characteristics of organic photovoltaics. Nevertheless, clear guidelines with respect to the structure of high-performance interlayers are still lacking. In this work, impedance spectroscopy is applied to probe the dielectric permittivity of a series of polythiophene-based CPEs. The presence of ionic pendant groups grants the formation of a capacitive double layer, boosting the charge extraction and device efficiency. A counteracting effect is the diminishing affinity with the underlying photoactive layer. To balance these two effects, we found copolymer structures containing nonionic side chains to be beneficial.

BibTeX

@article{,
    author  = "Kesters, J.; Govaerts, S.; Pirotte, G.; Drijkoningen, J.; Chevrier, M.; Van den Brande, N.; Liu, X.; Fahlman, M.; Van Mele, B.; Lutsen, L.; Vanderzande, D.; Manca, J.; Clément, S.; Von Hauff, E.; Maes, W.",
    title   = "High-permittivity conjugated polyelectrolyte interlayers for high-performance bulk heterojunction organic solar cells",
    journal = "ACS Applied Materials & Interfaces",
    year    = "2016",
    volume  = "8",
    number  = "10",
    pages   = "6309-6314",
    month   = "MAR",
    doi     = "10.1021/acsami.6b00242",
    note    = "",
}