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Morphology, Temperature, and Field Dependence Separation in High-Efficiency Solar Cells Based on Polyquinoxaline Copolymer
FOM Institute AMOLF, Netherlands; University of Cambridge, England.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
FOM Institute AMOLF, Netherlands.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
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2016 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 120, no 8, 4219-4226 p.Article in journal (Refereed) Published
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Abstract [en]

Charge separation and recombination are key processes determining the performance of organic optoelectronic devices. Here we combine photoluminescence and photovoltaic characterization of organic solar cell devices with ultrafast multipulse photocurrent spectroscopy to investigate charge generation mechanisms in the organic photovoltaic devices based on a blend of an alternating polyquinoxaline copolymer with fullerene. The combined use of these techniques enables the determination of the contributions of geminate and bimolecular processes to the solar cell performance. We observe that charge separation is not a temperature-activated process in the studied materials. At the same time, the generation of free charges shows a dear external field and morphology dependence. This indicates that the critical step of charge separation involves the nonequilibrium state that is formed at early times after photoexcitation, when the polaronic localization is not yet complete. This work reveals new aspects of molecular level charge dynamics in the organic light-conversion systems.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2016. Vol. 120, no 8, 4219-4226 p.
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Biological Sciences
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URN: urn:nbn:se:liu:diva-126807DOI: 10.1021/acs.jpcc.5b10801ISI: 000371562000007OAI: oai:DiVA.org:liu-126807DiVA: diva2:917724
Note

Funding Agencies|Netherlands Organization for Scientific Research (NWO) through the "Stichting voor Fundamenteel Onderzoek der Materie" (FOM); VENI grant from NWO; Swedish Research Council (VR); European Commission Marie Sklodowska-Curie actions; Swedish Energy Agency; Knut and Alice Wallenberg foundation (KAW)

Available from: 2016-04-07 Created: 2016-04-05 Last updated: 2017-03-21

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