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Relating the open-circuit voltage to interface molecular properties of donor:acceptor bulk heterojunction solar cells
Hasselt University.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics . Linköping University, The Institute of Technology.
Hasselt University.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics . Linköping University, The Institute of Technology.
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2010 (English)In: PHYSICAL REVIEW B, ISSN 1098-0121, Vol. 81, no 12, 125204- p.Article in journal (Refereed) Published
Abstract [en]

The open-circuit voltage (V-oc) of polymer:fullerene bulk heterojunction solar cells is determined by the interfacial charge-transfer (CT) states between polymer and fullerene. Fourier-transform photocurrent spectroscopy and electroluminescence spectra of several polymer:fullerene blends are used to extract the relevant interfacial molecular parameters. An analytical expression linking these properties to V-oc is deduced and shown to be valid for photovoltaic devices comprising three commonly used conjugated polymers blended with the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). V-oc is proportional to the energy of the CT states E-CT. The energetic loss q Delta V between E-CT and qV(oc) vanishes when approaching 0 K. It depends linearly on T and logarithmically on illumination intensity. Furthermore q Delta V can be reduced by decreasing the electronic coupling between polymer and fullerene or by reducing the nonradiative recombination rate. For the investigated devices we find a loss q Delta V of similar to 0.6 eV at room temperature and under solar illumination conditions, of which similar to 0.25 eV is due to radiative recombination via the CT state and similar to 0.35 eV is due to nonradiative recombination.

Place, publisher, year, edition, pages
American Physical Society , 2010. Vol. 81, no 12, 125204- p.
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Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-54852DOI: 10.1103/PhysRevB.81.125204ISI: 000276248900077OAI: oai:DiVA.org:liu-54852DiVA: diva2:310863
Note
Original Publication: Koen Vandewal, Kristofer Tvingstedt, Abay Gadisa, Olle Inganäs and Jean V Manca, Relating the open-circuit voltage to interface molecular properties of donor:acceptor bulk heterojunction solar cells, 2010, PHYSICAL REVIEW B, (81), 12, 125204. http://dx.doi.org/10.1103/PhysRevB.81.125204 Copyright: American Physical Society http://www.aps.org/ Available from: 2010-04-16 Created: 2010-04-16 Last updated: 2010-04-19

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Tvingstedt, KristoferInganäs, Olle

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