Evidence for space-charge-limited conduction in organic photovoltaic cells at open-circuit conditions

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Di Nuzzo, DanieleTechnical University of Eindhoven, Netherlands (författare)

Evidence for space-charge-limited conduction in organic photovoltaic cells at open-circuit conditions

Artikel/kapitelEngelska2013

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American Physical Society,2013
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LIBRIS-ID:oai:DiVA.org:liu-141435
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-141435URI
https://doi.org/10.1103/PhysRevB.87.085207DOI

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Språk:engelska
Sammanfattning på:engelska

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Funding Agencies|Dutch Polymer Institute (DPI) [631]
The ac admittance of solar cells under illumination is investigated under open-circuit conditions. Open-circuit conditions are imposed by inserting a probe capacitor into the circuit. The capacitance and conductance of the cells are investigated as function of frequency and continuous illumination intensity. Results are compared with numerical and analytical modeling of charge recombination and transport. In bulk heterojunction solar cells with [6,6]-Phenyl-C-61(C-71)-butyric acid methyl ester as acceptor and poly(3-hexylthiophene) or poly[2-methoxy-5-(2-ethylhexyloxy)-p-phenylene vinylene] as electron donor, the high-frequency capacitance C and conductance G follow a power-law dependence on intensity of white light I, with G(I) proportional to I-3/4 and C(I) proportional to I-1/4. The modeling shows that these dependencies can be explained in terms of space-charge-limited current in combination with Langevin type recombination of carriers. For poly[2,1,3-benzothiadiazole-4,7-diyl[4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b]dithiophene-2,6-diyl]] the capacitance shows a weaker dependence on intensity, indicating fast recombination of photogenerated carriers. Results indicate that the fill factor of relatively well performing polymer solar cells can still be limited by space charge effects and can be improved by enhancing the charge carrier mobility or by reducing the bimolecular Langevin recombination. DOI: 10.1103/PhysRevB.87.085207

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NATURVETENSKAP Fysik Annan fysik hsv//swe
NATURAL SCIENCES Physical Sciences Other Physics Topics hsv//eng

Biuppslag (personer, institutioner, konferenser, titlar ...)

van Reenen, StephanTechnical University of Eindhoven, Netherlands (författare)
Janssen, Rene A. J.Technical University of Eindhoven, Netherlands (författare)
Kemerink, MartijnTechnical University of Eindhoven, Netherlands(Swepub:liu)marke89 (författare)
Meskers, Stefan C. J.Technical University of Eindhoven, Netherlands (författare)
Technical University of Eindhoven, Netherlands (creator_code:org_t)

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Ingår i:Physical Review B. Condensed Matter and Materials Physics: American Physical Society87:81098-01211550-235X

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Av författaren/redakt...: Di Nuzzo, Daniel ...; van Reenen, Step ...; Janssen, Rene A. ...; Kemerink, Martij ...; Meskers, Stefan ...

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Av lärosätet: Linköpings universitet

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