Charge Collection in Bulk Heterojunction Organic Photovoltaic Devices: An Impedance Spectroscopy Study

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dc.contributor.ISNI0000 0003 8600 0978 (Hsu, JWP)en_US
dc.contributor.LCNA243648305 (Hsu, JWP)en_US
dc.contributor.authorXu, Liangen_US
dc.contributor.authorLee, Yun-Juen_US
dc.contributor.authorHsu, Julia W. P.en_US
dc.date.accessioned2014-12-19T18:16:25Z
dc.date.available2014-12-19T18:16:25Z
dc.date.created2014-09
dc.description.abstractThrough thickness and applied bias variation, charge collection in poly(3-hexylthiophene):[6,6]-phenyl C61-butyric acid methyl ester (P3HT:PCBM) bulk heterojunction organic photovoltaic (OPV) devices was investigated with impedance spectroscopy. An equivalent circuit model incorporating chemical capacitance (Cμ), recombination resistance (R₂), and transport resistance (R₁) was used to analyze the results. Insufficient carrier extraction, exhibiting diffusion transport characteristics at high frequencies, was found in devices with a thick active layer. These devices also display a higher chemical capacitance, indicating greater carrier accumulation, and a lower recombination resistance, signaling increased bimolecular recombination. Increasing internal field with negative applied bias enhances carrier collection by reducing carrier accumulation and recombination. Moreover, we showed explicitly that charge collection can be quantified by (R₂/R₁)½, which is proportional to device fill factor. These results demonstrate that impedance spectroscopy is an effective tool for investigating charge collection in OPV devices.en_US
dc.description.sponsorship"This project is supported by the University of Texas at Dallas and National Science Foundation DMR-1305893."en_US
dc.identifier.citationXu, Liang, Yun-Ju Lee, and Julia W. P. Hsu. 2014. "Charge collection in bulk heterojunction organic photovoltaic devices: An impedance spectroscopy study." Applied Physics Letters 105(123904): 1-4.en_US
dc.identifier.issn0003-6951en_US
dc.identifier.issue123904en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/4237
dc.identifier.volume105en_US
dc.language.isoenen_US
dc.publisherAmer Inst Physicsen_US
dc.relation.urihttp://dx.doi.org/10.1063/1.4896633en_US
dc.rights©2014 AIP Publishing LLCen_US
dc.source.journalApplied Physics Lettersen_US
dc.subjectHeterojunction organic photovoltaic devicesen_US
dc.subjectImpedance spectroscopyen_US
dc.subjectCharge collectionen_US
dc.subjectRecombination resistanceen_US
dc.subjectTransport resistanceen_US
dc.titleCharge Collection in Bulk Heterojunction Organic Photovoltaic Devices: An Impedance Spectroscopy Studyen_US
dc.type.genrearticleen_US

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