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Synthesis, Characterization, and Devices of a Series of Alternating Copolymers for Solar Cells
Chalmers.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
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2009 (English)In: CHEMISTRY OF MATERIALS, ISSN 0897-4756, Vol. 21, no 15, 3491-3502 p.Article in journal (Refereed) Published
Abstract [en]

In this study we report the synthesis, characterization. and photovoltaic properties of a series of six Conjugated polymers based on donor-acceptor-donor (DAD) structure. The polymers are obtained via Suzuki polymerization of different alkoxy-substituted DAD monomers together with a substituted fluorene or phenylene monomer. Application of polymers as light-harvesting and electron-donating materials in solar cells, in conjunction with both [60]PCBM and [70]PCBM as acceptors, show power-conversion efficiencies (PCEs) up to 2.9%, values obtained without extensive optimization work. Furthermore, atomic force microscopy and field-effect transistor (FET) mobility measurements of acceptor-polymer mixtures show that differences in substitution on the polymers affect morphology, mobility, and device performance. Within the series of polymers, all showing similar optical absorption and redox behavior, substituents play an important role in phase separation on a micrometer scale, which in turn has a large impact on device performance. The phase-separation behavior is clearly seen in [70]PCBM devices where the best-performing devices are obtained using the polymers with short alkoxy groups or no substituents together with a high speed of spin coating during device preparation.

Place, publisher, year, edition, pages
2009. Vol. 21, no 15, 3491-3502 p.
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Natural Sciences
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URN: urn:nbn:se:liu:diva-19909DOI: 10.1021/cm802949gOAI: oai:DiVA.org:liu-19909DiVA: diva2:231638
Available from: 2009-08-14 Created: 2009-08-14 Last updated: 2015-06-01

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Zhang, FenglingAndersson, MattiasBarrau, SophieInganäs, Olle

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Biomolecular and Organic ElectronicsThe Institute of TechnologyFaculty of Science & Engineering
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