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High photovoltage achieved in low band gap polymer solar cells by adjusting energy levels of a polymer with the LUMOs of fullerene derivatives
Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
Chalmers University.
Chalmers University.
Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik.
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2008 (Engelska)Ingår i: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 18, nr 45, s. 5468-5474Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Solar cells based on organic molecules or conjugated polymers attract great attention due to their unique advantages, such as low cost, and their use in flexible devices, but are still limited by their low power conversion efficiency (PCE). To improve the PCEs of polymer solar cells, more efforts have been made to increase short-circuit current (J(sc)) or open-circuit voltage (V-oc). However, the trade-off between J(sc) and V-oc in bulk heterojunctions solar cells makes it tricky to find a polymer with a low band gap to efficiently absorb photons in the visible and near infrared region of the solar spectrum, while maintaining a high V-oc in solar cells. Therefore, it is crucial to design and synthesize polymers with energy levels aligning with the LUMO (lowest unoccupied molecular orbital) of an electron acceptor to minimize the LUMO level difference between donor and acceptor to keep enough driving force for charge generation, thereby maximizing photovoltage in solar cells. Here a novel copolymer APFO-Green 9 was synthesized. Polymer solar cells based on APFO-Green 9 blended with a derivative of fullerene demonstrate high photovoltage by fine tuning the HOMO and LUMO level of APFO-Green 9. Solar cells based on APFO-Green 9 and [6,6]-phenyl-C71-butyric acid methyl ester ([70]PCBM) present a photoresponse extended to 900 nm with J(sc) of 6.5 mA cm(-2), V-oc of 0.81 V and PCE of 2.3% under illumination of AM1.5 with light intensity of 100 mW cm(-2). As a low band gap polymer with a V-oc bigger than 0.8 V, APFO-Green 9 is a promising candidate for efficient tandem solar cells.

Ort, förlag, år, upplaga, sidor
2008. Vol. 18, nr 45, s. 5468-5474
Nationell ämneskategori
Naturvetenskap
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URN: urn:nbn:se:liu:diva-16105DOI: 10.1039/b811957kOAI: oai:DiVA.org:liu-16105DiVA, id: diva2:133184
Tillgänglig från: 2009-01-08 Skapad: 2009-01-07 Senast uppdaterad: 2017-12-14

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Zhang, FenglingTvingstedt, KristoferBarrau, SophieInganäs, Olle

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Zhang, FenglingTvingstedt, KristoferBarrau, SophieInganäs, Olle
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Institutionen för teknik och naturvetenskapTekniska högskolanBiomolekylär och Organisk ElektronikInstitutionen för fysik, kemi och biologi
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