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Issue 28, 2009
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Low band-gap polymers based on quinoxaline derivatives and fused thiophene as donor materials for high efficiency bulk-heterojunction photovoltaic cells

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Abstract

In this study we synthesized three low band-gap polymers—poly[2,3-bis(4-hexyloxyphenyl)quinoxaline-alt-2,5-thieno[3,2-b]thiophene] (PQTT), poly[2,3-bis(4-hexyloxyphenyl)quinoxaline-alt-3,6-dipentadecylthieno[3,2-b]thiophene] (PQPDTT) and poly[2,3-bis(4-hexyloxyphenyl)quinoxaline-alt-2,5-bis(thieno-2-yl)-3,6-dipentadecylthieno[3,2-b]thiophene] (PQTPDTT)—that are based on quinoxaline and thieno[3,2-b]thiophene, and examined their photovoltaic properties. The band-gaps of PQTT and PQTPDTT were 1.65eV and 1.7eV, respectively. For PQTPDTT, a HOMO level of −5.12eV, which was lower than that of P3HT, was observed. According to the analysis of the characteristics of the photovoltaic device using PC61BM and PC71BM as acceptors, an open circuit voltage (VOC) of 0.71V, a short circuit current (JSC) of 8.80mA/cm2, a fill factor of 0.36 and a power conversion efficiency (PCE) of 2.27% were observed at 100mW/cm2 (AM 1.5 illumination) when a PQTPDTT/PC71BM blend film was used as the active layer. A very high incident photon to current efficiency (IPCE) was detected (60% at 400nm, 57% at 500nm).

Graphical abstract: Low band-gap polymers based on quinoxaline derivatives and fused thiophene as donor materials for high efficiency bulk-heterojunction photovoltaic cells

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Publication details

The article was received on 06 Jan 2009, accepted on 21 Apr 2009 and first published on 03 Jun 2009


Article type: Paper
DOI: 10.1039/B823536H
J. Mater. Chem., 2009,19, 4938-4945

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    Low band-gap polymers based on quinoxaline derivatives and fused thiophene as donor materials for high efficiency bulk-heterojunction photovoltaic cells

    J. Lee, W. Shin, J. Haw and D. Moon, J. Mater. Chem., 2009, 19, 4938
    DOI: 10.1039/B823536H

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