Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 41, Pages 16480-16487Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm12145f
Keywords
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Funding
- Fundamental R&D Program for Core Technology of Materials
- Ministry of Knowledge Economy, Republic of Korea
- National Research Foundation of Korea
- Korean Government (MEST) [NRF-2009-C1AAA001-2009-0093526]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10037203] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2009-0093526] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Three donor-acceptor type copolymers, poly[9,9'-dioctylfluorene-alt-2,5-bis(seleno-2-yl)-2,3-bis(4-hexyloxyphenyl) quinoxaline] (PFSeQ), poly[9-(1'-octylnonylidene)fluorene-alt-2,5-bis(seleno-2-yl)2,3-bis(4-hexyloxyphenyl) quinoxaline] (PAFSeQ), and poly[N-9'-heptadecanyl-2,7-carbazole-alt-2,5-bis(seleno-2-yl)-2,3-bis(4-hexyloxyphenyl) quinoxaline] (PCSeQ), were synthesized through Suzuki coupling reactions for use as organic photovoltaic materials with high V(OC) values. In these polymers, selenophene, which has stronger electron-donating property than thiophene, was adopted as a spacer. The polymers had relatively low optical band gaps (<1.9 eV). We investigated bulk heterojunction type polymer solar cells based on the synthesized polymers used as electron donor materials and [6,6]-phenyl C61 butyric acid methyl ester (PC(61)BM) or [6,6]-phenyl C71 butyric acid methyl ester (PC(71)BM) used as the acceptor. The power conversion efficiency (PCE) of the devices was in the range of 1.1-3.3% under AM 1.5G illumination (100 mW cm(-2)). Among these polymers, PFSeQ exhibited the best device performance with a power conversion efficiency (PCE) of 3.3% upon the introduction of PC(71)BMas the acceptor. This is the highest performance among photovoltaic materials containing selenophene units.
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