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9-alkylidene-9H-fluorene-containing polymer for high-efficiency polymer solar cells

: Du, C.; Li, C.; Li, W.; Chen, X.; Bo, Z.; Veit, C.; Ma, Z.; Würfel, U.; Zhu, H.; Hu, W.; Zhang, F.


Macromolecules 44 (2011), Nr.19, S.7617-7624
ISSN: 0024-9297
ISSN: 1520-5835
Fraunhofer ISE ()
Solarzellen - Entwicklung und Charakterisierung; alternative Photovoltaik-Technologie; Farbstoff- und Organische Solarzellen

A novel donor-acceptor copolymer containing 9-alkylidene-9H-fluorene unit in the main chain, poly[9-(1-hexylheptylidene)-2,7-fluorene-alt-5,5- (4,7-di-2-thienyl-5,6-dialkoxy-2,1, 3-benzothiadiazole)] (PAFDTBT), has been synthesized and evaluated in bulk heterojunction polymer solar cells (BHJ PSCs). The polymer possesses a low band gap of 1.84 eV, a low-lying HOMO energy level (5.32 eV), and excellent solubility in common organic solvents. PSCs based on PAFDTBT and (6,6)-phenyl-C71-butyric acid methyl ester (PC71BM) demonstrate a power conversion efficiency (PCE) of 6.2% with a high fill factor (FF) of 0.70, which indicates that 9-alkylidene-9H-fluorene can be a very useful building block for constructing narrow band gap conjugated polymers for high-efficiency BHJ PSCs.