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Proceedings Paper

Development of Si-bridged conjugated donor polymers for high-efficiency bulk-heterojunction photovoltaic devices
Author(s): Ergang Wang; Li Wang; Lingfeng Lan; Junwu Chen; Junbiao Peng; Yong Cao
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Paper Abstract

We report the synthesis and photovoltaic properties of poly[2,7-(9, 9-di-n-octyl-silafluorene)-alt-5,5''-(4', 7'-di-2-thienyl-2',1',3'-benzothiadiazole)] (PSiF-DBT). The polymer heterojunction solar cells fabricated from PSiF-DBT as the electron donor blended with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as the electron acceptor exhibited a high powerconversion efficiency up to 5.4% with an open-circuit voltage of 0.90 V, a short-circuit current density of 9.5 mA cm-2 and a fill factor of 50.7% under the illumination of AM 1.5 G from a solar simulator (800 W m-2). A comparative study between PSiF-DBT and its polyfluorene analogous PFDTBT and PFO-DBT demonstrates that the high performance of PSiF-DBT originated from its red-shifted absorption spectrum up to 680 nm and high mobility of 1 × 10-3 cm2 V-1 s-1 compared with 645 nm and 3 × 10-4 cm2 V-1 s-1 for corresponding polyfluorene derivatives, respectively. These results indicate polysilafluorene derivatives are a promising new class of donor materials for polymer solar cells.

Paper Details

Date Published: 25 September 2008
PDF: 10 pages
Proc. SPIE 7052, Organic Photovoltaics IX, 70520W (25 September 2008); doi: 10.1117/12.799373
Show Author Affiliations
Ergang Wang, South China Univ. of Technology (China)
Li Wang, South China Univ. of Technology (China)
Lingfeng Lan, South China Univ. of Technology (China)
Junwu Chen, South China Univ. of Technology (China)
Junbiao Peng, South China Univ. of Technology (China)
Yong Cao, South China Univ. of Technology (China)

Published in SPIE Proceedings Vol. 7052:
Organic Photovoltaics IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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