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Highly efficient polymer solar cells cast from non-halogenated xylene/anisaldehyde solution
Authors
D. Bahro
F. Buss
+8 more
A. Colsmann
M. Koppitz
D. Landerer
W. Schabel
P. Scharfer
A. Schulz
C. Sprau
M. Wagner
Publication date
1 January 2015
Publisher
Royal Society of Chemistry
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Cite
Abstract
Several high performance polymer:fullerene bulk-heterojunction photo-active layers, deposited from the non-halogenated solvents o-xylene or anisole in combination with the eco-compatible additive p-anisaldehyde, are investigated. The respective solar cells yield excellent power conversion efficiencies up to 9.5%, outperforming reference devices deposited from the commonly used halogenated chlorobenzene/1,8-diiodooctane solvent/additive combination. The impact of the processing solvent on the bulk-heterojunction properties is exemplified on solar cells comprising benzodithiophene-thienothiophene co-polymers and functionalized fullerenes (PTB7:PC71BM). The additive p-anisaldehyde improves film formation, enhances polymer order, reduces fullerene agglomeration and shows high volatility, thereby positively affecting layer deposition, improving charge carrier extraction and reducing drying time, the latter being crucial for future large area roll-to-roll device fabrication. © The Royal Society of Chemistry 2015
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info:doi/10.1039%2Fc5ee01917f
Last time updated on 02/01/2020
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Last time updated on 07/05/2019