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Performance improvement of polymer solar cells by using a solvent-treated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) buffer layer
7.F. L. Zhang, K. G. Jespersen, C. Bjorstrom, M. Svensson, M. R. Andersson, V. Sundstrom, K. Magnusson, E. Moons, A. Yartsev, and O. Inganas, Adv. Funct. Mater. 16, 667 (2006).
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Photovoltaic performance of the polymersolar cell (PSC) based on poly(3-hexylthiophene) (P3HT) as donor and [6,6]-phenyl--butyric acid methyl ester (PCBM) as acceptor was improved by using the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) modification layer treated by ethanol or 2-propanol. Power conversion efficiency (PCE) of the PSC based on P3HT:PCBM (1:1, w/w) with the 2-propanol-treated PEDOT:PSS modification layer reached 4.74%, in comparison with a PCE of 3.39% for the PSC with the PEDOT:PSS layer without the organic solvent treatment. The enhanced performance of the PSCs is attributed to higher conductivity and optimized surface morphology of the PEDOT:PSS layers treated by the organic solvent.
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