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Enhanced Efficiency of PTB7 : PC61BM Organic Solar Cells by Adding a Low Efficient Polymer Donor

Farinhas, J. ; Oliveira, R. ; Ferreira, Q. ; Morgado, J. ; Charas, A.

International Journal of Photoenergy Vol. 2017, Nº -, pp. 1 - 8, January, 2017.

ISSN (print): 1110-662X
ISSN (online): 1687-529X

Journal Impact Factor: 1,563 (in 2014)

Digital Object Identifier: 10.1155/2017/4501758

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Abstract
Ternary blend polymer solar cells combining two electron-donor polymers, poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-
b:4,5-b󸀠
]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl] (PTB7) and poly[2,5-bis(3-
dodecylthiophen-2-yl)thieno[3,2-b]thiophene] (pBTTT) and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM), as electronacceptor,
were fabricated. The power conversion efficiency of the ternary cells was enhanced by 18%, with respect to the reference
binary cells, for a blend composition with 25% (wt%) of pBTTT in the polymers content. The optimized device performance was
related to the blend morphology, nonrevealing pBTTT aggregates, and improved charge extraction within the device.