In:
Applied Physics Letters, AIP Publishing, Vol. 89, No. 15 ( 2006-10-09)
Abstract:
Efficient polymer solar cells based on a low band gap copolymer poly{(9,9-dioctylfluorene)-2,7-diyl-alt-[4,7-bis(3-decyloxythien-2-yl)-2,1,3-benzothiadiazole]-5′,5″-diyl} and (6,6)-phenyl-C71-butyric acid methyl ester (C70-PCBM) were demonstrated with 2.4% power conversion efficiency under air mass 1.5G, 100mW∕cm2 illumination. The broad absorption peak of C70-PCBM in 440–530nm complements the absorption valley (regions between two absorption peaks at 416 and 584nm) of the polymer. The external quantum efficiency measurement further demonstrates that this increased absorption contributes significantly to the generation of photocurrent. Morphology studies on the blend films indicated that excellent miscibility between polymer and C70-PCBM favors exciton separation. The linear relationship between light intensity and short circuit current density shows efficient and balanced charge transport resulting in increased photocurrent and fill factor.
Type of Medium:
Online Resource
ISSN:
0003-6951
,
1077-3118
Language:
English
Publisher:
AIP Publishing
Publication Date:
2006
detail.hit.zdb_id:
211245-0
detail.hit.zdb_id:
1469436-0
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