Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 10, Pages 1653-1655Publisher
AIP Publishing
DOI: 10.1063/1.1667614
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Low band-gap, soluble conjugated copolymers were synthesized from 9,9-dioctylfluorene and 4,7-di-2-thienyl-2,1,3-benzothiadiazole (PFO-DBT) and different composition ratios were used for the donor material in bulk heterojunction polymer photovoltaic cells (PVCs). In PVCs made with PFO-DBT:PCBM (methano-fullerene [6,6]-phenyl C61-butyric acid methyl ester) blends, the spectral response is extended up to 650 nm and the open-circuit voltage (V-oc) is improved to 0.95 V. The energy conversion efficiency (eta(e)) in devices with optimized composition reaches 2.24% under an AM1.5 solar simulator (78.2 mW/cm(2)). In contrast to organic PVCs previously published, these PVCs retain high energy conversion efficiency at illumination up to 5 suns of AM1.5 spectral illumination. This feature allows high efficiency polymer PVC modules made in combination with a light concentrator. (C) 2004 American Institute of Physics.
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