Fluorene-based low band-gap copolymers for high performance photovoltaic devices
- 8 March 2004
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 84 (10) , 1653-1655
- https://doi.org/10.1063/1.1667614
Abstract
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 heterojunctionpolymerphotovoltaic 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 (η 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.Keywords
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