Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 15, Issue 10, Pages 1617-1622Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200500211
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By applying the specific fabrication conditions summarized in the Experimental section and post-production annealing at 150 degrees C, polymer solar cells with power-conversion efficiency approaching 5 % are demonstrated. These devices exhibit remarkable thermal stability. We attribute the improved performance to changes in the bulk heterojunction material induced by thermal annealing. The improved nanoscale morphology, the increased crystallinity of the semiconducting polymer, and the improved contact to the electron-collecting electrode facilitate charge generation, charge transport to, and charge collection at the electrodes, thereby enhancing the device efficiency by lowering the series resistance of the polymer solar cells.
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