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• W2078271683 abstract "Exciton dynamics in alternating copolymer/fullerene solar cell blends have been investigated using femtosecond transient absorption spectroscopy. The acceptor concentrations have been varied over a wide range. Experimental data, kinetic modeling and simulations, all indicate that the efficiency of exciton conversion to charges is 100% even at acceptor concentrations as low as 20 wt%. The reported dependence of solar cell efficiency on fullerene concentration may thus arise from other factors. However, there exists an acceptor concentration threshold (5 wt%) below which a substantial fraction of the excitations remain unquenched. The results, we believe are very relevant to optimization of performance efficiency by clever manipulation of morphology. We have also observed exciton–exciton energy transfer in these blends at low acceptor concentrations." @default.
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• W2078271683 date "2008-06-01" @default.
• W2078271683 modified "2023-09-26" @default.
• W2078271683 title "Exciton dynamics in alternating polyfluorene/fullerene blends" @default.
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• W2078271683 doi "https://doi.org/10.1016/j.chemphys.2007.11.018" @default.
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