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The title question is addressed by careful steady state and fs fluorescence upconversion measurements. Changes in S 2 population decay times and S 2 –S 0 fluorescence intensities of ZnTPP observed when solvents like benzene are replaced by potentially electron-accepting solvents like CH 2 Cl 2 can be interpreted quantitatively in terms of variations in the solvent’s...
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 20wt%. The reported dependence...
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