Efficiency of Exciton and Charge Carrier Photogeneration in a Semiconducting Polymer
Hendry, Euan; Schins, Juleon M.; Candeias, L. P.; et al.Siebbeles, L. D. A.; Bonn, Mischa
Date: 13 May 2004
Journal
Physical Review Letters
Publisher
American Physical Society
Publisher DOI
Abstract
We determine the efficiencies for the formation of excitons and charge carriers following ultrafast photoexcitation of a semiconducting polymer (MEH-PPV). The simultaneous, quantitative determination of exciton and charge photoyields is achieved through subpicosecond studies of both the real and the imaginary components of the complex ...
We determine the efficiencies for the formation of excitons and charge carriers following ultrafast photoexcitation of a semiconducting polymer (MEH-PPV). The simultaneous, quantitative determination of exciton and charge photoyields is achieved through subpicosecond studies of both the real and the imaginary components of the complex conductivity over a wide frequency range. Predominantly excitons, with near-unity quantum efficiency, are generated on excitation, while only a very small fraction (<10-2) of free charges are initially excited, consistent with rapid (∼100 fs) hot exciton dissociation. These initial charges are very short lived, decaying on subpicosecond time scales.
Physics and Astronomy
Faculty of Environment, Science and Economy
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