Efficiency of Exciton and Charge Carrier Photogeneration in a Semiconducting Polymer

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Efficiency of Exciton and Charge Carrier Photogeneration in a Semiconducting Polymer

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Title: Efficiency of Exciton and Charge Carrier Photogeneration in a Semiconducting Polymer
Author: Hendry, Euan
Schins, Juleon M.
Candeias, L. P.
Siebbeles, L. D. A.
Bonn, Mischa
Citation: 92 (19), article 196601
Publisher: American Physical Society
Journal: Physical Review Letters
Date Issued: 2004
URI: http://hdl.handle.net/10036/33212
DOI: 10.1103/PhysRevLett.92.196601
Links: http://dx.doi.org/10.1103/PhysRevLett.92.196601 http://link.aps.org/abstract/PRL/v92/e196601
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 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.
Type: Article
Description: Euan Hendry, Juleon M. Schins, L. P. Candeias, L. D. A. Siebbeles, and Mischa Bonn, Physical Review Letters, Vol. 92, article 196601 (2004). "Copyright © 2004 by the American Physical Society."
ISSN: 0031-90071079-7114


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