2017
DOI: 10.1103/physrevb.95.134202
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Effect of polaron diffusion on exciton-polaron quenching in disordered organic semiconductors

Abstract: Exciton-polaron quenching (EPQ) is a major efficiency loss process in organic optoelectronic devices, in particular at high excitation densities. Within commonly used models, the rate is assumed to be given by the product of the exciton density, the polaron density, and a constant EPQ rate coefficient, which is proportional to the polaron diffusion coefficient and an EPQ capture radius. In this work, we study the effects of polaron diffusion on the EPQ rate in energetically disordered materials with a Gaussian… Show more

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Cited by 35 publications
(42 citation statements)
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References 37 publications
(53 reference statements)
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“…That may be viewed as a result of a "competition" between polarons that can each quench the nearby triplet. An analogous effect has been theoretically predicted [16] and experimentally found [13,17] for the case of TTA at high initial triplet volume densities and from a KMC simulation study of NN-type TPQ [8].…”
Section: A No-diffusion and Strong-diffusion Limitssupporting
confidence: 69%
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“…That may be viewed as a result of a "competition" between polarons that can each quench the nearby triplet. An analogous effect has been theoretically predicted [16] and experimentally found [13,17] for the case of TTA at high initial triplet volume densities and from a KMC simulation study of NN-type TPQ [8].…”
Section: A No-diffusion and Strong-diffusion Limitssupporting
confidence: 69%
“…For the case of immediate NN-type TPQ, a significant enhancement of the rate with increasing field was found [8]. The enhancement is due to a "polaron wind effect," which is analogous to the effect of electric fields on the rate of diffusion-controlled reactions between ions in solution [26].…”
Section: B Simulation Results and Analysismentioning
confidence: 95%
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