Role of diffusion in two-dimensional bimolecular recombination

A. V. Nenashev; F. Jansson; S. D. Baranovskii; R. Österbacka; A. V. Dvurechenskii; F. Gebhard

doi:10.1063/1.3435469

Role of diffusion in two-dimensional bimolecular recombination

A. V. Nenashev, F. Jansson, S. D. Baranovskii, R. Österbacka, A. V. Dvurechenskii, F. Gebhard

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16 Citations (Scopus)

Abstract

Experiments on carrier recombination in two-dimensional organic structures are often interpreted in the frame of the Langevin model with taking into account only the drift of the charge carriers in their mutual electric field. While this approach is well justified for three-dimensional systems, it is in general not valid for two-dimensional structures where the contribution of diffusion can play a dominant role. We study the two-dimensional Langevin recombination theoretically and find the critical concentration below which diffusion cannot be neglected. For typical experimental conditions, neglecting the diffusion leads to an underestimation of the recombination rate by several times.

Original language	English
Article number	213304
Journal	Applied Physics Letters
Volume	96
Issue number	21
DOIs	https://doi.org/10.1063/1.3435469
Publication status	Published - 27 May 2010
MoE publication type	A1 Journal article-refereed

Funding

We are indebted to Professor Gytis Juška for stimulating discussions and to Dr. A. Zinovieva for reading the manuscript and giving valuable comments. Financial support from the Academy of Finland under Project No. 116995, from the Deutsche Forschungsgemeinschaft (GRK 790), and from the Fonds der Chemischen Industrie is gratefully acknowledged.

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abstract = "Experiments on carrier recombination in two-dimensional organic structures are often interpreted in the frame of the Langevin model with taking into account only the drift of the charge carriers in their mutual electric field. While this approach is well justified for three-dimensional systems, it is in general not valid for two-dimensional structures where the contribution of diffusion can play a dominant role. We study the two-dimensional Langevin recombination theoretically and find the critical concentration below which diffusion cannot be neglected. For typical experimental conditions, neglecting the diffusion leads to an underestimation of the recombination rate by several times.",

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AU - Baranovskii, S. D.

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AU - Dvurechenskii, A. V.

AU - Gebhard, F.

N1 - Funding Information: We are indebted to Professor Gytis Juška for stimulating discussions and to Dr. A. Zinovieva for reading the manuscript and giving valuable comments. Financial support from the Academy of Finland under Project No. 116995, from the Deutsche Forschungsgemeinschaft (GRK 790), and from the Fonds der Chemischen Industrie is gratefully acknowledged. Copyright: Copyright 2010 Elsevier B.V., All rights reserved.

PY - 2010/5/27

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N2 - Experiments on carrier recombination in two-dimensional organic structures are often interpreted in the frame of the Langevin model with taking into account only the drift of the charge carriers in their mutual electric field. While this approach is well justified for three-dimensional systems, it is in general not valid for two-dimensional structures where the contribution of diffusion can play a dominant role. We study the two-dimensional Langevin recombination theoretically and find the critical concentration below which diffusion cannot be neglected. For typical experimental conditions, neglecting the diffusion leads to an underestimation of the recombination rate by several times.

AB - Experiments on carrier recombination in two-dimensional organic structures are often interpreted in the frame of the Langevin model with taking into account only the drift of the charge carriers in their mutual electric field. While this approach is well justified for three-dimensional systems, it is in general not valid for two-dimensional structures where the contribution of diffusion can play a dominant role. We study the two-dimensional Langevin recombination theoretically and find the critical concentration below which diffusion cannot be neglected. For typical experimental conditions, neglecting the diffusion leads to an underestimation of the recombination rate by several times.

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Role of diffusion in two-dimensional bimolecular recombination

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