Effect of hyperfine interactions on exciton formation in organic semiconductors

S.P. Kersten; A.J. Schellekens; B. Koopmans; P.A. Bobbert

doi:10.1016/j.synthmet.2010.11.040

Effect of hyperfine interactions on exciton formation in organic semiconductors

S.P. Kersten, A.J. Schellekens, B. Koopmans, P.A. Bobbert

Research output: Contribution to journal › Article › Academic › peer-review

5 Citations (Scopus)

Abstract

Abstract: It is still an open question whether the statistical ratio of 1:3 for the formation of singlet vs. triplet excitons in organic semiconductors can be violated. In this work, we use a two-site and a multi-site model to investigate this problem. We show that spin mixing by hyperfine fields leads to a violation of the statistical ratio if singlet and triplet excitons are formed with a different rate. This only occurs if the exciton formation rate is slow enough compared to the hyperfine precession frequency. The violation of the statistical ratio can be suppressed by applying an external magnetic field. In the multi-site model we demonstrate how disorder and Coulomb interactions affect the fraction of singlet excitons formed. © 2010 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	613-616
Journal	Synthetic Metals
Volume	161
Issue number	7-8
DOIs	https://doi.org/10.1016/j.synthmet.2010.11.040
Publication status	Published - 2011

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10.1016/j.synthmet.2010.11.040

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title = "Effect of hyperfine interactions on exciton formation in organic semiconductors",

abstract = "Abstract: It is still an open question whether the statistical ratio of 1:3 for the formation of singlet vs. triplet excitons in organic semiconductors can be violated. In this work, we use a two-site and a multi-site model to investigate this problem. We show that spin mixing by hyperfine fields leads to a violation of the statistical ratio if singlet and triplet excitons are formed with a different rate. This only occurs if the exciton formation rate is slow enough compared to the hyperfine precession frequency. The violation of the statistical ratio can be suppressed by applying an external magnetic field. In the multi-site model we demonstrate how disorder and Coulomb interactions affect the fraction of singlet excitons formed. {\textcopyright} 2010 Elsevier B.V. All rights reserved.",

author = "S.P. Kersten and A.J. Schellekens and B. Koopmans and P.A. Bobbert",

year = "2011",

doi = "10.1016/j.synthmet.2010.11.040",

language = "English",

volume = "161",

pages = "613--616",

journal = "Synthetic Metals",

issn = "0379-6779",

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TY - JOUR

T1 - Effect of hyperfine interactions on exciton formation in organic semiconductors

AU - Kersten, S.P.

AU - Schellekens, A.J.

AU - Koopmans, B.

AU - Bobbert, P.A.

PY - 2011

Y1 - 2011

N2 - Abstract: It is still an open question whether the statistical ratio of 1:3 for the formation of singlet vs. triplet excitons in organic semiconductors can be violated. In this work, we use a two-site and a multi-site model to investigate this problem. We show that spin mixing by hyperfine fields leads to a violation of the statistical ratio if singlet and triplet excitons are formed with a different rate. This only occurs if the exciton formation rate is slow enough compared to the hyperfine precession frequency. The violation of the statistical ratio can be suppressed by applying an external magnetic field. In the multi-site model we demonstrate how disorder and Coulomb interactions affect the fraction of singlet excitons formed. © 2010 Elsevier B.V. All rights reserved.

AB - Abstract: It is still an open question whether the statistical ratio of 1:3 for the formation of singlet vs. triplet excitons in organic semiconductors can be violated. In this work, we use a two-site and a multi-site model to investigate this problem. We show that spin mixing by hyperfine fields leads to a violation of the statistical ratio if singlet and triplet excitons are formed with a different rate. This only occurs if the exciton formation rate is slow enough compared to the hyperfine precession frequency. The violation of the statistical ratio can be suppressed by applying an external magnetic field. In the multi-site model we demonstrate how disorder and Coulomb interactions affect the fraction of singlet excitons formed. © 2010 Elsevier B.V. All rights reserved.

U2 - 10.1016/j.synthmet.2010.11.040

DO - 10.1016/j.synthmet.2010.11.040

M3 - Article

SN - 0379-6779

VL - 161

SP - 613

EP - 616

JO - Synthetic Metals

JF - Synthetic Metals

IS - 7-8

ER -

Effect of hyperfine interactions on exciton formation in organic semiconductors

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