Charge Recombination Suppressed by Destructive Quantum Interference in Heterojunction Materials

Roel Tempelaar; L. Jan Anton Koster; Remco W.A. Havenith; Jasper Knoester; Thomas L.C. Jansen

doi:10.1021/acs.jpclett.5b02580

Charge Recombination Suppressed by Destructive Quantum Interference in Heterojunction Materials

Roel Tempelaar, L. Jan Anton Koster, Remco W.A. Havenith, Jasper Knoester, Thomas L.C. Jansen^*

^*Corresponding author for this work

Chemistry

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

9 Scopus citations

Abstract

We show that charge recombination in ordered heterojunctions depends sensitively on the degree of coherent delocalization of charges at the donor-acceptor interface. Depending on the relative sign of the electron and hole transfer integrals, such delocalization can dramatically suppress recombination through destructive quantum interference. This could explain why measured recombination rates are significantly lower than predictions based on Langevin theory for a variety of organic bulk heterojunctions. Moreover, it opens up a design strategy for photovoltaic devices with enhanced efficiencies through coherently suppressed charge recombination.

Original language	English (US)
Pages (from-to)	198-203
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	7
Issue number	1
DOIs	https://doi.org/10.1021/acs.jpclett.5b02580
State	Published - Jan 7 2016

Keywords

Langevin theory
bimolecular recombination
organic photovoltaics
quantum coherence

ASJC Scopus subject areas

Materials Science(all)
Physical and Theoretical Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1021/acs.jpclett.5b02580

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abstract = "We show that charge recombination in ordered heterojunctions depends sensitively on the degree of coherent delocalization of charges at the donor-acceptor interface. Depending on the relative sign of the electron and hole transfer integrals, such delocalization can dramatically suppress recombination through destructive quantum interference. This could explain why measured recombination rates are significantly lower than predictions based on Langevin theory for a variety of organic bulk heterojunctions. Moreover, it opens up a design strategy for photovoltaic devices with enhanced efficiencies through coherently suppressed charge recombination.",

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AU - Koster, L. Jan Anton

AU - Havenith, Remco W.A.

AU - Knoester, Jasper

AU - Jansen, Thomas L.C.

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N2 - We show that charge recombination in ordered heterojunctions depends sensitively on the degree of coherent delocalization of charges at the donor-acceptor interface. Depending on the relative sign of the electron and hole transfer integrals, such delocalization can dramatically suppress recombination through destructive quantum interference. This could explain why measured recombination rates are significantly lower than predictions based on Langevin theory for a variety of organic bulk heterojunctions. Moreover, it opens up a design strategy for photovoltaic devices with enhanced efficiencies through coherently suppressed charge recombination.

AB - We show that charge recombination in ordered heterojunctions depends sensitively on the degree of coherent delocalization of charges at the donor-acceptor interface. Depending on the relative sign of the electron and hole transfer integrals, such delocalization can dramatically suppress recombination through destructive quantum interference. This could explain why measured recombination rates are significantly lower than predictions based on Langevin theory for a variety of organic bulk heterojunctions. Moreover, it opens up a design strategy for photovoltaic devices with enhanced efficiencies through coherently suppressed charge recombination.

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KW - bimolecular recombination

KW - organic photovoltaics

KW - quantum coherence

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Charge Recombination Suppressed by Destructive Quantum Interference in Heterojunction Materials

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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