Magnetic field enhancement of organic photovoltaic cells performance

Abstract Charge separation is a critical process for achieving high efficiencies in organic photovoltaic cells. The initial tightly bound excitonic electron-hole pair has to dissociate fast enough in order to avoid photocurrent generation and thus power conversion efficiency loss via geminate recomb...

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Autores principales:	S. Oviedo-Casado, A. Urbina, J. Prior
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c9fe8ddb4db949e791ccd7321e3e3dba
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spelling	oai:doaj.org-article:c9fe8ddb4db949e791ccd7321e3e3dba2021-12-02T11:52:58ZMagnetic field enhancement of organic photovoltaic cells performance10.1038/s41598-017-04621-92045-2322https://doaj.org/article/c9fe8ddb4db949e791ccd7321e3e3dba2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04621-9https://doaj.org/toc/2045-2322Abstract Charge separation is a critical process for achieving high efficiencies in organic photovoltaic cells. The initial tightly bound excitonic electron-hole pair has to dissociate fast enough in order to avoid photocurrent generation and thus power conversion efficiency loss via geminate recombination. Such process takes place assisted by transitional states that lie between the initial exciton and the free charge state. Due to spin conservation rules these intermediate charge transfer states typically have singlet character. Here we propose a donor-acceptor model for a generic organic photovoltaic cell in which the process of charge separation is modulated by a magnetic field which tunes the energy levels. The impact of a magnetic field is to intensify the generation of charge transfer states with triplet character via inter-system crossing. As the ground state of the system has singlet character, triplet states are recombination-protected, thus leading to a higher probability of successful charge separation. Using the open quantum systems formalism we demonstrate that the population of triplet charge transfer states grows in the presence of a magnetic field, and discuss the impact on carrier population and hence photocurrent, highlighting its potential as a tool for research on charge transfer kinetics in this complex systems.S. Oviedo-CasadoA. UrbinaJ. PriorNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q S. Oviedo-Casado A. Urbina J. Prior Magnetic field enhancement of organic photovoltaic cells performance
description	Abstract Charge separation is a critical process for achieving high efficiencies in organic photovoltaic cells. The initial tightly bound excitonic electron-hole pair has to dissociate fast enough in order to avoid photocurrent generation and thus power conversion efficiency loss via geminate recombination. Such process takes place assisted by transitional states that lie between the initial exciton and the free charge state. Due to spin conservation rules these intermediate charge transfer states typically have singlet character. Here we propose a donor-acceptor model for a generic organic photovoltaic cell in which the process of charge separation is modulated by a magnetic field which tunes the energy levels. The impact of a magnetic field is to intensify the generation of charge transfer states with triplet character via inter-system crossing. As the ground state of the system has singlet character, triplet states are recombination-protected, thus leading to a higher probability of successful charge separation. Using the open quantum systems formalism we demonstrate that the population of triplet charge transfer states grows in the presence of a magnetic field, and discuss the impact on carrier population and hence photocurrent, highlighting its potential as a tool for research on charge transfer kinetics in this complex systems.
format	article
author	S. Oviedo-Casado A. Urbina J. Prior
author_facet	S. Oviedo-Casado A. Urbina J. Prior
author_sort	S. Oviedo-Casado
title	Magnetic field enhancement of organic photovoltaic cells performance
title_short	Magnetic field enhancement of organic photovoltaic cells performance
title_full	Magnetic field enhancement of organic photovoltaic cells performance
title_fullStr	Magnetic field enhancement of organic photovoltaic cells performance
title_full_unstemmed	Magnetic field enhancement of organic photovoltaic cells performance
title_sort	magnetic field enhancement of organic photovoltaic cells performance
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/c9fe8ddb4db949e791ccd7321e3e3dba
work_keys_str_mv	AT soviedocasado magneticfieldenhancementoforganicphotovoltaiccellsperformance AT aurbina magneticfieldenhancementoforganicphotovoltaiccellsperformance AT jprior magneticfieldenhancementoforganicphotovoltaiccellsperformance
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Magnetic field enhancement of organic photovoltaic cells performance

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