Topologically protected photovoltaics in Bi nanoribbons

Photovoltaic efficiency in solar cells is hindered bymany unwanted effects. Radiative channels (emission of photons)sometimes mediated by nonradiative ones (emission of phonons)are principally responsible for the decrease in exciton populationbefore charge separation can take place. One such mechani...

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Detalhes bibliográficos
Autores: Uría Álvarez, Alejandro José, Palacios Burgos, Juan José
Formato: artículo
Fecha de publicación:2024
País:España
Recursos:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/713012
Acesso em linha:http://hdl.handle.net/10486/713012
https://dx.doi.org/10.1021/acs.nanolett.4c01277
Access Level:acceso abierto
Palavra-chave:Photovoltaics
Topological insulator
Exciton
Optics
Two-Dimensional Materials
Física
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spelling Topologically protected photovoltaics in Bi nanoribbonsUría Álvarez, Alejandro JoséPalacios Burgos, Juan JoséPhotovoltaicsTopological insulatorExcitonOpticsTwo-Dimensional MaterialsFísicaPhotovoltaic efficiency in solar cells is hindered bymany unwanted effects. Radiative channels (emission of photons)sometimes mediated by nonradiative ones (emission of phonons)are principally responsible for the decrease in exciton populationbefore charge separation can take place. One such mechanism iselectron−hole recombination at surfaces or defects where the in-gap edge states serve as the nonradiative channels. In topologicalinsulators (TIs), which are rarely explored from an optoelectronicsstandpoint, we show that their characteristic surface statesconstitute a nonradiative decay channel that can be exploited togenerate a protected photovoltaic current. Focusing on two-dimensional TIs, and specifically for illustration purposes on aBi(111) monolayer, we obtain the transition rates from the bulkexcitons to the edge states. By breaking the appropriate symmetries of the system, one can induce an edge charge accumulation andedge currents under illumination, demonstrating the potential of TI nanoribbons for photovoltaicsThe authors acknowledge financial support from the Spanish MICINN (grant nos. PID2019-109539GB-C43, TED2021131323B-I00, and PID2022-141712NB-C21), the María de Maeztu Program for Units of Excellence in R&D (grant no. CEX2018-000805-M), Comunidad Autónoma de Madrid through the Nanomag COST-CM Program (grant no. S2018/NMT-4321), Generalitat Valenciana through Programa Prometeo (2021/017)American Chemical SocietyDepartamento de Física de la Materia CondensadaFacultad de Ciencias20242024-05-28research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/713012https://dx.doi.org/10.1021/acs.nanolett.4c01277reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/7130122026-06-23T12:46:27Z
dc.title.none.fl_str_mv Topologically protected photovoltaics in Bi nanoribbons
title Topologically protected photovoltaics in Bi nanoribbons
spellingShingle Topologically protected photovoltaics in Bi nanoribbons
Uría Álvarez, Alejandro José
Photovoltaics
Topological insulator
Exciton
Optics
Two-Dimensional Materials
Física
title_short Topologically protected photovoltaics in Bi nanoribbons
title_full Topologically protected photovoltaics in Bi nanoribbons
title_fullStr Topologically protected photovoltaics in Bi nanoribbons
title_full_unstemmed Topologically protected photovoltaics in Bi nanoribbons
title_sort Topologically protected photovoltaics in Bi nanoribbons
dc.creator.none.fl_str_mv Uría Álvarez, Alejandro José
Palacios Burgos, Juan José
author Uría Álvarez, Alejandro José
author_facet Uría Álvarez, Alejandro José
Palacios Burgos, Juan José
author_role author
author2 Palacios Burgos, Juan José
author2_role author
dc.contributor.none.fl_str_mv Departamento de Física de la Materia Condensada
Facultad de Ciencias
dc.subject.none.fl_str_mv Photovoltaics
Topological insulator
Exciton
Optics
Two-Dimensional Materials
Física
topic Photovoltaics
Topological insulator
Exciton
Optics
Two-Dimensional Materials
Física
description Photovoltaic efficiency in solar cells is hindered bymany unwanted effects. Radiative channels (emission of photons)sometimes mediated by nonradiative ones (emission of phonons)are principally responsible for the decrease in exciton populationbefore charge separation can take place. One such mechanism iselectron−hole recombination at surfaces or defects where the in-gap edge states serve as the nonradiative channels. In topologicalinsulators (TIs), which are rarely explored from an optoelectronicsstandpoint, we show that their characteristic surface statesconstitute a nonradiative decay channel that can be exploited togenerate a protected photovoltaic current. Focusing on two-dimensional TIs, and specifically for illustration purposes on aBi(111) monolayer, we obtain the transition rates from the bulkexcitons to the edge states. By breaking the appropriate symmetries of the system, one can induce an edge charge accumulation andedge currents under illumination, demonstrating the potential of TI nanoribbons for photovoltaics
publishDate 2024
dc.date.none.fl_str_mv 2024
2024-05-28
dc.type.none.fl_str_mv research article
http://purl.org/coar/resource_type/c_2df8fbb1
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/713012
https://dx.doi.org/10.1021/acs.nanolett.4c01277
url http://hdl.handle.net/10486/713012
https://dx.doi.org/10.1021/acs.nanolett.4c01277
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Chemical Society
publisher.none.fl_str_mv American Chemical Society
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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