The impact of spiro-OMeTAD photodoping on the reversible light-induced transients of perovskite solar cells

Hole transporting materials (HTMs) play essential roles in facilitating hole extraction and suppressing recombination in lead halide perovskite solar cells (PSCs). High levels of p-doping in HTMs is necessary for achieving high device performance, attributed to an increased electrical conductivity....

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Autores: Tan, Boer, Raga, Sonia, Rietwyk, Kevin James, Lu, Jianfeng, Fürer, Sebastian O.|||0000-0003-3954-4657, Griffith, James C., Cheng, Yi-Bing, Bach, Udo|||0000-0003-2922-4959
Formato: artículo
Fecha de publicación:2021
País:España
Recursos:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:237731
Acesso em linha:https://ddd.uab.cat/record/237731
https://dx.doi.org/urn:doi:10.1016/j.nanoen.2020.105658
Access Level:acceso abierto
Palavra-chave:Spiro-OMeTAD
Impedance spectroscopy
Photodoping
Hole injection barrier
Light Soaking
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spelling The impact of spiro-OMeTAD photodoping on the reversible light-induced transients of perovskite solar cellsTan, BoerRaga, SoniaRietwyk, Kevin JamesLu, JianfengFürer, Sebastian O.|||0000-0003-3954-4657Griffith, James C.Cheng, Yi-BingBach, Udo|||0000-0003-2922-4959Spiro-OMeTADImpedance spectroscopyPhotodopingHole injection barrierLight SoakingHole transporting materials (HTMs) play essential roles in facilitating hole extraction and suppressing recombination in lead halide perovskite solar cells (PSCs). High levels of p-doping in HTMs is necessary for achieving high device performance, attributed to an increased electrical conductivity. In this work, we provide evidences that the poor performance of PSCs with low levels of doping (i.e., 4 mol% spiro-OMeTAD) in spiro-OMeTAD is mainly caused by the presence of a Schottky barrier at the perovskite/spiro-OMeTAD interface, hampering hole injection. Under continuous illumination at open-circuit condition, the barrier gradually diminishes, increasing the PSC power conversion efficiency by 70-fold after 7 h. This process is completely reversible, returning to the initial poor performance after dark storage. We attribute this improvement in performance to a gradual photodoping of spiro-OMeTAD, triggered by the transfer of photogenerated holes and mediated by the slow migration of halide anions from perovskite to compensate the newly formed spiro-OMeTAD. In-situ parallel analyses with impedance spectroscopy (IS) and photoluminescence are employed to gain insights into the charge dynamics along with light soaking. We find that the Schottky barrier resistance overlays with the recombination signal at the high frequency arc of IS, having important implications for the IS data analysis for PSCs. The work elucidates a major mechanism causing the slow efficiency variations during light/dark cycling, commonly observed in PSCs, which complicates the determination of long-term stability. 22021-01-0120212021-01-01Articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/237731https://dx.doi.org/urn:doi:10.1016/j.nanoen.2020.105658reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.https://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:2377312026-06-06T12:50:31Z
dc.title.none.fl_str_mv The impact of spiro-OMeTAD photodoping on the reversible light-induced transients of perovskite solar cells
title The impact of spiro-OMeTAD photodoping on the reversible light-induced transients of perovskite solar cells
spellingShingle The impact of spiro-OMeTAD photodoping on the reversible light-induced transients of perovskite solar cells
Tan, Boer
Spiro-OMeTAD
Impedance spectroscopy
Photodoping
Hole injection barrier
Light Soaking
title_short The impact of spiro-OMeTAD photodoping on the reversible light-induced transients of perovskite solar cells
title_full The impact of spiro-OMeTAD photodoping on the reversible light-induced transients of perovskite solar cells
title_fullStr The impact of spiro-OMeTAD photodoping on the reversible light-induced transients of perovskite solar cells
title_full_unstemmed The impact of spiro-OMeTAD photodoping on the reversible light-induced transients of perovskite solar cells
title_sort The impact of spiro-OMeTAD photodoping on the reversible light-induced transients of perovskite solar cells
dc.creator.none.fl_str_mv Tan, Boer
Raga, Sonia
Rietwyk, Kevin James
Lu, Jianfeng
Fürer, Sebastian O.|||0000-0003-3954-4657
Griffith, James C.
Cheng, Yi-Bing
Bach, Udo|||0000-0003-2922-4959
author Tan, Boer
author_facet Tan, Boer
Raga, Sonia
Rietwyk, Kevin James
Lu, Jianfeng
Fürer, Sebastian O.|||0000-0003-3954-4657
Griffith, James C.
Cheng, Yi-Bing
Bach, Udo|||0000-0003-2922-4959
author_role author
author2 Raga, Sonia
Rietwyk, Kevin James
Lu, Jianfeng
Fürer, Sebastian O.|||0000-0003-3954-4657
Griffith, James C.
Cheng, Yi-Bing
Bach, Udo|||0000-0003-2922-4959
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Spiro-OMeTAD
Impedance spectroscopy
Photodoping
Hole injection barrier
Light Soaking
topic Spiro-OMeTAD
Impedance spectroscopy
Photodoping
Hole injection barrier
Light Soaking
description Hole transporting materials (HTMs) play essential roles in facilitating hole extraction and suppressing recombination in lead halide perovskite solar cells (PSCs). High levels of p-doping in HTMs is necessary for achieving high device performance, attributed to an increased electrical conductivity. In this work, we provide evidences that the poor performance of PSCs with low levels of doping (i.e., 4 mol% spiro-OMeTAD) in spiro-OMeTAD is mainly caused by the presence of a Schottky barrier at the perovskite/spiro-OMeTAD interface, hampering hole injection. Under continuous illumination at open-circuit condition, the barrier gradually diminishes, increasing the PSC power conversion efficiency by 70-fold after 7 h. This process is completely reversible, returning to the initial poor performance after dark storage. We attribute this improvement in performance to a gradual photodoping of spiro-OMeTAD, triggered by the transfer of photogenerated holes and mediated by the slow migration of halide anions from perovskite to compensate the newly formed spiro-OMeTAD. In-situ parallel analyses with impedance spectroscopy (IS) and photoluminescence are employed to gain insights into the charge dynamics along with light soaking. We find that the Schottky barrier resistance overlays with the recombination signal at the high frequency arc of IS, having important implications for the IS data analysis for PSCs. The work elucidates a major mechanism causing the slow efficiency variations during light/dark cycling, commonly observed in PSCs, which complicates the determination of long-term stability.
publishDate 2021
dc.date.none.fl_str_mv 2
2021-01-01
2021
2021-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/237731
https://dx.doi.org/urn:doi:10.1016/j.nanoen.2020.105658
url https://ddd.uab.cat/record/237731
https://dx.doi.org/urn:doi:10.1016/j.nanoen.2020.105658
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
https://creativecommons.org/licenses/by-nc-nd/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
https://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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