How Humidity and Light Exposure Change the Photophysics of Metal Halide Perovskite Solar Cells

Esma Ugur; Erkki Alarousu; Jafar I. Khan; Aleš Vlk; Erkan Aydin; Michele De Bastiani; Ahmed H. Balawi; Sandra P. Gonzalez Lopez; Martin Ledinský; Stefaan De Wolf; Frédéric Laquai

doi:10.1002/solr.202000382

How Humidity and Light Exposure Change the Photophysics of Metal Halide Perovskite Solar Cells

Esma Ugur^*, Erkki Alarousu, Jafar I. Khan, Aleš Vlk, Erkan Aydin, Michele De Bastiani, Ahmed H. Balawi, Sandra P. Gonzalez Lopez, Martin Ledinský, Stefaan De Wolf, Frédéric Laquai^*

^*Corresponding author for this work

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

25 Scopus citations

Abstract

Metal halide perovskites exhibit outstanding optical and electronic properties, but are very sensitive to humidity and light-soaking. In this work, the photophysics of perovskites that have been exposed to such conditions are studied and, in this context, the impact of excess lead iodide (PbI₂) is revealed. For exposed samples, the formation of subbandgap states and increased trap-assisted recombination is observed, using highly sensitive absorption and time-resolved photoluminescence (TRPL) measurements, respectively. It appears that such exposure primarily affects the perovskite surface. Consequently, on n–i–p device level, the spiro-OMeTAD/perovskite interface is more rapidly affected than its buried electron-collecting interface. Moreover, both stoichiometric and nonstoichiometric MAPbI₃-based solar cells show reduced device performance mainly due to voltage losses. Overall, this study brings forward key points to consider in engineering perovskite solar cells with improved performance and material stability.

Original language	English (US)
Journal	Solar RRL
DOIs	https://doi.org/10.1002/solr.202000382
State	Accepted/In press - 2020

Bibliographical note

Funding Information:
This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No.: OSR‐2018‐CARF/CCF‐3079. E.U. and F.L. thank K. Vandewal and M. Baier for contributing to the setup for photothermal deflection spectroscopy (PDS). M.L. and A.V. acknowledge the support of Czech Science Foundation Project No. 17‐26041Y, Operational Programme Research, Development, and Education financed by the European Structural and Investment Funds and the Czech Ministry of Education, Youth and Sports (Project No. CZ.02.1.01/0.0/0.0/16_019/0000760 – SOLID21) and CzechNanoLab Research Infrastructure supported by MEYS CR (LM2018110).

Publisher Copyright:
© 2020 Wiley-VCH GmbH

Keywords

metal halide perovskites
perovskite photophysics
perovskite solar cells
photodegradation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1002/solr.202000382

Cite this

@article{6b230c89bb654013aadc81835ccaa861,

title = "How Humidity and Light Exposure Change the Photophysics of Metal Halide Perovskite Solar Cells",

abstract = "Metal halide perovskites exhibit outstanding optical and electronic properties, but are very sensitive to humidity and light-soaking. In this work, the photophysics of perovskites that have been exposed to such conditions are studied and, in this context, the impact of excess lead iodide (PbI2) is revealed. For exposed samples, the formation of subbandgap states and increased trap-assisted recombination is observed, using highly sensitive absorption and time-resolved photoluminescence (TRPL) measurements, respectively. It appears that such exposure primarily affects the perovskite surface. Consequently, on n–i–p device level, the spiro-OMeTAD/perovskite interface is more rapidly affected than its buried electron-collecting interface. Moreover, both stoichiometric and nonstoichiometric MAPbI3-based solar cells show reduced device performance mainly due to voltage losses. Overall, this study brings forward key points to consider in engineering perovskite solar cells with improved performance and material stability.",

keywords = "metal halide perovskites, perovskite photophysics, perovskite solar cells, photodegradation",

author = "Esma Ugur and Erkki Alarousu and Khan, {Jafar I.} and Ale{\v s} Vlk and Erkan Aydin and {De Bastiani}, Michele and Balawi, {Ahmed H.} and {Gonzalez Lopez}, {Sandra P.} and Martin Ledinsk{\'y} and {De Wolf}, Stefaan and Fr{\'e}d{\'e}ric Laquai",

note = "Funding Information: This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No.: OSR‐2018‐CARF/CCF‐3079. E.U. and F.L. thank K. Vandewal and M. Baier for contributing to the setup for photothermal deflection spectroscopy (PDS). M.L. and A.V. acknowledge the support of Czech Science Foundation Project No. 17‐26041Y, Operational Programme Research, Development, and Education financed by the European Structural and Investment Funds and the Czech Ministry of Education, Youth and Sports (Project No. CZ.02.1.01/0.0/0.0/16_019/0000760 – SOLID21) and CzechNanoLab Research Infrastructure supported by MEYS CR (LM2018110). Publisher Copyright: {\textcopyright} 2020 Wiley-VCH GmbH",

year = "2020",

doi = "10.1002/solr.202000382",

language = "English (US)",

journal = "Solar RRL",

issn = "2367-198X",

publisher = "Wiley-VCH Verlag",

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T1 - How Humidity and Light Exposure Change the Photophysics of Metal Halide Perovskite Solar Cells

AU - Ugur, Esma

AU - Alarousu, Erkki

AU - Khan, Jafar I.

AU - Vlk, Aleš

AU - Aydin, Erkan

AU - De Bastiani, Michele

AU - Balawi, Ahmed H.

AU - Gonzalez Lopez, Sandra P.

AU - Ledinský, Martin

AU - De Wolf, Stefaan

AU - Laquai, Frédéric

N1 - Funding Information: This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No.: OSR‐2018‐CARF/CCF‐3079. E.U. and F.L. thank K. Vandewal and M. Baier for contributing to the setup for photothermal deflection spectroscopy (PDS). M.L. and A.V. acknowledge the support of Czech Science Foundation Project No. 17‐26041Y, Operational Programme Research, Development, and Education financed by the European Structural and Investment Funds and the Czech Ministry of Education, Youth and Sports (Project No. CZ.02.1.01/0.0/0.0/16_019/0000760 – SOLID21) and CzechNanoLab Research Infrastructure supported by MEYS CR (LM2018110). Publisher Copyright: © 2020 Wiley-VCH GmbH

PY - 2020

Y1 - 2020

N2 - Metal halide perovskites exhibit outstanding optical and electronic properties, but are very sensitive to humidity and light-soaking. In this work, the photophysics of perovskites that have been exposed to such conditions are studied and, in this context, the impact of excess lead iodide (PbI2) is revealed. For exposed samples, the formation of subbandgap states and increased trap-assisted recombination is observed, using highly sensitive absorption and time-resolved photoluminescence (TRPL) measurements, respectively. It appears that such exposure primarily affects the perovskite surface. Consequently, on n–i–p device level, the spiro-OMeTAD/perovskite interface is more rapidly affected than its buried electron-collecting interface. Moreover, both stoichiometric and nonstoichiometric MAPbI3-based solar cells show reduced device performance mainly due to voltage losses. Overall, this study brings forward key points to consider in engineering perovskite solar cells with improved performance and material stability.

AB - Metal halide perovskites exhibit outstanding optical and electronic properties, but are very sensitive to humidity and light-soaking. In this work, the photophysics of perovskites that have been exposed to such conditions are studied and, in this context, the impact of excess lead iodide (PbI2) is revealed. For exposed samples, the formation of subbandgap states and increased trap-assisted recombination is observed, using highly sensitive absorption and time-resolved photoluminescence (TRPL) measurements, respectively. It appears that such exposure primarily affects the perovskite surface. Consequently, on n–i–p device level, the spiro-OMeTAD/perovskite interface is more rapidly affected than its buried electron-collecting interface. Moreover, both stoichiometric and nonstoichiometric MAPbI3-based solar cells show reduced device performance mainly due to voltage losses. Overall, this study brings forward key points to consider in engineering perovskite solar cells with improved performance and material stability.

KW - metal halide perovskites

KW - perovskite photophysics

KW - perovskite solar cells

KW - photodegradation

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DO - 10.1002/solr.202000382

M3 - Article

AN - SCOPUS:85091381917

SN - 2367-198X

JO - Solar RRL

JF - Solar RRL

ER -

How Humidity and Light Exposure Change the Photophysics of Metal Halide Perovskite Solar Cells

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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