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The Complex Degradation Mechanism of Copper Electrodes on Lead Halide Perovskites
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Condensed Matter Physics of Energy Materials.ORCID iD: 0000-0001-7351-8183
KTH Royal Inst Technol, Dept Chem, Div Appl Phys Chem, SE-10044 Stockholm, Sweden.ORCID iD: 0000-0003-1671-9979
Helmholtz Zentrum Berlin Mat & Energie GmbH, Young Investigator Grp Hybrid Mat Format & Scalin, D-12489 Berlin, Germany..ORCID iD: 0000-0002-4317-2879
Uppsala Berlin Joint Lab Next Generat Photoelectr, D-12489 Berlin, Germany..
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2022 (English)In: ACS Materials Science Au, E-ISSN 2694-2461, Vol. 2, no 3, p. 301-312Article in journal (Refereed) Published
Abstract [en]

Lead halide perovskitesolar cells have reached power conversionefficiencies during the past few years that rival those of crystallinesilicon solar cells, and there is a concentrated effort to commercializethem. The use of gold electrodes, the current standard, is prohibitivelycostly for commercial application. Copper is a promising low-costelectrode material that has shown good stability in perovskite solarcells with selective contacts. Furthermore, it has the potential tobe self-passivating through the formation of CuI, a copper salt whichis also used as a hole selective material. Based on these opportunities,we investigated the interface reactions between lead halide perovskitesand copper in this work. Specifically, copper was deposited on theperovskite surface, and the reactions were followed in detail usingsynchrotron-based and in-house photoelectron spectroscopy. The resultsshow a rich interfacial chemistry with reactions starting upon depositionand, with the exposure to oxygen and moisture, progress over manyweeks, resulting in significant degradation of both the copper andthe perovskite. The degradation results not only in the formationof CuI, as expected, but also in the formation of two previously unreporteddegradation products. The hope is that a deeper understanding of theseprocesses will aid in the design of corrosion-resistant copper-basedelectrodes.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2022. Vol. 2, no 3, p. 301-312
Keywords [en]
perovskite solar cell, X-ray photoelectronspectroscopy, stability, back contact, metal, interfacechemistry
National Category
Materials Chemistry Physical Chemistry Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-511718DOI: 10.1021/acsmaterialsau.1c00038ISI: 001041708800001PubMedID: 35578703OAI: oai:DiVA.org:uu-511718DiVA, id: diva2:1800588
Funder
VinnovaSwedish Research Council FormasSwedish Research Council, RMA15-0130Swedish Research Council, 2018-04969Swedish Research Council, 2019-02496Swedish Research Council, 2018-07152Swedish Foundation for Strategic Research, P43549-1Swedish Energy AgencyAvailable from: 2023-09-27 Created: 2023-09-27 Last updated: 2024-06-11Bibliographically approved

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Svanström, SebastianGarcía-Fernández, AlbertoJacobsson, T. JesperSloboda, TamaraMan, GabrielBoschloo, GerritJohansson, Erik M. J.Rensmo, HåkanCappel, Ute B.
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