Hybrid Perovskite Degradation from an Optical Perspective: A Spectroscopic Ellipsometry Study from the Deep Ultraviolet to the Middle Infrared

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dc.contributor.affiliationPontificia Universidad Católica del Perú. Departamento de Química
dc.contributor.authorTejada, A.
dc.contributor.authorPeters, S.
dc.contributor.authorAl-Ashouri, A.
dc.contributor.authorTurren-Cruz, S.H.
dc.contributor.authorAbate, A.
dc.contributor.authorAlbrecht, S.
dc.contributor.authorRuske, F.
dc.contributor.authorRech, B.
dc.contributor.authorGuerra Torres, J.A.
dc.contributor.authorKorte, L.
dc.date.accessioned2026-03-13T16:57:27Z
dc.date.issued2022
dc.description.abstractA quantitative analysis of the thermally induced degradation of various device-relevant multi-cation hybrid perovskite films is performed using spectroscopic ellipsometry, for temperatures between 80 and 120 °C. The studied compositions are a triple cation perovskite Cs₀.₀₅(MA₀.₁₇FA₀.₈₃)₀.₉₅Pb(Br₀.₁₇I₀.₈₃)₃, a Rb-containing variant Rb₀.₀₅Cs₀.₀₅(MA₀.₁₇FA₀.₈₃)₀.₉₀Pb(Br₀.₁₇I₀.₈₃)₃, and a methylammonium-free Rb₀.₀₅Cs₀.₁₀FA₀.₈₅PbI₃ composition. A very wide combined spectral range of 200 nm to 25 μm is covered by combining the data from two separate instruments. The relative changes in organic cation concentrations are quantified from the middle infrared molecular absorption bands, leveraging the use of point-by-point fitting for increased sensitivity. Additionally, the formation of PbI₂ and non-perovskite δ-CsPbI₃ phases is evidenced from Bruggemann effective medium fits to the visible and ultraviolet complex refractive indices. Methylammonium is almost completely depleted from the relevant compositions within 100 to 285 min of thermal annealing. The MA-free perovskite degrades faster at intermediate temperatures, which is attributed to phase instability due to the formation of δ-CsPbI₃ in addition to PbI₂.en_US
dc.description.sponsorshipFunding: This work was partially funded by the German Federal Ministry for Education and Research (BMBF, grant 03SF0540), the HyperCells Graduate School, and the Helmholtz Association within the HySPRINT Innovation lab project and TAPAS project. Additional funding was provided by the Peruvian National Fund for Scientific and Technological Development (FONDECYT, grant 179-2020-FONDECYT), the German Academic Exchange Service (DAAD) in conjunction with FONDECYT (grants 57508544 and 423-2019-FONDECYT, respectively), as well as by the PUCP vicechancellorship for research (VRI, project CAP-2019-3-0041/702). The authors gratefully acknowledge Bor Li and Hampus Näsström for their aid in sample manufacturing, Marcel Roß for the XRD measurements and sample preparation, Ganna Chistiakova for additional ellipsometry measurements, Anna Morales for the ITO deposition, as well as Carola Ferber, Monika Gabernig, and Hagen Heinz in the HySPRINT lab. A.T. gratefully acknowledges the Peruvian National Council for Science, Technology and Technological Innovation (CONCYTEC) for a Ph.D. scholarship under grant no. 236-2015-FONDECYT. Open access funding enabled and organized by Projekt DEAL.; Funding text 2: This work was partially funded by the German Federal Ministry for Education and Research (BMBF, grant 03SF0540), the HyperCells Graduate School, and the Helmholtz Association within the HySPRINT Innovation lab project and TAPAS project. Additional funding was provided by the Peruvian National Fund for Scientific and Technological Development (FONDECYT, grant 179‐2020‐FONDECYT), the German Academic Exchange Service (DAAD) in conjunction with FONDECYT (grants 57508544 and 423‐2019‐FONDECYT, respectively), as well as by the PUCP vicechancellorship for research (VRI, project CAP‐2019‐3‐0041/702). The authors gratefully acknowledge Bor Li and Hampus Näsström for their aid in sample manufacturing, Marcel Roß for the XRD measurements and sample preparation, Ganna Chistiakova for additional ellipsometry measurements, Anna Morales for the ITO deposition, as well as Carola Ferber, Monika Gabernig, and Hagen Heinz in the HySPRINT lab. A.T. gratefully acknowledges the Peruvian National Council for Science, Technology and Technological Innovation (CONCYTEC) for a Ph.D. scholarship under grant no. 236‐2015‐FONDECYT.
dc.identifier.doihttps://doi.org/10.1002/adom.202101553
dc.identifier.urihttp://hdl.handle.net/20.500.14657/205547
dc.language.isoeng
dc.publisherJohn Wiley and Sons
dc.relation.ispartofurn:issn:2195-1071
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.sourceAdvanced Optical Materials; Vol. 10, Núm. 3 (2022)
dc.subjectMaterials science
dc.subjectEllipsometry
dc.subjectPerovskite (structure)
dc.subjectUltraviolet
dc.subjectInfrared
dc.subjectAnalytical Chemistry (journal)
dc.subjectAnnealing (glass)
dc.subjectInfrared spectroscopy
dc.subjectThin film
dc.subjectOptics
dc.subjectNanotechnology
dc.subjectCrystallography
dc.subjectOptoelectronics
dc.subjectChemistry
dc.subjectOrganic chemistry
dc.subject.ocdehttps://purl.org/pe-repo/ocde/ford#1.04.00
dc.titleHybrid Perovskite Degradation from an Optical Perspective: A Spectroscopic Ellipsometry Study from the Deep Ultraviolet to the Middle Infrared
dc.typehttp://purl.org/coar/resource_type/c_6501
dc.type.otherArtículo
dc.type.versionhttps://vocabularies.coar-repositories.org/version_types/c_970fb48d4fbd8a85/

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