Hidden polymorphism of FAPbI3 discovered by Raman spectroscopy

dc.contributor.authorIbaceta-Jaña, Josefa
dc.contributor.authorMuydinov, Ruslan
dc.contributor.authorRosado, Pamela
dc.contributor.authorVinoth Kumar, Sri Hari Bharath
dc.contributor.authorGunder, Rene
dc.contributor.authorHoffmann, Axel
dc.contributor.authorSzyszka, Bernd
dc.contributor.authorWagner, Markus. R.
dc.date.accessioned2021-11-22T07:47:55Z
dc.date.available2021-11-22T07:47:55Z
dc.date.issued2021-04-12
dc.description.abstractFormamidinium lead iodide (FAPbI3) can be used in its cubic, black form as a light absorber material in single-junction solar cells. It has a band-gap (1.5 eV) close to the maximum of the Shockley–Queisser limit, and reveals a high absorption coefficient. Its high thermal stability up to 320 °C has also a downside, which is the instability of the photo-active form at room temperature (RT). Thus, the black α-phase transforms at RT with time into a yellow non-photo-active δ-phase. The black phase can be recovered by annealing of the yellow state. In this work, a polymorphism of the α-phase at room temperature was found: as-synthesized (αi), degraded (αδ) and thermally recovered (αrec). They differ in the Raman spectra and PL signal, but not in the XRD patterns. Using temperature-dependent Raman spectroscopy, we identified a structural change in the αi-polymorph at ca. 110 °C. Above 110 °C, the FAPbI3 structure has undoubtedly cubic Pm[3 with combining macron]m symmetry (high-temperature phase: αHT). Below that temperature, the αi-phase was suggested to have a distorted perovskite structure with Im[3 with combining macron] symmetry. Thermally recovered FAPbI3 (αrec) also demonstrated the structural transition to αHT at the same temperature (ca. 110 °C) during its heating. The understanding of hybrid perovskites may bring additional assets in the development of new and stable structures.en
dc.description.sponsorshipBMWi, 0324095H, Verbundvorhaben: speedCIGS - Rechnerunterstützte Optimierung des CIGS-Depositionsprozesses in der industriellen Umsetzung; Teilvorhaben: Transparent leitende Schichten und Perowskit Absorber Schichten für Tandem Konzepte mit CIGS Absorberen
dc.description.sponsorshipTU Berlin, Open-Access-Mittel – 2021en
dc.identifier.eissn1463-9084
dc.identifier.issn1463-9076
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/13938
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-12712
dc.language.isoen
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/en
dc.subject.ddc540 Chemie und zugeordnete Wissenschaftenen
dc.subject.otherFormamidinium lead iodideen
dc.subject.otherRaman spectroscopyen
dc.subject.otherhybrid perovskitesen
dc.titleHidden polymorphism of FAPbI3 discovered by Raman spectroscopyen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1039/D1CP00102G
dcterms.bibliographicCitation.issue15
dcterms.bibliographicCitation.journaltitlePhysical Chemistry, Chemical Physicsen
dcterms.bibliographicCitation.originalpublishernameRoyal Society of Chemistry (RSC)en
dcterms.bibliographicCitation.originalpublisherplaceLondonen
dcterms.bibliographicCitation.pageend9482
dcterms.bibliographicCitation.pagestart9476
dcterms.bibliographicCitation.volume23
tub.accessrights.dnbfreeen
tub.affiliationFak. 2 Mathematik und Naturwissenschaften::Inst. Festkörperphysik::AG Halbleiter Nanophononik und Nanophotonikde
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.groupAG Halbleiter Nanophononik und Nanophotonikde
tub.affiliation.instituteInst. Festkörperphysikde
tub.publisher.universityorinstitutionTechnische Universität Berlinen

Files

Original bundle
Now showing 1 - 1 of 1
Loading…
Thumbnail Image
Name:
ibaceta-jana_etal_2021.pdf
Size:
2.81 MB
Format:
Adobe Portable Document Format

Collections