Long periodic ripple in a 2D hybrid halide perovskite structure using branched organic spacers

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dc.citation.firstpage12139
dc.citation.issueNumber44
dc.citation.journalTitleChemical Science
dc.citation.lastpage12148
dc.citation.volumeNumber11
dc.contributor.authorHoffman, Justin M.
dc.contributor.authorMalliakas, Christos D.
dc.contributor.authorSidhik, Siraj
dc.contributor.authorHadar, Ido
dc.contributor.authorMcClain, Rebecca
dc.contributor.authorMohite, Aditya D.
dc.contributor.authorKanatzidis, Mercouri G.
dc.date.accessioned2020-12-16T19:47:20Z
dc.date.available2020-12-16T19:47:20Z
dc.date.issued2020
dc.description.abstractTwo-dimensional (2D) halide perovskites have great promise in optoelectronic devices because of their stability and optical tunability, but the subtle effects on the inorganic layer when modifying the organic spacer remain unclear. Here, we introduce two homologous series of Ruddlesden–Popper (RP) structures using the branched isobutylammonium (IBA) and isoamylammonium (IAA) cations with the general formula (RA)2(MA)n−1PbnI3n+1 (RA = IBA, IAA; MA = methylammonium n = 1–4). Surprisingly, the IAA n = 2 member results in the first modulated 2D perovskite structure with a ripple with a periodicity of 50.6 Å occurring in the inorganic slab diagonally to the [101] direction of the basic unit cell. This leads to an increase of Pb–I–Pb angles along the direction of the wave. Generally, both series show larger in-plane bond angles resulting from the additional bulkiness of the spacers compensating for the MA's small size. Larger bond angles have been shown to decrease the bandgap which is seen here with the bulkier IBA leading to both larger in-plane angles and lower bandgaps except for n = 2, in which the modulated structure has a lower bandgap because of its larger Pb–I–Pb angles. Photo-response was tested for the n = 4 compounds and confirmed, signaling their potential use in solar cell devices. We made films using an MACl additive which showed good crystallinity and preferred orientation according to grazing-incidence wide-angle scattering (GIWAXS). As exemplar, the two n = 4 samples were employed in devices with champion efficiencies of 8.22% and 7.32% for IBA and IAA, respectively.
dc.identifier.citationHoffman, Justin M., Malliakas, Christos D., Sidhik, Siraj, et al.. "Long periodic ripple in a 2D hybrid halide perovskite structure using branched organic spacers." <i>Chemical Science,</i> 11, no. 44 (2020) Royal Society of Chemistry: 12139-12148. https://doi.org/10.1039/D0SC04144K.
dc.identifier.digitald0sc04144k
dc.identifier.doihttps://doi.org/10.1039/D0SC04144K
dc.identifier.urihttps://hdl.handle.net/1911/109735
dc.language.isoeng
dc.publisherRoyal Society of Chemistry
dc.rightsThis article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/
dc.titleLong periodic ripple in a 2D hybrid halide perovskite structure using branched organic spacers
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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