Nano-imaging to Determine the Interstitial Nature of Mn(II) Doping in 2D Halide Perovskites

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dc.contributor.advisorMohite, Aditya
dc.creatorTorma, Andrew J
dc.date.accessioned2022-09-23T16:02:14Z
dc.date.available2022-09-23T16:02:14Z
dc.date.created2022-08
dc.date.issued2022-06-14
dc.date.submittedAugust 2022
dc.date.updated2022-09-23T16:02:14Z
dc.description.abstractAndrew Jonathon Torma By performing correlated nanoscale X-ray microscopy, temporally resolved photoluminescence measurements, and magnetic force microscopy on the inorganic 2D perovskite Cs2PbI2Cl2, we show that doping Mn2+ into the structure results in a lattice expansion. The observed lattice expansion contrasts with the predicted contraction expected to arise from the B-site metal substitution, thus implying that Mn2+ does not replace the Pb2+ sites. Photoluminescence and electron paramagnetic resonance measurements confirm the presence of Mn2+ in the lattice, while correlated nano-XRD and X-ray fluorescence track the local strain and chemical composition. Density functional theory calculations predict that Mn2+ atoms reside at the interstitial sites between two octahedra in the triangle formed by one Cl- and two I- atoms, which results in a locally expanded structure. These measurements shed light on the fate of transition metal dopants, local structure, and optical emission when they are doped at dilute concentrations into a wide band-gap semiconductor.
dc.format.mimetypeapplication/pdf
dc.identifier.citationTorma, Andrew J. "Nano-imaging to Determine the Interstitial Nature of Mn(II) Doping in 2D Halide Perovskites." (2022) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/113224">https://hdl.handle.net/1911/113224</a>.
dc.identifier.urihttps://hdl.handle.net/1911/113224
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectPerovskites
dc.subjectCrystal structure
dc.subjectManganese dopant
dc.subjectPhotoluminescence
dc.subjectDensity functional theory
dc.subjectInorganic compounds
dc.subjectDiffraction
dc.titleNano-imaging to Determine the Interstitial Nature of Mn(II) Doping in 2D Halide Perovskites
dc.typeThesis
dc.type.materialText
thesis.degree.departmentApplied Physics
thesis.degree.disciplineEngineering
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science
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