Understanding the structural properties in two-dimensional halide perovskites under external stimuli

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dc.contributor.advisorMohite, Aditya D.en_US
dc.contributor.committeeMemberKono, Junichiroen_US
dc.contributor.committeeMemberWehmeyer, Geoffen_US
dc.creatorLi, Wenbinen_US
dc.date.accessioned2021-08-27T18:45:53Zen_US
dc.date.available2022-02-01T06:01:12Zen_US
dc.date.created2021-08en_US
dc.date.issued2021-08-23en_US
dc.date.submittedAugust 2021en_US
dc.date.updated2021-08-27T18:45:54Zen_US
dc.description.abstractUnderstanding the structural and electrical behaviors of organic-inorganic (hybrid) halide perovskites under practical environments is critical for building an efficient and stable optoelectronic device. In this thesis, we report a light-activated interlayer contraction in 2D hybrid halide perovskite. This effect is reversible and is strongly dependent on the structural phase and interlayer distance. X-ray photoelectron spectroscopy and density function theory simulation suggest that photogenerated hole carriers are accumulating at the inter-slab iodide atoms which results in the enhancement of interlayer I---I interactions across the organic barrier. In-situ structural (device) and transport (space charge limited current-SCLC) measurements directly correlate the light-induced interlayer contraction to the onset of a three-fold increase in carrier mobility and conductivity. Furthermore, light intensity dependent SCLC measurement reveals a percolation based mechanism for the enhancement of the charge transport. The increase in transport properties boost the photovoltaic efficiency of Dion-Jacobson 2D n=4 perovskite solar cells from 15.6% to 18.3%.en_US
dc.embargo.terms2022-02-01en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationLi, Wenbin. "Understanding the structural properties in two-dimensional halide perovskites under external stimuli." (2021) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/111341">https://hdl.handle.net/1911/111341</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/111341en_US
dc.language.isoengen_US
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.en_US
dc.subjectPerovskiteen_US
dc.subjectoptoelectronic devicesen_US
dc.subjectexternal perturbationen_US
dc.subjectgrazing incident wide angle X-ray scatteringen_US
dc.titleUnderstanding the structural properties in two-dimensional halide perovskites under external stimulien_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentApplied Physicsen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.majorMaterials Physicsen_US
thesis.degree.nameMaster of Scienceen_US
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