Multicomponent Chalcogenides

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dc.contributor.advisorAjayan, Pulickel Men_US
dc.creatorSusarla, Sandhyaen_US
dc.date.accessioned2019-08-28T13:46:46Zen_US
dc.date.available2020-06-01T05:01:08Zen_US
dc.date.created2019-12en_US
dc.date.issued2019-08-27en_US
dc.date.submittedDecember 2019en_US
dc.date.updated2019-08-28T13:46:46Zen_US
dc.description.abstractTransition metal dichalcogenides (TMDs), a class of two-dimensional (2D) materials, are proposed to be the next generation materials for optoelectronic, spintronic, and valleytronic devices due to their direct semiconducting bandgap, strong spin-orbit coupling and non-equivalent K points in momentum space. However, pristine TMDs fall short for these purposes due to their fixed band gap and low life times of intrinsic excitons. From a materials design perspective, alloying and heterostructure formation with TMDs are some of viable solutions. The first part of this thesis discusses TMDs design for optoelectronics and valleytronics. For optoelectronic applications, multicomponent alloying is used: different strategies like binary, non-isomorphous quaternary, and isomorphous quaternary alloying have been adopted. For valleytronics, the focus is on tuning the long-lifetime interlayer (IL) excitons present in vertical 2D heterostructures by straining and twisting. The second part of this thesis details the synthesis and emergent properties of a bulk binary chalcogen alloy (S-Se). Combining insulating S and Se results in the formation of a flexible alloy with very high dielectric constant and strength. It is believed that this S-Se alloy could perfectly bridge the gap between conventional brittle ceramics and flexible polymers.en_US
dc.embargo.terms2020-06-01en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationSusarla, Sandhya. "Multicomponent Chalcogenides." (2019) Diss., Rice University. <a href="https://hdl.handle.net/1911/107359">https://hdl.handle.net/1911/107359</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/107359en_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.subjectTMD Alloysen_US
dc.subjecttunable band gapen_US
dc.subjectTMD heterostructureen_US
dc.subjectin-situ Strainingen_US
dc.subjectInterlayer excitonsen_US
dc.subjectSTEM-EELSen_US
dc.subjectChalcogen alloysen_US
dc.titleMulticomponent Chalcogenidesen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentNanotechnologyen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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