Nonradiative decay of singlet excitons in cadmium selenide nanoparticles

dc.contributor.advisorRossky, Peter J.
dc.creatorAnderson, Kevin Daviden
dc.date.accessioned2014-09-23T19:07:59Zen
dc.date.issued2014-08en
dc.date.submittedAugust 2014en
dc.date.updated2014-09-23T19:07:59Zen
dc.descriptiontexten
dc.description.abstractNonradiative decay of excitons is a competing process to Multi-Exciton Generation (MEG) in nanoparticles. Nonradiative decay of single excitons with sufficient energy to generate bi-excitons in Cd₂₀ Se₁₉ and Cd₈₃ Se₈₁ nanoparticles was studied using Tully's Molecular Dynamics with Quantum Transitions (MDQT) method and a CdSe pseudopo- tential. Exciton decay rates increase with increases in nanoparticle temperature and density of lower-lying excitonic states. There did not appear a significant effect of size on energy decay rates. The decay dynamics generally follow a gradual decay with transitions between nearby states. This is punctuated by periodic, short-lived periods of rapid downhill tran- sitions that result in a large proportion of excess exciton energy being transferred to the vibrational motion of the nanoparticle. The time for relaxation to below the 2.0E[subscript g] cutoff was on the order of 1ps.en
dc.description.departmentChemistryen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/2152/26118en
dc.language.isoenen
dc.subjectNonradiative relaxationen
dc.subjectCadmium Selenideen
dc.subjectNonadiabatic dynamicsen
dc.titleNonradiative decay of singlet excitons in cadmium selenide nanoparticlesen
dc.typeThesisen
thesis.degree.departmentChemistryen
thesis.degree.disciplineChemistryen
thesis.degree.grantorThe University of Texas at Austinen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Artsen

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