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    Tuning Size and Light Emission Characteristics of CdSes/ZnS Alloyed Core-Shell Quantum Dots By Alcohol

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    Date
    2019-05-01
    Author
    Marnocha, John Casey
    Department
    Engineering
    Advisor(s)
    Nikolai Kouklin
    Metadata
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    Abstract
    In this thesis, a one-step isotropic down-tuning of the size of alloyed CdSe1−xSx/ZnS core- shell quantum dots is developed by vapor and liquid-phase etching using a ∼ 10 : 1 isopropyl alcohol to water solution. The results of spectroscopic studies confirm continuous variation of the excitonic emission color from red to green for samples treated for up to 15 mins using a vapor-based method. According to HRTEM characterizations, the shift is consistent with a diameter reduction of quantum dots that proceeds at the average rate of ∼ 1.3 ̊A/min. The emission intensity while seen to undergo an initial drop due to the shell removal, was to found to remain largely unchanged with increased treatment durations. The study presents a technologically viable alternative to adjusting the size and, in turn, the optoelectronic characteristics of core-shell quantum dots and nanocrystals in II-VI semiconductor systems.
    Subject
    alcohol
    CdSeS
    colloidal
    etching
    optoelectronic
    quantum dots
    Permanent Link
    http://digital.library.wisc.edu/1793/92142
    Type
    thesis
    Part of
    • UW Milwaukee Electronic Theses and Dissertations

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