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Optical spectroscopy of colloidal CdSe semiconductor nanostructures

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thesis
posted on 2011-06-17, 00:00 authored by Joseph Bruce Herzog
Using high-spatial-resolution time-resolved and temperature-dependent spectroscopy, this dissertation investigates emission properties of CdSe nanowires (NWs) synthesized using solid-liquid-solid (colloidal) growth. Temperature-dependent near- field scanning optical microscopy (NSOM) achieved spatial resolution of ~50 nm and imaged single NWs having wurtzite(WZ)-zincblende(ZB) polytype structure. Temperature-dependent NSOM and micro-photoluminescence (Ì_å_PL) spectra produce s- shape peak emission energy dependence on temperature, which reveal the formation of band-tail states in the NWs due to the variation of the polytype structure along the length of the NW. Time-resolved photoluminescence (TRPL) measures emission decay data that shows type-I band alignment between the WZ-ZB heterojunction due to the spectral dependence of the emission decay: the decay times decrease as the energy decreases. Finally, a robust rate equation model was completed for a single NW that produces theoretical calculations for the measurements.

History

Date Modified

2017-06-02

Defense Date

2011-06-14

Research Director(s)

Doug Hall

Committee Members

Greg Snider Doug Hall Debdeep Jena

Degree

  • Doctor of Philosophy

Degree Level

  • Doctoral Dissertation

Language

  • English

Alternate Identifier

etd-06172011-075105

Publisher

University of Notre Dame

Program Name

  • Electrical Engineering

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