Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

You searched for +publisher:"University of North Carolina" +contributor:("Flynn, Cory"). One record found.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


University of North Carolina

1. Flynn, Cory. Understanding the Synthesis, Performance, and Passivation of Metal Oxide Photocathodes.

Degree: Chemistry, 2016, University of North Carolina

Metal oxides are ubiquitous in semiconductor technologies for their ease of synthesis, chemical stability, and tunable optical/electronic properties. These properties are especially important to fabricating efficient photoelectrodes for solar-energy applications. To counter inherent problems in these materials, new strategies were developed and successfully implemented on the widely-utilized p-type semiconductor, NiO. As the size of semiconductor materials shrink, the surface-to-volume ratio increases and surface defects dominate the performance of the materials. Surface defects can alter the optical and electronic characteristics of materials by changing the Fermi level, charge-carrier mobility, and surface reactivity. We first present a strategy to increase the electrical mobility of mesoporous metal oxide electrode materials by optimizing shape morphology. Transitioning from nanospheres to hexagonal nanoplatelets increased the charge-carrier mobility by one order of magnitude. We then employed this improved material with a new vapor-phase deposition method termed targeted atomic deposition (TAD) to selectively passivate defect sites in semiconductor nanomaterials. We demonstrated the capabilities of this passivation method by applying a TAD of aluminum onto NiO. By exploiting a temperature-dependent deposition process, we selectively passivated the highly reactive sites in NiO: oxygen dangling bonds associated with Ni vacancies. The TAD treatment completely passivated all measurable surface defects, optically bleached the material, and significantly improved all photovoltaic performance metrics in dye-sensitized solar cells. The technique was proven to be generic to numerous forms of NiO. While the implementation of TAD of Al was successful, the process involved pulsing two precursors to passivate the material. Ideally, the TAD process should require only a single precursor and continuous exposure. We utilized a continuous flow of diborane to perform a TAD of B onto NiO. The TAD process was successfully implemented in a simplified manner. The treatment moderately increased DSSC performance and proved viability with a different vapor-phase precursor. Advisors/Committee Members: Flynn, Cory, Cahoon, James, Cahoon, James, Schauer, Cynthia, Meyer, Gerald, You, Wei, Dempsey, Jillian.

Subjects/Keywords: College of Arts and Sciences; Department of Chemistry

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Flynn, C. (2016). Understanding the Synthesis, Performance, and Passivation of Metal Oxide Photocathodes. (Thesis). University of North Carolina. Retrieved from https://cdr.lib.unc.edu/record/uuid:d285d936-892a-4bbd-8c71-039aa80ab835

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Flynn, Cory. “Understanding the Synthesis, Performance, and Passivation of Metal Oxide Photocathodes.” 2016. Thesis, University of North Carolina. Accessed November 28, 2020. https://cdr.lib.unc.edu/record/uuid:d285d936-892a-4bbd-8c71-039aa80ab835.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Flynn, Cory. “Understanding the Synthesis, Performance, and Passivation of Metal Oxide Photocathodes.” 2016. Web. 28 Nov 2020.

Vancouver:

Flynn C. Understanding the Synthesis, Performance, and Passivation of Metal Oxide Photocathodes. [Internet] [Thesis]. University of North Carolina; 2016. [cited 2020 Nov 28]. Available from: https://cdr.lib.unc.edu/record/uuid:d285d936-892a-4bbd-8c71-039aa80ab835.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Flynn C. Understanding the Synthesis, Performance, and Passivation of Metal Oxide Photocathodes. [Thesis]. University of North Carolina; 2016. Available from: https://cdr.lib.unc.edu/record/uuid:d285d936-892a-4bbd-8c71-039aa80ab835

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.