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University of North Carolina

1. Woomer, Adam. FROM VAN DER WAALS TO COULOMBIC HETEROSTRUCTURES: UNDERSTANDING CHARGE TRANSFER IN 2D MATERIALS.

Degree: Chemistry, 2018, University of North Carolina

Innovations in semiconductor technologies, such as transistors, photovoltaics, and light-emitting diodes, require materials with highly designed properties. Zero-dimensional quantum dots and one-dimensional conjugated polymers are ideal building blocks for engineered three-dimensional materials because of their size-dependent quantum-confined optoelectronic properties, however, two-dimensional materials have been largely unexplored. Here I show that reassembled films of 2D semiconductors retain their quantum-confined properties due to turbostratic disorder and interlayer contaminants, yet are still electrically conductive. I designed uniaxially pressure and temperature-dependent van der Pauw conductivity measurements to determine that charge transport proceeds via hopping, with an activation energy expected for nanoparticle systems. In this manner, we can design 3D materials with virtually any optoelectronic propertie with the appropriate choice of 2D material and thickness. I next introduce a new class of materials, called Coulombic heterostructures. As opposed to the familiar van der Waals heterostructures, in which van der Waals forces dominate the interlayer space of stacked 2D materials, Coulombic heterostructures exhibit massive charge transfer and Coulombic forces between layers. These materials take advantage of the ultra-low work function and anionic electron gas of electrenes to form quasi-bonds between adjacent flakes. With interlayer distances smaller than van der Waals bonds yet larger than ionic and covalent bonds, Coloumbic heterostructures fall within the van der Waals gap, a largely unexplored region of materials. I then highlight the exciting new properties that can result from the assembly of Coulombic heterostructures, including superlubricity, defect free doping, formation of electron-donor adducts, and tuning of intercalation voltages for battery applications. Advisors/Committee Members: Woomer, Adam, Warren, Scott, Cahoon, James, You, Wei, Atkin, Joanna, Dingemans, Theo.

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

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

APA (6th Edition):

Woomer, A. (2018). FROM VAN DER WAALS TO COULOMBIC HETEROSTRUCTURES: UNDERSTANDING CHARGE TRANSFER IN 2D MATERIALS. (Thesis). University of North Carolina. Retrieved from https://cdr.lib.unc.edu/record/uuid:77e61e95-69bd-49fd-867b-4543bdfc7705

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):

Woomer, Adam. “FROM VAN DER WAALS TO COULOMBIC HETEROSTRUCTURES: UNDERSTANDING CHARGE TRANSFER IN 2D MATERIALS.” 2018. Thesis, University of North Carolina. Accessed December 01, 2020. https://cdr.lib.unc.edu/record/uuid:77e61e95-69bd-49fd-867b-4543bdfc7705.

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

MLA Handbook (7th Edition):

Woomer, Adam. “FROM VAN DER WAALS TO COULOMBIC HETEROSTRUCTURES: UNDERSTANDING CHARGE TRANSFER IN 2D MATERIALS.” 2018. Web. 01 Dec 2020.

Vancouver:

Woomer A. FROM VAN DER WAALS TO COULOMBIC HETEROSTRUCTURES: UNDERSTANDING CHARGE TRANSFER IN 2D MATERIALS. [Internet] [Thesis]. University of North Carolina; 2018. [cited 2020 Dec 01]. Available from: https://cdr.lib.unc.edu/record/uuid:77e61e95-69bd-49fd-867b-4543bdfc7705.

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

Council of Science Editors:

Woomer A. FROM VAN DER WAALS TO COULOMBIC HETEROSTRUCTURES: UNDERSTANDING CHARGE TRANSFER IN 2D MATERIALS. [Thesis]. University of North Carolina; 2018. Available from: https://cdr.lib.unc.edu/record/uuid:77e61e95-69bd-49fd-867b-4543bdfc7705

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

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