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Synthesis and Characterization of Crystalline Transition Metal Dichalcogenides onto Stretchable Substrates by Laser Processing

Shelton, Travis Edward
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1450405970

Abstract Details

2015, Master of Science (M.S.), University of Dayton, Materials Engineering.
Transistion metal dichalcogenides (TMDs) are an emerging class of materials for thin film transistors (TFTs). The inherent transparent properties, functionality and large lateral dimensions offer material selection for sensor technologies and transparent flexible displays. Low temperature processing of large crystallographic ordered films is needed to prevent thermal degradation of modern flexible electronic substrates. In this study, polycrystalline TMD growth mechanisms and, for the first time, a scalable processing technique used at room temperature will be demonstrated for application of semiconducting TMDs directly onto substrates by laser processing. A means of controlling the material structure by photon-phonon excitation provides a low temperature approach to controlling structural changes in materials; in particular, these studies are conducted on thin-film molybdenum disulfide and tungsten disulfide. A significant variance in both structure and electronic properties upon laser processing are observed in all samples. The direct deposition of molybdenum disulfide and tungsten disulfide on cross-linked polymers followed by localized laser annealing results in few atomic layer hexagonal sheets confirmed by Raman analysis, x-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The strong enhanced A1g and E2g bands in Raman and bonding characteristic in XPS suggests the layered S-Mo-S and S-W-S bonding. Conductive atomic force microscopy (C-AFM) on laser exposed samples showed a change in topography and electrical properties from insulating material to semiconducting after laser annealed. Laser annealing of amorphous films on polymer substrates is a simple and scalable approach to patterning complex patterns of semiconducting MoS2 film in an insulating matrix or generating large areas of semiconducting material for fabrication of 2D based flexible/stretchable electronics.
Andrey Voevodin, Dr. (Committee Chair)
Christopher Muratore, Dr. (Committee Member)
Michael McConney, Dr. (Committee Member)
60 p.
Engineering; Materials Science
flexible electronics; nanomaterials; low temperature; transition metal dichalcogenides; thin film; heterostructures;

Recommended Citations

Citations

  • Shelton, T. E. (2015). Synthesis and Characterization of Crystalline Transition Metal Dichalcogenides onto Stretchable Substrates by Laser Processing [Master's thesis, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1450405970

    APA Style (7th edition)

  • Shelton, Travis. Synthesis and Characterization of Crystalline Transition Metal Dichalcogenides onto Stretchable Substrates by Laser Processing. 2015. University of Dayton, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1450405970.

    MLA Style (8th edition)

  • Shelton, Travis. "Synthesis and Characterization of Crystalline Transition Metal Dichalcogenides onto Stretchable Substrates by Laser Processing." Master's thesis, University of Dayton, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1450405970

    Chicago Manual of Style (17th edition)

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© 2015, all rights reserved.
This open access ETD is published by University of Dayton and OhioLINK.