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Theory and Experiment of Chalcogenide Materials

Prasai, Binay K.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1374002400

Abstract Details

2013, Doctor of Philosophy (PhD), Ohio University, Physics and Astronomy (Arts and Sciences).
In this dissertation, we present the experimental and theoretical investigation of extensive properties of chalcogenide materials and their potential application in solid electrolytes and phase change memory materials. Extended X-ray absorption fine structure (EXAFS) spectroscopy was employed to study the structural properties and the results were validated from the computer simulated models through ab-initio molecular dynamic (AIMD) simulations. EXAFS analysis on Ge-Sb-Te (GST) alloys, synthesized using electrodeposition and radio frequency sputtering methods confirmed the structural similarities in Ge-Te and Sb-Te bond pairs suggesting the possibility of utilizing the electrodeposition method to grow GST alloys in nanoporous materials and thus enabling miniaturizing the phase change memory devices. The analyses of structural, electronic and optical properties of computer generated amorphous and crystalline TiO2 confirmed the structural similarities of amorphous TiO2 with the anatase phase of crystalline TiO2 and hence recommending the possibilities of replacing the crystalline TiO2 by less processed thus cheaper form of amorphous TiO2. Moreover, the AIMD simulations of the ionic conductivity of transitions metals like Ag and Cu in Ge-Se glasses confirmed the superiority of Ag over Cu in terms of conductivity. Ag was found to be easily hopping around while Cu was often trapped. In addition, an experimental and computational investigation on Ag-doped Ge-Sb-Te alloys predicted an enhanced crystallization of Ge-Sb-Te alloys. The enhanced crystallization was related to the reduction of fraction of tetrahedral Ge relative to octahedral Ge as also reflected as the increased Ge-Te bond lengths on adding Ag. Finally, further investigation of dopant-induced modification of GST alloys with transition metals (Cu, Ag and Au) demonstrated the superiority of Ag over Cu and Au regarding crystalline speed while at  2% dopant level no significant structural modification was observed.
David Drabold, Dist. Prof. (Advisor)
Gang Chen, Associate Prof. (Advisor)
156 p.
Condensed Matter Physics; Physics
phase change memory materials; molecular dynamics; solid electrolytes; EXAFS

Recommended Citations

Citations

  • Prasai, B. K. (2013). Theory and Experiment of Chalcogenide Materials [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1374002400

    APA Style (7th edition)

  • Prasai, Binay. Theory and Experiment of Chalcogenide Materials. 2013. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1374002400.

    MLA Style (8th edition)

  • Prasai, Binay. "Theory and Experiment of Chalcogenide Materials." Doctoral dissertation, Ohio University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1374002400

    Chicago Manual of Style (17th edition)

ohiou1374002400
1,161
© 2013, some rights reserved.Creative Commons License Theory and Experiment of Chalcogenide Materials by Binay K. Prasai is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Ohio University and OhioLINK.
Release 3.2.12