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Synthesis and Characterization of Transparent Conductive Zinc Oxide Thin Films by Sol-gel Spin Coating Method

Winarski, David J
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1434124579

Abstract Details

2015, Master of Science (MS), Bowling Green State University, Physics.
Zinc oxide has been given much attention recently as it is promising for various semiconductor device applications. ZnO has a direct band gap of 3.3 eV, high exciton binding energy of 60 meV and can exist in various bulk powder and thin film forms for different applications. ZnO is naturally n-type with various structural defects, which sparks further investigation into the material properties. Although there are many potential applications for this ZnO, an overall lack of understand and control of intrinsic defects has proven difficult to obtain consistent, repeatable results. This work studies both synthesis and characterization of zinc oxide in an effort to produce high quality transparent conductive oxides. The sol-gel spin coating method was used to obtain highly transparent ZnO thin films with high UV absorbance. This research develops a new more consistent method for synthesis of these thin films, providing insight for maintaining quality control for each step in the procedure. A sol-gel spin coating technique is optimized, yielding highly transparent polycrystalline ZnO thin films with tunable electrical properties. Annealing treatment in hydrogen and zinc atmospheres is researched in an effort to increase electrical conductivity and better understand intrinsic properties of the material. These treatment have shown significant effects on the properties of ZnO. Characterization of doped and undoped ZnO synthesized by the sol-gel spin coating method was carried out using scanning electron microscopy, UV-Visible range absorbance, X-ray diffraction, and the Hall Effect. Treatment in hydrogen shows an overall decrease in the number of crystal phases and visible absorbance while zinc seems to have the opposite effect. The Hall Effect has shown that both annealing environments increase the n-type conductivity, yielding a ZnO thin film with a carrier concentration as high as 3.001 × 1021 cm-3.
Farida Selim, Dr. (Advisor)
Lewis Fulcher, Dr. (Committee Member)
Haowen Xi, Dr. (Committee Member)
99 p.
Condensed Matter Physics; Materials Science; Physics
zinc oxide; sol-gel; spin coat; transparent conductive oxide; annealing; hydrogen; zinc;

Recommended Citations

Citations

  • Winarski, D. J. (2015). Synthesis and Characterization of Transparent Conductive Zinc Oxide Thin Films by Sol-gel Spin Coating Method [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1434124579

    APA Style (7th edition)

  • Winarski, David. Synthesis and Characterization of Transparent Conductive Zinc Oxide Thin Films by Sol-gel Spin Coating Method. 2015. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1434124579.

    MLA Style (8th edition)

  • Winarski, David. "Synthesis and Characterization of Transparent Conductive Zinc Oxide Thin Films by Sol-gel Spin Coating Method." Master's thesis, Bowling Green State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1434124579

    Chicago Manual of Style (17th edition)

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© 2015, all rights reserved.
This open access ETD is published by Bowling Green State University and OhioLINK.