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M.S. thesis_NA-07-10-2019.pdf (16.62 MB)

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Defects and Optoelectronic properties of Zinc oxide

Adhikari, Naresh
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1562770832047501

Abstract Details

2019, Master of Science (MS), Bowling Green State University, Physics.
Zinc oxide (ZnO) is a compound semiconductor with a direct wide band gap of 3.4 eV with a high exciton binding energy of 60 meV at room temperature. It is a widely investigated semiconductor due to its high potential for optoelectronic applications in the UV region, especially, for light-emitting diodes and lasers. In these applications of ZnO, native point defects play key roles. The understanding of these defects will help us to realize and control the performance of ZnO in these applications. Also, it will help us to realize p-type doping in ZnO, which will open a way for oxide semiconductor based bipolar devices. Due to the reproducibility of high-quality ZnO crystals and their interesting properties, it is preferred for extensive research over other wide band gap semiconductors. So far, as research points out, native point defects are not well understood. In our work, we will present electrical and optical characterization studies done on ZnO single crystals as well as on polycrystals, and we will relate these measurements to defect studies using Positron Annihilation Lifetime Spectroscopy (PALS) and Coincident Doppler Broadening Spectroscopy (CDBS). It was found that the increase in well-known green luminescence is associated with a decrease in conductivity and charge carrier concentration. Positron lifetime spectroscopy measurements were carried out to reveal the origin of defects responsible for decreasing the conductivity and enhancing the green luminescence. Lastly, it was interesting to observe the decrease in the ratio between green luminescence to near band emission as the laser power increased.
Farida Selim, Ph.D. (Advisor)
Lewis P. Fulcher, Ph.D. (Committee Member)
Marco Nardone, Ph.D. (Committee Member)
64 p.
Physics
Zinc Oxide; Electrical and Optical properties; Defects in ZnO

Recommended Citations

Citations

  • Adhikari, N. (2019). Defects and Optoelectronic properties of Zinc oxide [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1562770832047501

    APA Style (7th edition)

  • Adhikari, Naresh. Defects and Optoelectronic properties of Zinc oxide. 2019. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1562770832047501.

    MLA Style (8th edition)

  • Adhikari, Naresh. "Defects and Optoelectronic properties of Zinc oxide." Master's thesis, Bowling Green State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1562770832047501

    Chicago Manual of Style (17th edition)

bgsu1562770832047501
304
© 2019, some rights reserved.Creative Commons License Defects and Optoelectronic properties of Zinc oxide by Naresh Adhikari is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Bowling Green State University and OhioLINK.