Multi-technique Investigation of Ni-doped ZnO Thin Films on Sapphire by Metalorganic Chemical Vapor Deposition

Abstract

Optical and material properties of nickel-doped zinc oxide (ZnO-Ni) grown by metalorganic chemical vapor deposition with varying Ni source flow rates are investigated. ZnO-Ni showed a good crystal quality with (002) orientation but deteriorated at high Ni source flow rates. Photoluminescence responses show a reduction in the bandgap of ZnO-Ni with an increase in the Ni source flow and also with an increase in the temperature. Ni-doping can enhance luminescences at low concentrations (<25 SCCM and ∼2%) and suppress at high concentrations. Ni-related defects occur more toward the surface than bulk of the thin films. Longitudinal optical phonon replicas named 1LO and 2LO redshifts at low Ni source flow rates ≤100 SCCM with an increase in the temperature from 14 to 300 K, but exhibits an "S-shaped"red-blue-red shift with a dip at 50 K at higher Ni source flow rates (150 SCCM). Ni-doping also induces asymmetric crystal vibrations and rougher surfaces with the Ni incorporation. This study enhances the understanding of Ni-doped ZnO that is needed to apply transition-metal doped ZnO for various optoelectronic applications.

Department(s)

Electrical and Computer Engineering

International Standard Serial Number (ISSN)

1520-8559; 0734-2101

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2024 American Vacuum Society; American Institute of Physics, All rights reserved.

Publication Date

01 Mar 2021

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