Neutral Nitrogen Acceptors in ZnO: The ⁶⁷Zn Hyperfine Interactions

Authors

Eric M. Golden [*], Air Force Institute of Technology
S. M. Evans, West Virginia University
Larry E. Halliburton, West Virginia University
Nancy C. Giles, Air Force Institute of TechnologyFollow

Document Type

Article

Publication Date

3-2014

Abstract

Electron paramagnetic resonance (EPR) is used to characterize the ⁶⁷Zn hyperfine interactions associated with neutral nitrogen acceptors in zinc oxide. Data are obtained from an n-type bulk crystal grown by the seeded chemical vapor transport method. Singly ionized nitrogen acceptors (N⁻) initially present in the crystal are converted to their paramagnetic neutral charge state (N⁰) during exposure at low temperature to 442 or 633 nm laser light. The EPR signals from these N⁰ acceptors are best observed near 5 K. Nitrogen substitutes for oxygen ions and has four nearest-neighbor cations. The zinc ion along the [0001] direction is referred to as an axial neighbor and the three equivalent zinc ions in the basal plane are referred to as nonaxial neighbors. For axial neighbors, the ⁶⁷Zn hyperfine parameters are A_‖ = 37.0 MHz and A_⊥ = 8.4 MHz with the unique direction being [0001]. For nonaxial neighbors, the ⁶⁷Zn parameters are A₁ = 14.5 MHz, A₂ = 18.3 MHz, and A₃ = 20.5 MHz with A₃ along a [10ˉ10] direction (i.e., in the basal plane toward the nitrogen) and A₂ along the [0001] direction. These ⁶⁷Zn results and the related ¹⁴N hyperfine parameters provide information about the distribution of unpaired spin density at substitutional neutral nitrogen acceptors in ZnO.

Comments

© 2014 AIP Publishing LLC, published under an exclusive license with American Institute of Physics.

AFIT Scholar, as the repository of the Air Force Institute of Technology, furnishes the published Version of Record for this article in accordance with the sharing policy of the publisher, AIP Publishing. A 12-month embargo was observed.

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics 115:103703 as fully cited below and may be found at 10.1063/1.4867736.

Plain-text title: Neutral Nitrogen Acceptors in ZnO: The 67Zn Hyperfine Interactions

[*] Author note: Eric Golden was an AFIT PhD candidate at the time of publication.

DOI

10.1063/1.4867736

Source Publication

Journal of Applied Physics (ISSN 0021-8979 | e-ISSN 1089-7550)

Recommended Citation

E.M. Golden, S.M. Evans, L.E. Halliburton, and N.C. Giles, J. Appl. Phys. 115, # 103703 (2014). https://doi.org/10.1063/1.4867736