DOI: 10.1063/1.1526935. Infrared dielectric functions and phonon modes of high-quality ZnO films

Infrared dielectric functions and phonon modes of high-quality ZnO films

10.1063/1.1526935

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

Infrared dielectric function spectra and phonon modes of high-quality, single crystalline, and highly resistive wurtzite ZnO films were obtained from infrared (300–1200 cm−1) spectroscopic ellipsometry and Raman scattering studies. The ZnO films were deposited by pulsed-laser deposition on c-plane sapphire substrates and investigated by high-resolution x-ray diffraction, high-resolution transmission electron microscopy, and Rutherford backscattering experiments. The crystal structure, phonon modes, and dielectric functions are compared to those obtained from a single-crystal ZnO bulk sample. The film ZnO phonon mode frequencies are highly consistent with those of the bulk material. A small redshift of the longitudinal optical phonon mode frequencies of the ZnO films with respect to the bulk material is observed. This is tentatively assigned to the existence of vacancy point defects within the films. Accurate long-wavelength dielectric constant limits of ZnO are obtained from the infrared ellipsometry analysis and compared with previously measured near-band-gap index-of-refraction data using the Lyddane–Sachs–Teller relation. The ZnO model dielectric function spectra will become useful for future infrared ellipsometry analysis of free-carrier parameters in complex ZnO-based heterostructures.

Bibliography

Ashkenov, N., Mbenkum, B. N., Bundesmann, C., Riede, V., Lorenz, M., Spemann, D., Kaidashev, E. M., Kasic, A., Schubert, M., Grundmann, M., Wagner, G., Neumann, H., Darakchieva, V., Arwin, H., & Monemar, B. (2003). Infrared dielectric functions and phonon modes of high-quality ZnO films. Journal of Applied Physics, 93(1), 126â133.

Authors 15

N. Ashkenov (first)
B. N. Mbenkum (additional)
C. Bundesmann (additional)
V. Riede (additional)
M. Lorenz (additional)
D. Spemann (additional)
E. M. Kaidashev (additional)
A. Kasic (additional)
M. Schubert (additional)
M. Grundmann (additional)
G. Wagner (additional)
H. Neumann (additional)
V. Darakchieva (additional)
H. Arwin (additional)
B. Monemar (additional)

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Dates

Type	When
Created	22 years, 8 months ago (Dec. 28, 2002, 11:52 a.m.)
Deposited	1 year, 6 months ago (Feb. 7, 2024, 7:39 a.m.)
Indexed	2 weeks, 2 days ago (Aug. 19, 2025, 6:21 a.m.)
Issued	22 years, 8 months ago (Jan. 1, 2003)
Published	22 years, 8 months ago (Jan. 1, 2003)
Published Print	22 years, 8 months ago (Jan. 1, 2003)

Funders 0

None

BibTeX

@article{Ashkenov_2003, title={Infrared dielectric functions and phonon modes of high-quality ZnO films}, volume={93}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.1526935}, DOI={10.1063/1.1526935}, number={1}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Ashkenov, N. and Mbenkum, B. N. and Bundesmann, C. and Riede, V. and Lorenz, M. and Spemann, D. and Kaidashev, E. M. and Kasic, A. and Schubert, M. and Grundmann, M. and Wagner, G. and Neumann, H. and Darakchieva, V. and Arwin, H. and Monemar, B.}, year={2003}, month=jan, pages={126–133} }

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