npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Physics: Sae Mulli 2017; 67: 915-921

Published online August 31, 2017 https://doi.org/10.3938/NPSM.67.915

Copyright © New Physics: Sae Mulli.

Studies of the Crystal Structure and Optical Properties of Zn$_{0.95}$Mn$_{0.05}$S Epilayers

Dae Jung KIM*1, Bong Jin KIM1, Duk Hyeon KIM1, Jong Won LEE2

1 School of Basic Sciences, Hanbat National University, Daejeon 34158, Korea
2 Advanced Materials Engineering, Hanbat National University, Daejeon 34158, Korea

Correspondence to:djkim10@hanbat.ac.kr

Received: February 10, 2017; Revised: April 7, 2017; Accepted: April 28, 2017

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Zn$_{0.95}$Mn$_{0.05}$S epilayers were grown on GaAs (100) substrates by using the hot-wall epitaxy method. X-ray diffraction was used to study the crystallinity and the crystal orientation of the epilayer. The surface morphology of the epilayer was observed by scanning electron microscopy-energy dispersive X-ray spectrograph (SEM-EDS). The optical properties of the epilayers were investigated in a wide photon energy range between 2.0$\sim$8.7 eV by using spectroscopic ellipsometry (SE) and were studied in the transmittance spectra in the wavelength range from of 400 to 700 nm at room temperature. The obtained data were analyzed to find both the critical points of the pseudodielectric function spectra, $<\varepsilon(E)>$ = $<\varepsilon_1(E)> + i<\varepsilon_2(E)>$, such as $E_0/E_0 +\Delta_0$, $E_1$, and the three $E_2(\Sigma, \Delta, \Gamma)$ structures. Also, the pseudodielectric-function-related optical constants of Zn$_{0.95}$Mn$_{0.05}$S, such as the $\alpha(E)$, were analyzed. The optical energy band gap, $E_g$ = 3.72 eV, was determined from the transmittance spectrum of the free-standing film and was compared with the calue of $E_0$ = 3.80 eV obtained from the SE measurement.

Keywords: ZnMnS, XRD, SEM-EDS, Spectroscopic ellipsometry, Hot-wall epitaxy, Pseudodielectric function, Transmittance

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