3d-doped CdGa2O4결정의 광학적 특성

Abstract

In the present work, basic studies on optical properties of 3d-doped CdGa2O4 crystals were carried out. The composition, structure, and optical properties of 3d-doped CdGa2O4 crystals were studied Stoichiometry of these compound semiconductors were determined using the energy dispersive x-ray analyser(EDX). The quantitative ratios of composition elements between the starting samples and the measured samples are reasonable values from the results of EDX with in the limit of detection error. The x-ray diffraction(XRD) analysis revealed that CdGa2O4 and CdGa2O4:Co crystals have a cubic structure. The lattice constant of these samples were ɑ=8.6069Å for CdGa2O4 and ɑ=8.6041Å for CdGa2O4:Co crystals. The optical absorption spectra obtained near the fundamental absorption edge showed that these compounds have a direct energy band gaps. The direct energy gaps of CdGa2O4 and CdGa2O4:Co are given by 3.428eV and 3.295eV at 298K, respectively.