Applied Science and Convergence Technology 2019; 28(2): 24-29
Published online March 31, 2019
Copyright © The Korean Vacuum Society.
Department of Physics, Mokpo National University, Chonnam 58554, Republic of Korea
The structural and optical properties of Cd1-
CdGa2Se4, is one of the AIIB2IIIC4VI (A = Cd, Zn, Hg, B = Ga, In, Al, C = S, Se, and Te)-type ternary semiconductors, and has become a subject of interest as a material with potential applications in optoelectronics owing to its high photosensitivity and strong luminescence in the visible region . Many studies have been performed on the optical characterizations of CdGa2Se4, namely optical absorption , photoconductivity [3,4], photoluminescence , and Raman scattering [6,7]. The doping effects of cobalt metals as impurities in CdGa2Se4 have also been studied [4,8]. To increase the applicability of CdGa2Se4, a method of controlling its fundamental properties by doping impurities is required. In previous works [9,10], we studied the structural and optical properties for 0.0 ≤
In this paper, we investigate the composition-dependent behavior of the structural and optical properties for the full range, 0.0 ≤
The composition of the grown crystals was determined by means of inductively coupled plasma mass spectroscopy (JY 38 PLUS, France). The crystals within the error limits of 3 % from their start compositions were used in the measurements. The analysis of the crystal structure was performed using an X-ray diffractometer (Rigaku DMAX 2000, Japan). The optical absorption spectra were measured in the range 300–2400 nm at 300 K using a UV-VIS-NIR spectrophotometer (Hitachi U-3501, Japan) equipped with a 60-mm integrating sphere.
Figure 1 shows the X-ray diffraction (XRD) pattern spectra for the Cd1-
The tetragonal lattice constants,
where the Se atom coordinate,
The results are summarized in
Figure 5 shows the optical absorption spectra for the composition 0.0 ≤
In this work, the structural and optical properties of Cd1-
This research was supported by the Research Funds of Mokpo National University in 2017.
Various values of the lattice constants, tetragonal distortion, and atomic coordinate for the Cd1-
|Composition (||Structure||Lattice constants||2||2-||u|
Values of the observed absorption band energies, crystal-field parameter
|Composition (||Observed absorption bands||4T1(4F)||Dq||B|
|Γ6||Γ8||Γ7 + Γ8|