EXAFS Analysis of the Local Structure of Cd(1-x)MxTe (M=Cr, Fe, Ni)
- Beamline Research Division, Pohang Accelerator Laboratory, Pohang 790-784 (Korea, Republic of)
- Department of Semiconductor Applications, Ulsan College, Ulsan, 680-749 (Korea, Republic of)
- Research Center Dielect and Advanced Material Physics, Pusan National University, Pusan, 609-735 (Korea, Republic of)
CdTe, doped with transition metals, has received much attention for decades as promising II-VI dilute magnetic semiconductor materials. High purity Cd(1-x)MxTe (M=Cr, Fe, Ni) monocrystals have been prepared by the Bridgman method. Because the solubility of transition metals in CdTe is rather small, the zinc-blende phases were prepared in the limit of x {<=} 0.1. The local structural relaxation and effects of metal ion substitution on CdTe have been studied by measuring the fluorescence detected X-ray absorption fine structure (XAFS) spectra of the M K-edges and Te L1-edges. While II-VI compounds show significant variations of band structures, carrier densities and mobilities depending on the amount of donor or acceptor, XANES and EXAFS analysis of the M K-edge spectra reveal that only slight variations of oxidation states and bond lengths appear in no connection with atomic number of substituting metals, On the other hand, Te L1-edge spectra, for example of Cd(1-x)FexTe, exhibit rather a strong distortion around the central atom as a function of x. This distortion is attributed to the redistribution of Cd atoms from their original locations as the Fe concentration increases.
- OSTI ID:
- 21054678
- Journal Information:
- AIP Conference Proceedings, Vol. 882, Issue 1; Conference: XAFS13: 13. international conference on X-ray absorption fine structure, Stanford, CA (United States), 9-14 Jul 2006; Other Information: DOI: 10.1063/1.2644589; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
BOND LENGTHS
CADMIUM TELLURIDES
CARRIER DENSITY
CARRIER MOBILITY
CHROMIUM COMPOUNDS
DOPED MATERIALS
FINE STRUCTURE
FLUORESCENCE
IRON COMPOUNDS
MAGNETIC SEMICONDUCTORS
MONOCRYSTALS
NICKEL COMPOUNDS
RELAXATION
SOLUBILITY
VALENCE
VARIATIONS
X-RAY SPECTRA
X-RAY SPECTROSCOPY