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Multi-Mode behavior of optical phonons in II-VI ternary and quaternary alloys

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Abstract

Zone-center optical phonons of tetrahedrally coordinatedII-VI semiconductor ternary (AB1-xCx) and quaternary (AB1-x-yCxDy) alloys display a variety of distinct multi-mode behavior patterns. A brief review of the modified random element isodisplacement model, which can satisfactorily account for the composition dependence of the frequencies of the zone-center optical phonons, is presented; in this model, one uses the macroscopic parameters of the binary end members and their LO-TO phonon frequencies. When a constituent is present in extreme dilution in a binary (or in a ternary), e.g., C in AB (or in AB1-y Dy), one sees either a local or a gap mode associated with it. For higher concentrations, one can see two (three) LO-TO phonon pairs for the ternary (quaternary) in the first order Raman spectrum or in the infra-red deduced from an analysis of the reststrahlen bands, when the masses of B and C differ significantly but are lighter than that of A. We illustrate these features in the Raman spectra of Cd1-xMgxTe and Cd1-x-y MgxMnyTe. Also shown are the infra-red spectra of the local mode of Mg2+ and Mn2+ in Cd Te, where their isotopic nature is clearly manifested.

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  1. Department of Physics, Purdue University, 47907-1396, West Lafayette, IN

    Eunsoon Oh & A. K. Ramdas

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  1. Eunsoon Oh
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Oh, E., Ramdas, A.K. Multi-Mode behavior of optical phonons in II-VI ternary and quaternary alloys. J. Electron. Mater. 23, 307–312 (1994). https://doi.org/10.1007/BF02670640

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  • DOI: https://doi.org/10.1007/BF02670640

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