Far-infrared study of alloying in the HgTe-CdTe superlattice

Perkowitz, S.; Rajavel, D.; Sou, I. K.; Reno, J.; Faurie, J. P.; Jones, C. E.; Casselman, T.; Harris, K. A.; Cook, J. W.; Schetzina, J. F.
September 1986
Applied Physics Letters;9/29/1986, Vol. 49 Issue 13, p806
Academic Journal
The far-infrared reflectivity spectra of three HgTe-CdTe superlattices from two sources [HgTe/CdTe thicknesses (Ã…/Ã…): 64/26, 7/35, 32/57] have been measured at 300, 77, and 6 K. Analysis of transverse optical phonon structure between 80 and 180 cm-1 with different alloying models shows that the first of these superlattices contains HgTe and CdTe with no evidence of significant mixing, whereas the others contain HgTe and homogeneous Hg1-xCdxTe. An earlier study of the HgTe-CdTe band gap also indicated homogeneous alloying. The reflectivity data were analyzed with a superlattice dielectric function which is shown to be valid in the far infrared.


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