The IR reflection spectra of structures that consisted of alternating layers of CdTe quantum dots and ZnTe barriers, grown onto ZnTe and CdTe/ZnTe buffer layers on GaAs(001) substrates, were studied. The spectra were processed using dispersion analysis, and the parameters of the oscillators were determined. In the spectra, quantum dots manifested themselves in the form of a broad band at a frequency close to the frequency of the Fröhlich mode. It was revealed that the spectra exhibited features associated with interdiffusion of the CdTe and ZnTe compounds, i.e., bands attributed to the local mode of Zn atoms in the CdTe compound and two gap modes of Cd atoms in the ZnTe compound.

Manifestation of CdTe Quantum Dots and Interdiffusion in IR Reflection Spectra of CdTe/ZnTe Structures with Quantum Dots. I.V.Kucherenko, V.S.Vinogradov, G.Karczewski, N.N.Novikova, M.C.Guidi, M.Piccinini: Physics of the Solid State, 2007, 49[8], 1563-6