Second- and Third-order Raman Scattering in Bulk and Glass-embedded Nanometric CdS1 – xSex Crystals

Authors V.V. Lopushansky

Institute of Electron Physics, Ukrainian National Academy of Sciences, 21, Universytetska Str., 88017 Uzhhorod, Ukraine

Issue Volume 6, Year 2014, Number 4
Dates Received 16 July 2014; published online 29 November 2014
Citation V.V. Lopushansky, J. Nano- Electron. Phys. 6 No 4, 04006 (2014)
PACS Number(s) 78.30.Fs, 78.67.Bf, 63.20.kd
Keywords Raman scattering (4) , Nanocrystals (3) , Electron-phonon coupling.
Annotation Second- and third-order Raman spectra of bulk and nanometric CdS1 – xSex crystals were measured. At off-resonance excitation conditions the second-order Raman spectra of bulk CdS1 – xSex exhibit anharmonic coupling of optical phonons and two-phonon states with the participation of acoustic phonons. Resonant Raman spectra of CdS1 – xSex single crystals with a strong enhancement of multiple LO phonon bands show the evidence for the strong electron-phonon coupling in bulk CdS1 – xSex crystals. From the ratio of intensities of multiple and single LO phonon bands in the resonance Raman spectra of the glass-embedded CdS1 – Sex nanocrystals one may conclude that the electron-phonon coupling in the nanocrystals is much smaller than in the corresponding bulk materials.

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