Journal
OPTICS AND SPECTROSCOPY
Volume 109, Issue 2, Pages 268-271Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S0030400X10080199
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A comparative analysis of the Raman spectra of bulk PbS and PbS nanocrystals with average diameters of 6.6 and 3.8 nm has been performed. It is shown that the bands due to the LO phonons at the I point of the Brillouin zone dominate in the first- and second-order Raman spectra of the nanocrystals. Based on the analysis of the relative band intensities for the first- and second-order spectra a qualitative conclusion is drawn: the electron-LO-phonon interaction in PbS nanocrystals increases with a decrease in their size.
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