Abstract
Confinement effects are observed in CdS x Se 1− x semiconductor nanocristallites (‘quantum dots’) in a borosilicate glass. The absorption spectra are measured at 4.5 and 300 K. The width of the first excitonic peak was recorded as a function of particle sizes between 2 and 7.6 nm, these sizes being determined by lopw frequency inelastic Raman scattering (LOFIRS). The smallest width of the first excitonic absorption peak was observed for particles with a radius a = 2 nm. It is further shown from Raman scattering that the composition of the nanocrystallites remains constant ( x = 0.25) during their growth.
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