Abstract

We report results of a study of the electron-hole effective mass in CdS_xSe_1-x nanocrystals embedded in a glass matrix. By varying annealing temperature and growth times, we obtained a series of samples with various crystallite sizes from 40 to 200 Å. Raman experiments and transmission electron microscopy were carried out to determine the composition and crystallite diameter of the semiconductor dots, respectively. The compositions of the semiconductor nanocrystals were found to be independent of particle size so the absorption peak position is solely due to the size. Electromodulation, absorption, and photoluminescence spectra were measured to identify the quantized energy levels. Two electromodulation peaks due to light and heavy hole bands are clearly resolved.

© 1991 Optical Society of America