Temperature dependence of the absorption spectra in CdTe-doped glasses

We present absorption spectra as a function of temperature for CdTe quantum dots in doped glasses. We calculate the absorption spectra considering the transition energies from a spherical k.p model. We consider also the inhom ogeneous broadening due to the quantum-dot size distribution and the homoge neous broadening, due mainly to electron-phonon interactions. The samples g rown with a two-step heat treatment present very thin size distributions, w ith a standard deviation of 5.8%, which is comparable to the best CdSe samp les in the literature. Also, the results show that the homogeneous width in creases as the quantum-dot size decreases, indicating an enhancement of the electron-phonon interaction for small dots.