PHOTOLUMINESCENCE OF SILICON-HYDROGEN FILMS

The photoluminescence of silicon-hydrogen films grown in HF-NaNO2 solu tions in static and dynamic regimes has been studied. Two types of pho toluminescence spectra are observed. The spectra of the first type hav e symmetric bands, like the spectra of porous silicon. The lineshape, the positions of the peaks, and their half-widths depend only weakly o n the temperature. The emission spectra of the second type are observe d in certain samples during excitation of the photoluminescence of fil ms formed on the lower (''nonworking'') side of the silicon plates. Th ese spectra consist of two photoluminescence bands. The shorter-wave b and has a stronger temperature dependence than the long-wave band. As the temperature is lowered, the shorter-wave band moves toward higher photon energies.