PHOTO-INDUCED AND THERMALLY-INDUCED PHENOMENA IN AMORPHOUS GE30SB10S60 FILMS

Thin Ge30Sb10S60 films were prepared and changes of their optical prop erties, Raman and infrared spectra, induced by illumination and anneal ing have been studied. Bleaching and darkening of exposed films was ob served, depending on the initial state of the film and conditions of l ight exposure or annealing. The changes of optical properties are assi gned to the change of homopolar bond densities. The dispersion of the refractive index of the virgin, exposed and annealed films can be desc ribed using the Wemple-Di Domenico single-oscillator model. Changes of the single oscillator energy, E(0), and dispersion energy, E(d), indu ced by illumination and annealing are discussed.