Phonons and vibrations and their influence on the optical processes in non-crystalline semiconductors Available to Purchase

The phonons and vibrations play the important role not only in the region of thermal phenomena, but in optical processes in non-crystalline solids, too. The vibrations of the nano-regions of the glasses semiconductors create the conditions for optical absorption in the mid-gap energy regions. In this paper we elucidate the optical absorption and photoinduced absorption under lateral band-gap light excitation for various values of energy of mid-gap photons and the dependence of the mid-gap absorption on the power of excited radiation, too. We come out from the hypothesis according which the photoinduced traps in chalcogenide glasses are created in energetical region belonging to the photoluminiscence spectra. The probability of the creation of traps corresponds whereas to the profile of the spectra. From mentioned hypothesis results whole row of implications which very good correspondent with experimental facts. Created photoinduced traps are at excitation photoluminescence radiation filled by free electrons from conduction band. The occupying of the traps with electrons (and in this way also the creation of the paramagnetic centers) is connected with the increasing of the electron-spin-resonance signal. Barrier-cluster-heating model explains also photoluminescence amplifying by mid-gap absorption.