PHOTOLUMINESCENCE AND ELECTRONIC DENSITY-OF-STATES IN A-C-H FILMS

The density of states in the energy region neat Fermi level for hydrog enated amorphous carbon thin films is presented. The different types o f states are identified in their origin and the problem of their detec tion is considered. It is shown that only some of these states are acc essible to detection by electron spin resonance. A quantitative correl ation between their density and the quantum efficiency of the room tem perature photoluminescence process is achieved. Such correlation appli es to films having a wide range of physical properties deposited by di fferent techniques. (C) 1998 American Institute of Physics. [S0005-695 1(98)00520-8].