The role of π and π gaussian-like density-of-states bands in the interpretation of the physical properties of a-C and a-C:H films

Many relevant properties of a-C and a-C:H films are due to the distribution of π and π ∗ states. We assume π and π ∗ bands to be gaussian shaped, as a consequence of the different size of the graphic-like islands and of their different abundances. We show that this assumption allows most of the peculiar properties of a-C and a-C:H films to be understood.