Abstract
We report studies of the shape of the photoluminescence (PL) band in a-Si:H and its alloys with carbon and nitrogen, made in order to learn more about the broadening mechanism and to test models in which the distribution of initial states results from thermalisation down band tails. The central region and the high energy side of the band shows a double Gaussian form which becomes more symmetric with increasing alloying. The low energy side at intensities <30% of the maximum are better described by an exponential, which is however broader than the Urbach tail. In simple models like those of Dunstan[1] and Pickin[2] the Urbach slope should be greater or equal to that of the low energy PL. We discuss the results in the light of these models and consider the effects of alloy broadening.
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