A physical explanation to the controversial Urbach tailing universality
Unité de physique des dispositifs à semi-conducteurs, Faculté des sciences de Tunis, Université de Tunis El Manar, 63 Rue Sidi Jabeur, 5100, Mahdia, Tunisia
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Accepted: 15 December 2010
Published online: 21 January 2011
Doping-related behavior divergence of some crystalline materials has raised doubts about Urbach tailing universality. In this paper, we infer the atomic scale interpretation of this divergence on the basis of experimental records and comparative studies. We focus on a widely known würtzite structured crystal and find that Urbach tailing was inhibited once doping charged loci succeeded to establish local coordinated donors networks or so-called topological filaments. The case of doping-free and saturated ZnO networks unexpected Urbach tailing features has been discussed. All the observed behaviors confirm the Urbach tailing universality despite their controversial aspect.
© Società Italiana di Fisica and Springer, 2011