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Modeling Program for Temperature Dependence of the Urbach Energy in Ordered Defect Compounds Cu-III3-VI5 and Cu-III5-VI8 | ||
| Al-Mustansiriyah Journal of Science | ||
| Article 1, Volume 20, Issue 5, 2009, Pages 116-123 | ||
| Author | ||
| Bassaad H. Hamza | ||
| Abstract | ||
| A modeling program used and have been employed to study the temperature dependence of the Urbach energy in ordered compounds Cu-III3-VI5 and Cu-III5-VI8. Dependence of the absorption coefficient on the photon energy and temperature near the fundamental absorption edge was measured. The characteristic Urbach's parameters such as steepness parameter [( T)] and Urbach's energy [(Eu = kBT_)] were determined. Analyzing the temperature dependence of these parameters based on the general models, which takes into account the possible role of several different types of disorder. We conclude that the model which contains two variable parameters seems to explain better the data over the whole temperature range studied. The ordered vacancy or the donor acceptor defect pair in the cation sub lattice provides new features in these compounds that need further study. | ||
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