Evolution of III-V nitride alloy electronic structure: the localized to delocalized transition |
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Authors: | Kent P R Zunger A |
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Institution: | National Renewable Energy Laboratory, Golden, Colorado 80401, USA. |
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Abstract: | Addition of nitrogen to III-V semiconductor alloys radically changes their electronic properties. We report large-scale electronic structure calculations of GaAsN and GaPN using an approach that allows arbitrary states to emerge, couple, and evolve with composition. We find a novel mechanism of alloy formation where localized cluster states within the gap are gradually overtaken by a downwards moving conduction band edge, composed of both localized and delocalized states. This localized to delocalized transition explains many of the hitherto puzzling experimentally observed anomalies in III-V nitride alloys. |
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