Abstract
This paper reviews high pressure investigations of the physical properties of group III nitrides. After presenting the most important results of high pressure research in this field, we focus on the problem of donors and acceptors in GaN and AlGaN with the special emphasis on the highly localized electronic states. Oxygen and silicon donors and their resonant localized states are discussed in detail. Finally the anomaly of the pressure coefficient of the energy gap of InGaN, will be considered in the relation to the peculiarities of these mixed crystals band structure.
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