Ustun's research is studying the activation and passivation of Mg in AlGaN alloys through a series of electron paramagnetic resonance (EPR) measurements of the hydrogen interaction with Mg in these alloys as a function of thermal anneals. The data suggest that the rate of passivation and activation of Mg depends on the mole fraction of Al in the AlxGa1-xN. This newfound trend may prove to be beneficial in improving the annealing process of AlGaN alloys to optimize p-type conductivity.
