ELECTROCHEMICAL INVESTIGATION OF THE GALLIUM NITRIDE-AQUEOUS ELECTROLYTE INTERFACE

GaN (E(g) = similar to 3.4 eV) was photoelectrochemically characterize d and the energetic position of its bandedges determined with respect to SHE. Electrochemical impedance spectroscopy was employed to analyze the interface, determine the space charge layer capacitance, and, sub sequently obtain the flatband potential of GaN in different aqueous el ectrolytes. The flatband potential of GaN varied at an approximately N ernstian rate in aqueous buffer electrolytes of different pHs indicati ng acid-base equilibria at the interface.