Electrochemical Investigation of the Gallium Nitride-Aqueous Electrolyte Interface

Shyam S. Kocha, Mark W. Peterson, Douglas J. Arent, John A. Turner

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Abstract

GaN (Eg = —3.4 eV) was photoelectrochemically characterized and the energetic position of its bandedges determined with respect to SHE. Electrochemical impedance spectroscdpy was employed to analyze the interface, determine the space charge layer capacitance, and, subsequently obtain the flatband potential of GaN in different aqueous electrolytes. The flatband potential of GaN varied at an approximately Nernstian rate in aqueous buffer electrolytes of different pHs indicating acid-base equilibria at the interface.

Original languageAmerican English
Pages (from-to)L238-L240
JournalJournal of the Electrochemical Society
Volume142
Issue number12
DOIs
StatePublished - 1995

NREL Publication Number

  • NREL/JA-452-20234

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