A (Photo-)electrochemical study on n-GaN in aqueous solutions

Abstract

Results of electrochemical and luminescence experiments at the GaN/electrolyte interface are reported. It was found that n-GaN is stabilized against photodecomposition in Cl--containing solutions due to the competing oxidation of Cl- to Cl2 via intrinsic surface states. Photoluminescence measurements and electroluminescence measurements in persulfate solutions were also carried out. Substantial differences between electroluminescence and photoluminescence spectra were observed, allowing us to conclude that electroluminescence may partially originate from the (near) electrode surface. © 2002 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.