Investigation of surface morphology of n‐type GaN after photoelectrochemical reaction in various solutions for H2 gas generation

Surface morphology and chemical composition at n-type GaN surface after photoelectrochemical reactions were investigated. Whisker-like Ga oxides were observed in the lower pH solutions and hexagonal columns were observed in the higher pH solutions. The results indicate that different reactions occur in the different pH solutions. Dissolution amount was the lowest at a neutral pH solution. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)