p-GaN Cathode Degradation Correlated with Hydrogen Passivation during Water Photolysis under UV Light
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We investigated the mechanism of p-GaN cathode degradation in Na2SO4 solution under UV light irradiation. During water photolysis, photocurrent and hydrogen production decreased with time at a zero bias. Samples degraded by UV light irradiation showed an increase in photoluminescence (PL) intensity and a decrease in hole concentration compared with those before UV light irradiation. Annealing the degraded samples at 850 °C in N2 ambient resulted in a decrease in PL intensity and an increase in hole concentration. These changes suggest that hydrogen passivation occurs as the mechanism of p-GaN cathode degradation during water photolysis.
- Jpn J Appl Phys
Jpn J Appl Phys 46(2), 572-573, 2007-02-15
INSTITUTE OF PURE AND APPLIED PHYSICS