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Stable response to visible light of InGaN photoelectrodes
9.J. Wu, W. Walukiewicz, K. M. Yu, W. Shan, J. W. Ager III, E. E. Haller, H. Lu, W. J. Schaff, W. K. Metzger, and Sarah Kurtz, J. Appl. Phys. 94, 6477 (2003).
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17.The onset potential represents the flatband potential because the photocurrent only occur when . The slope of the versus graphs is dependent on the dopant concentration of the samples, . The dopant concentrations of the thin films are different from each other. So the slopes are unsystematic.
18.The loss percentage of the electrode can be estimated from the variation of the ratio of indium before and after the electrode is irradiated, since the variation of atomic ratio of Ga is negligible. For example, the atomic ratio of indium is 0.92% in the sample before the photoelectrochemical measurement, while the ratio of indium is 0.87% after irradiated in HBr solution. Then the loss percentage of the electrode is about 5.4%. Moreover, the molar amount of is obtained from the thickness and the density. Thus, the corrosion charge can be calculated by the loss amount of the electrode. Similarly, in solution, the corrosion percentage is almost 100%.
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