Abstract
Hydrogen photoevolution has been performed using minute platinum (Pt)-island-deposited p-InP electrodes in an HClO4 solution. The photovoltage for the as-prepared electrodes is low, but is increased by about 0.5 V after anodic dissolution. The electrode capacitance is decreased by sweeping the potential in the region where the anodic dissolution occurs, while it is almost unchanged with the potential sweep in the region where dissolution does not occur. These results indicate that the surface states are removed by the anodic dissolution, leading to the increase in the photovoltage. The Mott-Schottky plot is nominally changed by the anodic dissolution, unlike the current-voltage curves. This unusual result can be explained by the presence of high- and low-energy barrier regions in the InP surface before anodic dissolution, the former area being much larger than the latter.
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