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013ChemInform Abstract It is demonstrated that the NiO(OH) film exhibits p/n semiconductivity, sensitivity to light, and photoelectrocatalytic activity for the O2 evolution reaction. NiO(OH) protects epitaxial n-Si from photopassivation. The oxygen evolution rate at n-Si with p/n or n+/n junction electrodes coated with NiO(OH) reaches 160 mA/cm2 under a light intensity of 80 mW/cm2 and the photocurrent at constant potential is quite stable. The difference in the photocurrent density at the same potential on the n+/Si/NiO(OH) and n+/p-Si/NiO(OH) anodes implies that the solid junction intensifies the separation of electron-hole pairs and hence accelerate the oxygen evolution reaction.

We present a study of the Cerenkov configuration second harmonic generation in X-cut ion-implanted lithium niobate waveguides. An approximate solution of conversion efficiency is given and plotted which shows that it is very sensitive to the waveguide depth and pump wavelength. The results can be used in the design of waveguides for the efficient second harmonic generation in the Cerenkov configuration.

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