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Unpolarized and polarized Raman spectra (200-800 cm-1) of with a layered rock-salt structure were LiCoO 2 measured. The Raman-active lattice modes of were assigned by polarized Raman measurements of a LiCoO 2 c-axis oriented thin Ðlm. The variation of the Raman spectra of powder prepared by electrochemical Li 1-x CoO 2 lithium deintercalation was investigated, and the spectral changes were well correlated with the structural changes determined by x-ray di †raction except that peak splitting by the distortion in the monoclinic phase was not observed. The observed line broadening of the second hexagonal phase and the monoclinic phase indicated that the lithium ions remaining in the lattice after deintercalation randomly occupy the available sites on the lithium planes in the lattice the layered rock-salt structure.

Polycrystalline n-ZnO/p-Cu2O heterojunctions have been fabricated by low-temperature eletrodepositions of ZnO and Cu2O layers in aqueous solutions. The condition for forming the Cu2O layer significantly reflected the electrical rectification characteristic and the photovoltaic performance, and the heterojunction fabricated under optimized conditions showed an excellent electrical rectification characteristic and a photovoltaic performance of 1.28% in conversion efficiency under an AM 1.5 illumination.

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