Effects of oxygen stoichiometry on the photovoltaic properties of La0.4Ca0.6MnO3-δ epitaxial films grown on miscut MgO substrates

We report the effects of lattice constants variation induced by oxygen stoichiometry on the photoresponse properties of La
_0.4
Ca
_0.6
MnO
_3-δ
epitaxial films grown on miscut MgO substrates. The oxygen content was changed by annealing the sample in oxygen and vacuum. With the decreases of oxygen deficiencies, the electrical conductivity and the diffraction peak [101] of the film increase. It is found that the photovoltage and photocurrent decrease monotonously as the oxygen contents decrease.