Abstract
Cobalt-based perovskite-type LaCoO3 epitaxial films, with different thickness (105, 44, 38 and 11 nm), were epitaxially grown on (100) SrTiO3 substrates by polymer assisted deposition. LaCoO3 films have different degree of CoO6 octahedral distortion, i.e., Jahn-Teller-like tetragonal distortion caused by the biaxially tensile strain. The photoconductivity of the LaCoO3 epitaxial films under visible light increases gradually with the decrease of film thickness, accompanied by the increasing of CoO6 octahedral tetragonal distortion. The results reveal that the photoconductive performance of the LaCoO3 epitaxial films is largely related to the biaxially tensile-strained tetragonal distortion of CoO6. Higher degree of tetragonal distortion corresponds to smaller value of crystal field splitting energy as well as the band gap, which is beneficial to photoconductivity.
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