Abstract
The photovoltaic effect (PVE) of a heterojunction composed of a La0.7Ce0.3MnO3 (LCE) film and a 0.5wt.% Nb-doped SrTiO3 crystal has been experimentally studied. A strong PVE was observed, and the maximum photovoltage was ∼54.1mV, when the LCE film was exposed to light with a wavelength (λ) of 460nm and a power of ∼6.5μW. The PVE remains significant up to λ=660nm, though it decreases gradually with the increase of wavelength. Oxygen release of the LCE film depresses the PVE considerably and modifies the rectifying property of the junction. A logarithmic variation of photovoltage with junction resistance was observed. The weakening of the ferromagnetic order of the LCE film due to the incorporation of oxygen vacancies may be the reason for the depression of the PVE.
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