(a) XRD diffraction pattern of the heterostructure. (b) Out-of-plane PFM image of the BFO film.
Current-voltage curves of the heterostructure at different temperatures (80 K-300 K). Solid lines are fitting curves, which is described by the exponential relation I ∝ exp (qV/nkT). The inset shows the schematic circuit of the heterostructure.
The time dependence of photovoltages in the heterostructure at different temperatures. The inset displays the relationship between the peak photovoltages and temperatures.
The photovoltages of the heterostructures under the excitation of a laser with different power density at T = 300 K. The inset shows the peak photovoltages as a function of the power density.
The energy band diagram of the heterostructure under the irradiations.
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