Topology of the manganite films of the LBMO films with the thicknesses of 1 nm (a) and 15 nm (b). The scale of the image is .
XRD spectra of the LBMO (a) and LCMO (b) films grown on under the same condition as that of LBMO/STON and LCMO/STON. The inset plot in (b) shows the lattice constant of the LCMO film as a function of film thickness.
Semilogarithmic current-voltage characteristics of LBMO/STON with the film thicknesses of 0.5 nm (a), 1 nm (b), and 6 nm (c), measured in the temperature range from 130 to 350 K with a temperature step of 20 K. Solid lines are guides for the eye.
Ideality factor (a) and saturation current (b) as functions of temperature are also presented. Inset plots in (a) and (b) show the ideality factor-film thickness and the interfacial barrier-film thickness relations, respectively. Solid lines are guides for the eye.
Photocurrent as a function of the lateral distance between electrode and laser spot for the LBMO (a) and LCMO (b) junctions, measured at the ambient temperature. The corresponding photovoltage is shown in (c) and (d). The inset pot in (c) shows the relation and in (d) a schematic diagram for the experiment setting. Solid lines are guide for the eye.
Maximal photocurrent as a function of film thickness for the LBMO (a) and LCMO (b) junctions (symbols). For LBMO/STON, other three sets of data collected under the lasers of 660, 780, and 850 nm are also presented, after a proper scaling, for comparison. Solid lines are theoretical results obtained adopting the parameters of and (LBMO) and and (LCMO) for . Results for , which are nearly overlap with that for after adjusting to 1.8 nm (LBMO) and 0.9 nm (LCMO) are presented in the inset plot. The inset in (a) is a semilog plot of the curves. Shaded area marks the difference between the calculated and detected results. Dashed lines in (b) represent the theoretical relations corresponding to diffusion distances marked by the numbers. The corresponding relations are shown in (c) and (d).
Quantum efficiency as a function of photon energy for the typical LBMO/STON junctions of and 2 nm. Solid lines are guides for the eye.
Lateral conductivity of the LBMO (a) and LCMO (b) films, measured at 5 and 296 K. Solid lines are guides for the eye.
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