Controlling transport properties at LaFeO₃/SrTiO₃ interfaces by defect engineering

Abstract

The formation of conductive LaFeO3/SrTiO3 interfaces is first time reported by pulsed laser deposition via controlling the defects of SrTiO3, which are closely related to the surface of substrate. It is found that the interfaces grown on SrTiO3 substrates without terraces exhibit the two dimensional electron gas. Moreover, the conductive interfaces show a resistance upturn at low temperatures which is strongly diminished by light irradiation. These interfaces favor the persistent photoconductivity, and the enormous value of relative change in resistance, about 60 185.8%, is also obtained at 20 K. The experimental results provide fundamental insights into controlling the defects at conductive interfaces of oxides and paving a way for complex-oxides based optoelectronic devices.

Effect of Light and Electrostatic Gate at Oxide Interface LaFeO3–SrTiO3 at Room Temperature

“…b) For different interfaces (the red patch represents the STO‐based interface and the blue patch represents the KTO‐based interface). [ 12,13,15,23–26 ] .…”

“…Our observation suggests a correlation between the product of carrier density and mobility with photoconductivity, photoconductivity increases with decreasing the product. Enhanced resistance change has been observed under the simultaneous application of red [12,13,15,[23][24][25][26] .…”

“…Percentage change in resistance as a function of carrier density a) for different thicknesses of LFO thin film. b) For different interfaces (the red patch represents the STO-based interface and the blue patch represents the KTO-based interface) [12,13,15,[23][24][25][26]. .…”

The modulated oxygen evolution reaction performance of LaFeO3 with abundant electronic structures via a design of stoichiometry offset

“…1(a) and (b) show the XRD patterns of LFO films under different oxygen pressures; all the films are epitaxially grown along the (001) crystal direction. 14,15 It can be seen in Fig. 1(b) that with the decrease in oxygen pressure, the strongest diffraction peak (002) shifts to a smaller angle implying the lattice gradually expands with the introduced oxygen vacancies (images of all samples fabricated under different oxygen atmospheres are shown in Fig.…”