Structural and photoelectric properties of tensile strainedBiFeO3

Abstract

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Bulk-Controlled Photovoltaic Effect in Nanometer-Thick Ferroelectric Pb(Zr0.2Ti0.8)O3 Thin Films and the Role of Domain Walls

“…Interestingly, J SC acquired from thinner samples, although largely similar across the entire range of temperatures, approaches depreciated values as the temperature is lowered. A similar trend has also been reported in BiFeO 3 42 and in molecular ferroelectrics wherein J SC dropped to values close to zero at low temperatures. 39 In the case of molecular ferroelectrics, the overall J SC response was found to be in good agreement with temperature-dependent thermionic emission, which is suppressed at low temperature by the resistance of the Schottky-barrier at the electrode-ferroelectric interface.…”

“…The thinner samples exhibit values close to 0 at low temperatures while a steady increment is observed in the thicker samples with V OC of around 2.2 V at around 100 K in ≈706 nm sample. Such an increase in V OC upon lowering of temperature has also been reported in BiFeO 3 , albeit in planar geometries, with the BPV effect as the possible origin. , …”

“…Such an increase in V OC upon lowering of temperature has also been reported in BiFeO 3 , albeit in planar geometries, with the BPV effect as the possible origin. 4,42 Few issues become rather apparent from the temperaturedependent analysis of photoelectrical characteristics. (1) The analysis of the conductivities (σ d and σ ph ) suggests a bulkdominated conduction in all the samples, with thinner samples clearly more conductive than the thicker samples.…”

Brief Theoretical Overview of Bi-Fe-O Based Thin Films

“…Strain of BFO film could potentially provide enhanced photoconductivity and control over photovoltaic effect of the final film. For example, strained BFO material on LAO [41] exhibits enhanced photoconductivity [42].…”

Magneto–Electric–Optical Coupling in Multiferroic BiFeO3‐Based Films

“…Polar heterointerfaces, La doping, strain and electric field have been reported to effectively modulate the magnetoelectric coupling in BFO-based systems. [17,18] Furthermore, the BFO films have been revealed to display the prominent photoresponse behaviors, [19][20][21][22] such as the switchable photoelectric responses, [23] continuously controllable photoconductance [24] and above-bandgap photovoltages. [3] In addition, BFO displays multiple adjustable polarization variants and flexible domain structures, [25][26][27][28][29] suggesting the feasibility of ferroelastic switching.…”