Abstract
By employing conductive and transparent La0.07Ba0.93SnO3 (LBSO) films as bottom electrodes, epitaxial BiFe0.95Mn0.05O3 (BFMO) ferroelectric capacitors were fabricated on SrTiO3(001) [STO(001)] substrates by pulsed laser deposition method. The LBSO films showed an excellent optical transmittance in the visible range and a weak metallic conductive behavior, with the room-temperature resistivity, carrier concentration, and mobility of 1.223mΩcm, 5.54×1021cm−3, and 0.923cm2/Vs, respectively. X-ray photoelectron spectroscopy and X-ray absorption near-edge structure spectra analysis revealed that iron ions were present primarily as Fe3+ in BFMO films. The band gap of BFMO films was determined to be 2.63eV from the optical transmittance of the BFMO/LBSO/STO(001) heterostructures. Pt/BFMO/LBSO/STO(001) structured ferroelectric thin-film capacitors showed well-saturated rectangular-shaped polarization–electric field hysteresis loops with the remanent polarization of 45μC/cm2 at a measurement frequency of 1kHz, indicating that the perovskite-type LBSO films can be potentially used in transparent devices especially based on all-perovskite heterostructures.
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