Wide band gap tunability in complex transition metal oxides by site-specific substitution

Abstract

Fabricating complex transition metal oxides with a tuneable band gap without compromising their intriguing physical properties is a longstanding challenge. Here we examine the layered ferroelectric bismuth titanate and demonstrate that, by site-specific substitution with the Mott insulator lanthanum cobaltite, its band gap can be narrowed as much as one electron volt, while remaining strongly ferroelectric. We find that when a specific site in the host material is preferentially substituted, a split-off state responsible for the band gap reduction is created just below the conduction band of bismuth titanate. This provides a route for controlling the band gap in complex oxides for use in emerging oxide opto-electronic and energy applications.

References in corpus (2)

• Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures
• Dimensional crossover of polaron dynamics in Nb:SrTiO3/SrTiO3 superlattices: Possible mechanism of thermopower enhancement

Cited by in corpus (15)

• Perovskites for Solar and Thermal Energy Harvesting: State of the Art Technologies, Current Scenario and Future Directions
• Photoferroelectric oxides
• First-Principles Calculation of the Bulk Photovoltaic Effect in KNbO${}_3$ and (K,Ba)(Ni,Nb)O${}_{3-\delta }$
• Electron-Hole Separation in Ferroelectric Oxides for Efficient Photovoltaic Responses
• Band gap tuning in ferroelectric Bi4Ti3O12 by alloying LaTMO3 (TM = Ti, V, Cr, Mn, Co, Ni, and Al)
• Density Functional Theory Study Of Hypothetical PbTiO3-Based Oxysulfides
• Strain tuning of electronic structure in Bi4Ti3O12-LaCoO3 epitaxial thin films
• Effect of Site-disorder, Off-stoichiometry and Epitaxial Strain on the Optical Properties of Magnetoelectric Gallium Ferrite
• Visible light carrier generation in co-doped epitaxial titanate films
• Tunable Band gap of Iron-Doped Lanthanum-Modified Bismuth Titanate Synthesized by the Thermal Decomposition of a Secondary Phase
• Multi-Fields Modulation of Physical Properties of Oxide Thin Films
• Optoionic Impedance Spectroscopy (OIS): a model-less technique for in-situ electrochemical characterization of mixed ionic electronic conductors
• New class of planar ferroelectric Mott insulators via first principles design
• Optical Anisotropy in Bismuth Titanate: An Experimental and Theoretical Study
• Intrinsic inverse band gap versus polarization relation in ferroelectric materials