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

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

2012-02-21

arxiv.org/abs/1202.4785v1

Nature Communications 3, 689 (2012)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1038/ncomms1690

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.

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