Successive redox-mediated visible-light ferrophotovoltaics

Yuji Noguchi (), Yuki Taniguchi, Ryotaro Inoue and Masaru Miyayama
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Yuji Noguchi: The University of Tokyo
Yuki Taniguchi: The University of Tokyo
Ryotaro Inoue: Nihon University
Masaru Miyayama: The University of Tokyo

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Titanium oxide materials have multiple functions such as photocatalytic and photovoltaic effects. Ferroelectrics provide access to light energy conversion that delivers above-bandgap voltages arising from spatial inversion symmetry breaking, whereas their wide bandgap leads to poor absorption of visible light. Bandgap narrowing offers a potential solution, but this material modification suppresses spontaneous polarization and, hence, sacrifices photovoltages. Here, we report successive-redox mediated ferrophotovoltaics that exhibit a robust visible-light response. Our single-crystal experiments and ab initio calculations, along with photo-luminescence analysis, demonstrate that divalent Fe2+ and trivalent Fe3+ coexisted in a prototypical ferroelectric barium titanate BaTiO3 introduce donor and acceptor levels, respectively, and that two sequential Fe3+/Fe2+ redox reactions enhance the photogenerated power not only under visible light but also at photon energies greater than the bandgap. Our approach opens a promising route to the visible-light activation of photovoltaics and, potentially, of photocatalysts.

Date: 2020
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DOI: 10.1038/s41467-020-14763-6

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