Anomalous circular bulk photovoltaic effect in BiFeO3 thin films with stripe-domain pattern

David S. Knoche, Matthias Steimecke, Yeseul Yun, Lutz Mühlenbein and Akash Bhatnagar ()
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David S. Knoche: Martin-Luther-Universität Halle-Wittenberg
Matthias Steimecke: Martin-Luther-Universität Halle-Wittenberg
Yeseul Yun: Martin-Luther-Universität Halle-Wittenberg
Lutz Mühlenbein: Martin-Luther-Universität Halle-Wittenberg
Akash Bhatnagar: Martin-Luther-Universität Halle-Wittenberg

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Multiferroic bismuth ferrite, BiFeO3, offers a vast landscape to study the interplay between different ferrroic orders. Another aspect which is equally exciting, and yet underutilized, is the possibility of large-scale ordering of domains. Along with symmetry-driven bulk photovoltaic effect, BiFeO3 presents opportunities to conceptualize novel light-based devices. In this work, we investigate the evolution of the bulk photovoltaic effect in BiFeO3 thin films with stripe-domain pattern as the polarization of light is modulated from linear to elliptical to circular. The open-circuit voltages under circularly polarized light exceed ± 25 V. The anomalous character of the effect arises from the contradiction with the analytical assessment involving tensorial analysis. The assessment highlights the need for a domain-specific interaction of light which is further analyzed with spatially-resolved Raman measurements. Appropriate positioning of electrodes allows observation of a switch-like photovoltaic effect, i.e., ON and OFF state, by changing the helicity of circularly polarized light.

Date: 2021
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DOI: 10.1038/s41467-020-20446-z

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