期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-020-20446-z
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资金
- Bundesministerium fur Bildung und Forschung (BMBF) [03Z22HN12]
- Deutsche Forschungsgemeinschaft (DFG) within Sonderforschungsbereiche (SFB) 762
- Europaischen Fonds fur regionale Entwicklung (EFRE) Sachsen-Anhalt
This study investigates the evolution of bulk photovoltaic effect in BiFeO3 thin films under different polarization conditions, revealing anomalous characteristics in open-circuit voltages under circularly polarized light. Spatially-resolved Raman measurements further analyze the interaction between light and different domains.
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.
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