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Boosting piezoelectricity under illumination via the bulk photovoltaic effect and the Schottky barrier effect in BiFeO 3
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Heo, Yooun and Alexe, Marin (2022) Boosting piezoelectricity under illumination via the bulk photovoltaic effect and the Schottky barrier effect in BiFeO 3. Advanced Materials, 34 (5). 2105845. doi:10.1002/adma.202105845 ISSN 1521-4095.
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Official URL: https://doi.org/10.1002/adma.202105845
Abstract
Piezoelectricity is a key functionality induced by conversion between mechanical and electrical energy. Enhancement of piezoelectricity in ferroelectrics often has been realized by complicated synthetical approaches to host unique structural boundaries, so-called morphotropic phase boundaries. While structural approaches have been well-known, enhancing piezoelectricity by external stimuli has yet to be clearly explored despite their advantages of offering not only simple and in-situ control without any prior processing requirement, but compatibility with other functionalities. Here, we show that light is a powerful control parameter to enhance the piezoelectric property of a BiFeO3 single crystal. Our series of PFM and C-AFM based measurements under illumination reveal a locally enhanced effective piezoelectric coefficient, dzz, eventually showing almost a seven-fold increase. We explain this phenomenon with theoretical models by introducing the two main underlying mechanisms attributed to the bulk photovoltaic effect and Schottky barrier effect, involving the role of open circuit voltage and photocharge carrier density. These results provide key insights to light-induced piezoelectricity enhancement, offering its potential for multifunctional optoelectronic devices.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
SWORD Depositor: | Library Publications Router | |||||||||
Library of Congress Subject Headings (LCSH): | Piezoelectricity, Photovoltaic effect, Diodes, Schottky-barrier | |||||||||
Journal or Publication Title: | Advanced Materials | |||||||||
Publisher: | Wiley | |||||||||
ISSN: | 1521-4095 | |||||||||
Official Date: | 3 February 2022 | |||||||||
Dates: |
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Volume: | 34 | |||||||||
Number: | 5 | |||||||||
Article Number: | 2105845 | |||||||||
DOI: | 10.1002/adma.202105845 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 30 November 2021 | |||||||||
Date of first compliant Open Access: | 11 November 2022 | |||||||||
RIOXX Funder/Project Grant: |
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