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Enhancement of local photovoltaic current at ferroelectric domain walls in BiFeO3
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Yang, Ming-Min, Bhatnagar, Akash, Luo, Zhengdong and Alexe, M. (Marin) (2017) Enhancement of local photovoltaic current at ferroelectric domain walls in BiFeO3. Scientific Reports, 7 . 43070. doi:10.1038/srep43070 ISSN 2045-2322.
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Official URL: https://doi.org/10.1038/srep43070
Abstract
Domain walls, which are intrinsically two dimensional nano-objects exhibiting nontrivial electronic and magnetic behaviours, have been proven to play a crucial role in photovoltaic properties of ferroelectrics. Despite this recognition, the electronic properties of domain walls under illumination until now have been accessible only to macroscopic studies and their effects upon the conduction of photovoltaic current still remain elusive. The lack of understanding hinders the developing of nanoscale devices based on ferroelectric domain walls. Here, we directly characterize the local photovoltaic and photoconductive properties of 71° domain walls on BiFeO3 thin films with a nanoscale resolution. Local photovoltaic current, proven to be driven by the bulk photovoltaic effect, has been probed over the whole illuminated surface by using a specially designed photoelectric atomic force microscopy and found to be significantly enhanced at domain walls. Additionally, spatially resolved photoconductive current distribution reveals a higher density of excited carriers at domain walls in comparison with domains. Our measurements demonstrate that domain wall enhanced photovoltaic current originates from its high conduction rather than the internal electric field. This photoconduction facilitated local photovoltaic current is likely to be a universal property of topological defects in ferroelectric semiconductors.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Library of Congress Subject Headings (LCSH): | Ferroelectric crystals, Ferroelectric thin films, Photovoltaic effect, Domain structure, Bismuth compounds | ||||||
| Journal or Publication Title: | Scientific Reports | ||||||
| Publisher: | Nature Publishing Group | ||||||
| ISSN: | 2045-2322 | ||||||
| Official Date: | 20 February 2017 | ||||||
| Dates: |
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| Volume: | 7 | ||||||
| Article Number: | 43070 | ||||||
| DOI: | 10.1038/srep43070 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Date of first compliant deposit: | 16 October 2017 | ||||||
| Date of first compliant Open Access: | 18 October 2017 | ||||||
| Funder: | Royal Society (Great Britain). Wolfson Research Merit Award (RSWRMA), University of Warwick Chancellor's Scholarship |
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