Flexoelectric-induced photovoltaic effects and tunable photocurrents in flexible LaFeO3 epitaxial heterostructures
By engineering strain gradients in dielectrics, the flexoelectric effect can be created, which yields interesting physical properties via electromechanical coupling. Here, we report flexoelectric-induced photovoltaic effects in centrosymmetric LaFeO3 thin-film heterostructures grown on flexible mica...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-03-01
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| Series: | Journal of Materiomics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352847821001441 |
| _version_ | 1797721503323652096 |
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| author | Zhizheng Jiang Zhiyu Xu Zhongnan Xi Yihao Yang Ming Wu Yuke Li Xiang Li Qianying Wang Chen Li Di Wu Zheng Wen |
| author_facet | Zhizheng Jiang Zhiyu Xu Zhongnan Xi Yihao Yang Ming Wu Yuke Li Xiang Li Qianying Wang Chen Li Di Wu Zheng Wen |
| author_sort | Zhizheng Jiang |
| collection | DOAJ |
| description | By engineering strain gradients in dielectrics, the flexoelectric effect can be created, which yields interesting physical properties via electromechanical coupling. Here, we report flexoelectric-induced photovoltaic effects in centrosymmetric LaFeO3 thin-film heterostructures grown on flexible mica substrates, in which partial relaxation of lattice-mismatch strain against LaAlO3 stretching layers results in giant strain gradients and pronounced electrical polarizations. The flexoelectric polarization modulates band alignment and leads to significant photovoltaic effects with a short-circuit current density of ∼0.4 mA/cm2 and an open circuit voltage of ∼ -0.45 V in Pt/LaFeO3/LaNiO3 devices. In addition, by concavely/convexly bending the mica substrate, mechanical strain gradients give rise to bi-directionally tunable photocurrents, in which continuously change of short-circuit current density with a magnitude of ∼100% and good reproducibility in repetitive bending operations are observed in the Pt/LaFeO3/LaNiO3 devices. The present work demonstrates an approach to design self-powered photoelectric devices with an electromechanical degree of freedom based on the flexoelectric effect in flexible thin-film heterostructures. |
| first_indexed | 2024-03-12T09:35:13Z |
| format | Article |
| id | doaj.art-869b2d0e449e4e2bb5b4212257456e84 |
| institution | Directory Open Access Journal |
| issn | 2352-8478 |
| language | English |
| last_indexed | 2024-03-12T09:35:13Z |
| publishDate | 2022-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materiomics |
| spelling | doaj.art-869b2d0e449e4e2bb5b4212257456e842023-09-02T13:45:16ZengElsevierJournal of Materiomics2352-84782022-03-0182281287Flexoelectric-induced photovoltaic effects and tunable photocurrents in flexible LaFeO3 epitaxial heterostructuresZhizheng Jiang0Zhiyu Xu1Zhongnan Xi2Yihao Yang3Ming Wu4Yuke Li5Xiang Li6Qianying Wang7Chen Li8Di Wu9Zheng Wen10College of Physics and Center for Marine Observation and Communications, Qingdao University, Qingdao, 266071, ChinaCollege of Physics and Center for Marine Observation and Communications, Qingdao University, Qingdao, 266071, ChinaNational Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, And Department of Materials Science and Engineering, Nanjing University, Nanjing, 210093, ChinaCollege of Physics and Center for Marine Observation and Communications, Qingdao University, Qingdao, 266071, ChinaState Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, Shannxi, 710049, ChinaCollege of Physics and Center for Marine Observation and Communications, Qingdao University, Qingdao, 266071, ChinaCollege of Physics and Center for Marine Observation and Communications, Qingdao University, Qingdao, 266071, ChinaCollege of Physics and Center for Marine Observation and Communications, Qingdao University, Qingdao, 266071, ChinaNational Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, And Department of Materials Science and Engineering, Nanjing University, Nanjing, 210093, ChinaNational Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, And Department of Materials Science and Engineering, Nanjing University, Nanjing, 210093, ChinaCollege of Physics and Center for Marine Observation and Communications, Qingdao University, Qingdao, 266071, China; Corresponding author.By engineering strain gradients in dielectrics, the flexoelectric effect can be created, which yields interesting physical properties via electromechanical coupling. Here, we report flexoelectric-induced photovoltaic effects in centrosymmetric LaFeO3 thin-film heterostructures grown on flexible mica substrates, in which partial relaxation of lattice-mismatch strain against LaAlO3 stretching layers results in giant strain gradients and pronounced electrical polarizations. The flexoelectric polarization modulates band alignment and leads to significant photovoltaic effects with a short-circuit current density of ∼0.4 mA/cm2 and an open circuit voltage of ∼ -0.45 V in Pt/LaFeO3/LaNiO3 devices. In addition, by concavely/convexly bending the mica substrate, mechanical strain gradients give rise to bi-directionally tunable photocurrents, in which continuously change of short-circuit current density with a magnitude of ∼100% and good reproducibility in repetitive bending operations are observed in the Pt/LaFeO3/LaNiO3 devices. The present work demonstrates an approach to design self-powered photoelectric devices with an electromechanical degree of freedom based on the flexoelectric effect in flexible thin-film heterostructures.http://www.sciencedirect.com/science/article/pii/S2352847821001441Flexoelectric effectPhotovoltaic effectStrain gradientFlexible electronicsEpitaxial heterostructures |
| spellingShingle | Zhizheng Jiang Zhiyu Xu Zhongnan Xi Yihao Yang Ming Wu Yuke Li Xiang Li Qianying Wang Chen Li Di Wu Zheng Wen Flexoelectric-induced photovoltaic effects and tunable photocurrents in flexible LaFeO3 epitaxial heterostructures Journal of Materiomics Flexoelectric effect Photovoltaic effect Strain gradient Flexible electronics Epitaxial heterostructures |
| title | Flexoelectric-induced photovoltaic effects and tunable photocurrents in flexible LaFeO3 epitaxial heterostructures |
| title_full | Flexoelectric-induced photovoltaic effects and tunable photocurrents in flexible LaFeO3 epitaxial heterostructures |
| title_fullStr | Flexoelectric-induced photovoltaic effects and tunable photocurrents in flexible LaFeO3 epitaxial heterostructures |
| title_full_unstemmed | Flexoelectric-induced photovoltaic effects and tunable photocurrents in flexible LaFeO3 epitaxial heterostructures |
| title_short | Flexoelectric-induced photovoltaic effects and tunable photocurrents in flexible LaFeO3 epitaxial heterostructures |
| title_sort | flexoelectric induced photovoltaic effects and tunable photocurrents in flexible lafeo3 epitaxial heterostructures |
| topic | Flexoelectric effect Photovoltaic effect Strain gradient Flexible electronics Epitaxial heterostructures |
| url | http://www.sciencedirect.com/science/article/pii/S2352847821001441 |
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