Oxygen vacancy and photoelectron enhanced flexoelectricity in perovskite SrTiO3crystal

Yangshi Jin; Fan Zhang; Kai Zhou; Chun Hung Suen; X. Y. Zhou; Ji Yan Dai

doi:10.1063/5.0047735

Oxygen vacancy and photoelectron enhanced flexoelectricity in perovskite SrTiO₃crystal

Yangshi Jin
, Fan Zhang
, Kai Zhou
, Chun Hung Suen
, X. Y. Zhou
, Ji Yan Dai

Research output: Journal article publication › Journal article › Academic research › peer-review

19 Citations (Scopus)

Abstract

Photo-enhanced flexoelectricity or flexoelectricity-enhanced photovoltaic effect, named photo-flexoelectric, is an interesting topic and has application potential in photo-electro-mechanical devices. However, this effect is far from being well understood. In this work, we demonstrate the photoflexoelectric effect in perovskite-structured SrTiO3 (STO) single crystal and reveal the coupling mechanism between its photovoltaic and flexoelectric effect. Driven by the flexoelectric field, light-induced electrons can tunnel through the Schottky junction at the Au/STO interface, giving rise to enhanced flexoelectricity, i.e., photoflexoelectric effect. Thermal annealing in vacuum induces oxygen vacancies in STO and results in stronger light absorption and enlarged photoflexoelectric effect.

Original language	English
Article number	164101
Journal	Applied Physics Letters
Volume	118
Issue number	16
DOIs	https://doi.org/10.1063/5.0047735
Publication status	Published - 19 Apr 2021

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

More information

10.1063/5.0047735

http://hdl.handle.net/10397/95697

Cite this

@article{78516b29bc164f1581f1b529ac69b475,

title = "Oxygen vacancy and photoelectron enhanced flexoelectricity in perovskite SrTiO3crystal",

abstract = "Photo-enhanced flexoelectricity or flexoelectricity-enhanced photovoltaic effect, named photo-flexoelectric, is an interesting topic and has application potential in photo-electro-mechanical devices. However, this effect is far from being well understood. In this work, we demonstrate the photoflexoelectric effect in perovskite-structured SrTiO3 (STO) single crystal and reveal the coupling mechanism between its photovoltaic and flexoelectric effect. Driven by the flexoelectric field, light-induced electrons can tunnel through the Schottky junction at the Au/STO interface, giving rise to enhanced flexoelectricity, i.e., photoflexoelectric effect. Thermal annealing in vacuum induces oxygen vacancies in STO and results in stronger light absorption and enlarged photoflexoelectric effect.",

author = "Yangshi Jin and Fan Zhang and Kai Zhou and Suen, \{Chun Hung\} and Zhou, \{X. Y.\} and Dai, \{Ji Yan\}",

note = "Funding Information: This work was supported by the Hong Kong Research Grants Council (Grant No. PolyU153000/18P) and the National Natural Science Foundation of China (Grant Nos. 11674031 and 11474022). J.Y.D. acknowledge the support by Guangdong-Hong Kong-Macao Joint Laboratory (Grant No. 2019B121205001). Publisher Copyright: {\textcopyright} 2021 Author(s).",

year = "2021",

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doi = "10.1063/5.0047735",

language = "English",

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TY - JOUR

T1 - Oxygen vacancy and photoelectron enhanced flexoelectricity in perovskite SrTiO3crystal

AU - Jin, Yangshi

AU - Zhang, Fan

AU - Zhou, Kai

AU - Suen, Chun Hung

AU - Zhou, X. Y.

AU - Dai, Ji Yan

N1 - Funding Information: This work was supported by the Hong Kong Research Grants Council (Grant No. PolyU153000/18P) and the National Natural Science Foundation of China (Grant Nos. 11674031 and 11474022). J.Y.D. acknowledge the support by Guangdong-Hong Kong-Macao Joint Laboratory (Grant No. 2019B121205001). Publisher Copyright: © 2021 Author(s).

PY - 2021/4/19

Y1 - 2021/4/19

N2 - Photo-enhanced flexoelectricity or flexoelectricity-enhanced photovoltaic effect, named photo-flexoelectric, is an interesting topic and has application potential in photo-electro-mechanical devices. However, this effect is far from being well understood. In this work, we demonstrate the photoflexoelectric effect in perovskite-structured SrTiO3 (STO) single crystal and reveal the coupling mechanism between its photovoltaic and flexoelectric effect. Driven by the flexoelectric field, light-induced electrons can tunnel through the Schottky junction at the Au/STO interface, giving rise to enhanced flexoelectricity, i.e., photoflexoelectric effect. Thermal annealing in vacuum induces oxygen vacancies in STO and results in stronger light absorption and enlarged photoflexoelectric effect.

AB - Photo-enhanced flexoelectricity or flexoelectricity-enhanced photovoltaic effect, named photo-flexoelectric, is an interesting topic and has application potential in photo-electro-mechanical devices. However, this effect is far from being well understood. In this work, we demonstrate the photoflexoelectric effect in perovskite-structured SrTiO3 (STO) single crystal and reveal the coupling mechanism between its photovoltaic and flexoelectric effect. Driven by the flexoelectric field, light-induced electrons can tunnel through the Schottky junction at the Au/STO interface, giving rise to enhanced flexoelectricity, i.e., photoflexoelectric effect. Thermal annealing in vacuum induces oxygen vacancies in STO and results in stronger light absorption and enlarged photoflexoelectric effect.

UR - https://www.scopus.com/pages/publications/85104570133

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DO - 10.1063/5.0047735

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