Oxygen vacancy and photoelectron enhanced flexoelectricity in perovskite SrTiO3crystal

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

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1 Citation (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 languageEnglish
Article number164101
JournalApplied Physics Letters
Volume118
Issue number16
DOIs
Publication statusPublished - 19 Apr 2021

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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