Oxygen-Valve Formed in Cobaltite-Based Heterostructures by Ionic Liquid and Ferroelectric Dual-Gating

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Youdi Gu
  • Kun Xu
  • Cheng Song
  • Hongrui Zhang
  • Haijun Mao
  • Muhammad Shahrukh Saleem
  • Jirong Sun
  • Wei Liu
  • Zhidong Zhang
  • Feng Pan
  • Jing Zhu

Detail(s)

Original languageEnglish
Pages (from-to)19584-19595
Journal / PublicationACS Applied Materials and Interfaces
Volume11
Issue number21
Online published6 May 2019
Publication statusPublished - 29 May 2019
Externally publishedYes

Abstract

Manipulation of oxygen vacancies via electric-field-controlled ionic liquid gating has been reported in many model systems within the emergent fields of oxide electronics and iontronics. It is then significant to investigate the oxygen vacancy formation/annihilation and migration across an additional ferroelectric layer with ionic liquid gating. Here, we report that via a combination of ionic liquid and ferroelectric gating, the remote control of oxygen vacancies and magnetic phase transition can be achieved in SrCoO2.5 films capped with an ultrathin ferroelectric BaTiO3 layer at room temperature. The ultrathin BaTiO3 layer acts as an atomic oxygen valve and is semitransparent to oxygen-ion transport due to the competing interaction between vertical electron tunneling and ferroelectric polarization plus surface electrochemical changes in itself, thus resulting in the striking emergence of new mixed-phase SrCoOx. The lateral coexistence of brownmillerite phase SrCoO2.5 and perovskite phase SrCoO3-δ was directly observed by transmission electron microscopy. Besides the fundamental significance of long-range interaction in ionic liquid gating, the ability to control the flow of oxygen ions across the heterointerface by the oxygen valve provides a new approach on the atomic scale for designing multistate memories, sensors, and solid-oxide fuel cells.

Research Area(s)

  • ferroelectric polarization, ionic liquid gating, oxygen vacancies, oxygen valve, phase transition

Citation Format(s)

Oxygen-Valve Formed in Cobaltite-Based Heterostructures by Ionic Liquid and Ferroelectric Dual-Gating. / Gu, Youdi; Xu, Kun; Song, Cheng; Zhong, Xiaoyan; Zhang, Hongrui; Mao, Haijun; Saleem, Muhammad Shahrukh; Sun, Jirong; Liu, Wei; Zhang, Zhidong; Pan, Feng; Zhu, Jing.

In: ACS Applied Materials and Interfaces, Vol. 11, No. 21, 29.05.2019, p. 19584-19595.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal