Electric control of oxygen vacancies in homo-ferroelectric-domain BiFeO3

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-03-24 DOI:10.1063/5.0253399

Xi Shen, Qinwen Guo, Xianghan Xu, Xiangfei Li, Ying Meng, Luyao Wang, Haoyu Zhuang, Richeng Yu, Sang-Wook Cheong

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引用次数: 0

Abstract

Although the performance of BiFeO3 (BFO) films has been extensively and deeply studied, further exploration is still needed to understand the correlation between a ferroelectric single domain and high performance in BFO single crystals. Therefore, we conduct the biased in situ transmission electron microscopy experiments on the electrical transport properties of BFO single crystals with single domains. The in situ measured I–V curves indicate neither one-way conduction nor resistance switching. The conductive behavior of BFO corresponds to space charge-limited conduction, indicating a high concentration of oxygen vacancies and the presence of Ohmic contact between the Pt electrode and BFO. After applying a DC constant voltage, the resistance decreases by approximately 50% and partially recovers after exposure to air. The electron energy loss spectroscopy spectra under different conditions indicate that BFO interacts with the external environment. Specifically, DC voltage causes BFO to release oxygen atoms, resulting in an increase in oxygen vacancy concentration and decrease in resistance. Air oxidation leads to a decrease in oxygen vacancy concentration and partial recovery of resistance. In addition, in situ heating experiments (at 20–400 °C) indicate that oxygen vacancies mainly originate from the external electric field rather than thermal effects.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.