Defect and Strain Engineering Coenhanced Nanoscale Ferroelectricity in SrTiO3 Thin Films

IF 15.8 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

ACS Nano Pub Date : 2025-03-26 DOI:10.1021/acsnano.5c03518

Chao Chen, Caiwen Li, Jiangxiao Li, Han Gao, Jingtian Zhou, Zhen Wang, Xiangbin Cai, Guofeng Liang, Xiaozhe Yin, Zhibang Shen, Jinhui Yu, Zedong Xu, Minghui Qin, Xubing Lu, Lang Chen, Ning Wang, Ye Zhu, Yu Chen, Guofu Zhou, Xingsen Gao, Yibo Han, Zhenlin Luo, Jun-Ming Liu, Deyang Chen

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引用次数: 0

Abstract

Tensile biaxial strain has been demonstrated to induce in-plane ferroelectricity in SrTiO₃ thin films at room temperature. However, out-of-plane ferroelectricity is more favorable for electronic device applications. Here, we report the achievement of room-temperature out-of-plane ferroelectric SrTiO₃ thin films with giant tetragonality (c/a ∼ 1.061) and an ultrahigh ferroelectric stablity temperature (>1000 K) through epitaxial strain and defect engineering. Optical second-harmonic generation (SHG) proves that the enhancement of tetragonality enables improved ferroelectricity. Moreover, a combination of scanning transmission electron microscopy (STEM) and X-ray absorption near-edge spectroscopy (XANES) reveals the origin of enhanced tetragonality and strong ferroelectricity in defect- and strain-codriven supertetragonal SrTiO₃ thin films. Our findings present an approach to material design that can be extended to other material systems for the enhancement of ferroelectricity and the observation of emergent phenomena.

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来源期刊

ACS Nano 工程技术-材料科学：综合

CiteScore

26.00

自引率

4.10%

发文量

1627

审稿时长

1.7 months

期刊介绍： ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.