期刊
APPLIED MATERIALS TODAY
卷 25, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apmt.2021.101244
关键词
Core-shell heterostructure; Stress engineering; Strongly correlated materials; Vanadium dioxide; Metal-insulator phase transition
资金
- Korea Basic Science Institute (KBSI) [D110500, C140700]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1A2C1007883, 2017M3A7B4049173]
- National Research Council of Science & Technology (NST), Republic of Korea [D110500, C140700] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, stress engineering on MIT in VO2 nanobeams is achieved through core-shell heterostructures, enabling uniform axial stress distribution and control of phase transition pathways. This research can lead to better engineering of phase transitions in strongly correlated materials, providing the beneficial effect of suppressing inhomogeneities during the MIT process.
In strongly correlated materials (SCMs), especially for vanadium dioxide (VO2), manipulating physical properties through stress engineering is an important issue for the use of ultrafast metal-insulator transition (MIT) in device applications. Recent research efforts have mainly focused on modulation and related phenomena of physical properties by epitaxial and mechanical stresses in VO2 films or anisotropic nanocrystals. However, inhomogeneous stress in such planar and nanocrystal systems leads to complications induced by phase competitions or the creation of intermediate phases. Here, we demonstrate the core-shell heterostructures-enabled stress engineering on MIT, which provides accommodation of uniform axial stress and control of phase transition pathways in VO2 nanobeams. Specifically, the VO2 nanobeams with an amorphous Al2O3 shell undergo a simple and direct MIT at lower temperatures without intermediate phases, distinctly different from pristine nanobeams with coexisting phases. For the core-shell nanobeams, the VO2 core sustains a uniform compressive stress state along the nanobeam length caused by shell formation, which can be attributed to the different thermal behaviors coupled to the elastic modulus between the VO2 and shell. Our results can lead to better engineering of phase transitions in SCMs, providing the beneficial effect of suppressing inhomogeneities during the MIT process. (C) 2021 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据