期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 925, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.166606
关键词
Perovskite; Dielectric; Atomic modification; Nanosheet; Chemical exfoliation
资金
- Korea Institute of Science and Technology Future Resource Program [2021R1A2C2010695]
- National Research Foundation of Korea (NRF) grant - Korea government [2020R1A6A3A01098488]
- [2E31771]
- National Research Foundation of Korea [2021R1A2C2010695, 2020R1A6A3A01098488] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study proposes a new material design route to achieve high permittivity behavior in atomically thin films. By ion exchange and chemical exfoliation, thin films with high dielectric permittivity are obtained. This provides a strategy for obtaining new high-k nanoscale dielectrics in the field of nanoelectronics.
The search for new high-performance dielectric materials has attracted considerable research interest. Several mechanisms to achieve high permittivity have been proposed, such as BaTiO3-based perovskites or CaCu3Ti4O12. However, developing high-performance thin films remains a challenge. Here, we propose a new material design route to achieve high permittivity behavior in atomically thin films. We present a concrete example of Dion-Jacobson-type KSr2-xBixNb3O10 and its cation-exchanged form HSr2-xBixNb3O10, which exhibits a stable colossal permittivity and low dielectric loss. In addition, Sr2(1-x)Bi2xNb3O10-delta na-nosheets were obtained by chemical exfoliation, with a high dielectric permittivity of over 50 0-the highest among all known dielectrics in ultrathin films (< 20 nm). The Bi substitution of Sr2Nb3O10 led to a two-fold increase in the dielectric permittivity owing to the higher polarizability of Bi ions. Our proposed method provides a strategy for obtaining new high-k nanoscale dielectrics for use in nanoscaled electronics.(c) 2022 Published by Elsevier B.V.
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