Ferroelectricity in layered bismuth oxide down to 1 nanometer

Qianqian Yang, Jingcong Hu, Yue Wen Fang, Yueyang Jia, Rui Yang, Shiqing Deng, Yue Lu*, Oswaldo Dieguez, Longlong Fan, Dongxing Zheng, Xixiang Zhang, Yongqi Dong, Zhenlin Luo, Zhen Wang, Huanhua Wang, Manling Sui, Xianran Xing, Jun Chen, Jianjun Tian*, Linxing Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Atomic-scale ferroelectrics are of great interest for high-density electronics, particularly field-effect transistors, low-power logic, and nonvolatile memories. We devised a film with a layered structure of bismuth oxide that can stabilize the ferroelectric state down to 1 nanometer through samarium bondage. This film can be grown on a variety of substrates with a cost-effective chemical solution deposition. We observed a standard ferroelectric hysteresis loop down to a thickness of ~1 nanometer. The thin films with thicknesses that range from 1 to 4.56 nanometers possess a relatively large remanent polarization from 17 to 50 microcoulombs per square centimeter. We verified the structure with first-principles calculations, which also pointed to the material being a lone pair–driven ferroelectric material. The structure design of the ultrathin ferroelectric films has great potential for the manufacturing of atomic-scale electronic devices.

Original languageEnglish
Pages (from-to)1218-1224
Number of pages7
JournalScience
Volume379
Issue number6638
DOIs
StatePublished - 24 Mar 2023

Funding

FundersFunder number
Beijing Innovation Team Building ProgramIDHT20190503
Lingang Laboratory Open Research FundLG-QS-202202-11
Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering2022SX-TD001
National Natural Science Foundation of China11704041, 12074016, 51774034, 22090042, 62104140, 51961135107, 12175235, 12274009, 21801013
National Natural Science Foundation of China
Chinese Academy of Sciences
Beijing Municipal Commission of EducationKM202110005003
Beijing Municipal Commission of Education
Tokyo Institute of Technology
Natural Science Foundation of Beijing MunicipalityZ210016
Natural Science Foundation of Beijing Municipality
China Academy of Space Technology2019-2021QNRC
China Academy of Space Technology
National Key Research and Development Program of China2017YFE0119700, 2020YFA0406202, 2018YFA0703700
National Key Research and Development Program of China
Fundamental Research Funds for the Central UniversitiesFRF-TP-19-055A2Z, FRF-IDRY-19-007
Fundamental Research Funds for the Central Universities
National Program for Support of Top-notch Young Professionals

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