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Zhang et al. Microstructures 2023;3:2023010 Microstructures
DOI: 10.20517/microstructures.2022.39

Research Article Open Access

Elastic properties and Ion-mediated domain

switching of self-assembled heterostructures CuInP 2
S -In P S 6
4/3
2
6
1,#
1
1,#
1
1
1
1
Xiangping Zhang , Xingan Jiang , Guoshuai Du , Qi Ren , Wenfu Zhu , Jiaqian Kang , Yingzhuo Lun ,
1
1
1
3
1,2
Tingjun Wang , Bofang Bai , Zixuan Yu , Jianming Deng , Yabin Chen , Xueyun Wang 1 , Jiawang Hong 1
1
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China.
2
Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices, Huizhou University, Huizhou 516001,
Guangdong, China.
3
Advanced Research Institute of Multidisciplinary Sciences, and School of Materials Science and Engineering, Beijing Institute of
Technology, Beijing 100081, China.
#
These authors contribute equally to this work.
Correspondence to: Prof./Dr. Xueyun Wang, School of Aerospace Engineering, Beijing Institute of Technology, #5
ZhongGuanCun South Street, Beijing 100081, China. E-mail: xueyun@bit.edu.cn; Prof./Dr. Jiawang Hong, School of Aerospace
Engineering, Beijing Institute of Technology, #5 ZhongGuanCun South Street, Beijing 100081, China. E-mail: hongjw@bit.edu.cn
How to cite this article: Zhang X, Jiang X, Du G, Ren Q, Zhu W, Kang J, Lun Y, Wang T, Bai B, Yu Z, Deng J, Chen Y, Wang X,
Hong J. Elastic properties and Ion-mediated domain switching of self-assembled heterostructures CuInP S -In P S .
2 6 4/3 2 6
Microstructures 2023;3:2023010. https://dx.doi.org/10.20517/microstructures.2022.39
Received: 2 Nov 2022 First Decision: 2 Dec 2022 Revised: 8 Dec 2022 Accepted: 4 Jan 2023 Published: 17 Jan 2023
Academic Editor: Shujun Zhang Copy Editor: Fangling Lan Production Editor: Fangling Lan
Abstract
Van der Waals (vdW) ferroelectric CuInP S (CIPS) has attracted intense research interest due to its unique
2
6
ferroelectric properties that make it promising for potential applications in flexible electronic devices. A mechanical
mean, or so-called strain gradient engineering, has been proven as an effective method to modulate its ferroelectric
properties, but the key parameter elastic constants Cij has not been accurately measured. Here, we utilized
nanoindentation and contact resonance atomic force microscopy (CR-AFM) techniques to measure the elastic
modulus on the (001) plane of nanoscale phase separated CuInP S -In P S (CIPS-IPS). The Young’s modulus of
2 6
4/3
2
6
the CIPS was slightly less than that of the IPS. Density Functional Theory was introduced to obtain the accurate full
elastic constant Cij of CIPS and IPS, and we deduced their respective Young’s moduli, all of which are in good
agreement with our experimental values. We further discovered the asymmetrical domain switching and proposed
an ion-mediated domain switching model. The results provide a reliable experimental reference for strain gradient
engineering in the phase field simulation in CIPS-IPS.

© The Author(s) 2023. Open Access This article is licensed under a Creative Commons Attribution 4.0
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