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Elastic properties and Ion-mediated domain switching of self-assembled heterostructures CuInP2S6-In4/3P2S6
Xiangping Zhang
Xingan Jiang
Guoshuai Du
Qi Ren
Wenfu Zhu
Jiaqian Kang
Yingzhuo Lun
Tingjun Wang
Bofang Bai
Zixuan Yu
Jianming Deng
Yabin Chen
Xueyun Wang
Jiawang Hong
出版
OAE Publishing Inc.
, 2023-01-17
主題
Technology & Engineering / Materials Science / General
URL
http://books.google.com.hk/books?id=a9cEEQAAQBAJ&hl=&source=gbs_api
EBook
SAMPLE
註釋
Van der Waals (vdW) ferroelectric CuInP2S6 (CIPS) has attracted intense research interest due to its unique 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 CuInP2S6-In4/3P2S6 (CIPS-IPS). The Young’s modulus of 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.