Remarkable plasticity and softness of polymorphic InSe van der Waals crystals

Yupeng Ma; Haoran Huang; Yifei Liu; Heyang Chen; Xudong Bai; Kunpeng Zhao; Min Jin; Tian-Ran Wei; Xun Shi

Journal of Materiomics (Jul 2023)

Remarkable plasticity and softness of polymorphic InSe van der Waals crystals

Yupeng Ma,
Haoran Huang,
Yifei Liu,
Heyang Chen,
Xudong Bai,
Kunpeng Zhao,
Min Jin,
Tian-Ran Wei,
Xun Shi

Affiliations

Yupeng Ma: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Haoran Huang: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Yifei Liu: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Heyang Chen: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Xudong Bai: Wuzhen Laboratory, Tongxiang, 314500, China
Kunpeng Zhao: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Wuzhen Laboratory, Tongxiang, 314500, China
Min Jin: College of Materials, Shanghai Dianji University, Shanghai 201306, China
Tian-Ran Wei: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Wuzhen Laboratory, Tongxiang, 314500, China; Corresponding author. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Xun Shi: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; Corresponding author. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute ofCeramics, Chinese Academy of Sciences, Shanghai 200050, China.

Journal volume & issue: Vol. 9, no. 4
pp. 709 – 716

Abstract

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Indium selenide (InSe) crystals are reported to show exceptional plasticity, a new property to two-dimensional van der Waals (2D vdW) semiconductors. However, the correlation between plasticity and specific prototypes is unclear, and the understanding of detailed plastic deformation mechanisms is inadequate. Here three prototypes of InSe are predicted to be plastically deformable by calculation, and the plasticity of polymorphic crystals is verified by experiment. Moreover, distinct nanoindentation behaviors are seen on the cleavage and cross-section surfaces. The modulus and hardness of InSe are the lowest ones among a large variety of materials. The plastic deformation is further perceived from chemical interactions during the slip process. Particularly for the cross-layer slip, the initial In-Se bonds break while new In-In and Se-Se bonds are newly formed, maintaining a decent interaction strength. The remarkable plasticity and softness alongside the novel physical properties, endow InSe great promise for application in deformable and flexible electronics.

Published in Journal of Materiomics

ISSN: 2352-8478 (Print); 2352-8486 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.sciencedirect.com/journal/journal-of-materiomics

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