具有高度面内结构各向异性的可变形单斜碲化镓

IF 21.1 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Jieling Tan , Hanyi Zhang , Xiaozhe Wang , Yuecun Wang , Jiang-Jing Wang , Hangming Zhang , En Ma , Wei Zhang
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引用次数: 0

摘要

机械可变形性成为范德华(vdW)半导体的一个新方面,为开发柔性可穿戴电子产品开辟了一条新途径。迄今为止,对可变形半导体的筛选仅限于高对称性晶体结构。在这里,我们将领域扩展到具有面内各向异性的低对称半导体。我们的研究重点是碲化镓,它由高度扭曲的四层板坯和人字形 vdW 间隙组成。通过连续滚动实验,我们证明了碲化镓具有极佳的变形性和高抗断裂性。这种单斜晶体的塑性变形由层间滑移和跨层滑移两种方式介导,其中跨 vdW 间隙的碲原子之间不可忽略的相互作用发挥了重要作用。扭曲的四层板的结构完整性是由短而强的共价键维持的,而保持高面内各向异性的关键因素是坚固的水平同极性 Ga-Ga 键。在严重变形的样品中,非晶化和微裂的形成有助于释放内应力。非晶态 GaTe 的形成有助于防止裂纹凝聚和发展造成的灾难性故障。我们的工作为集成具有各向异性功能的可变形柔性器件铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Deformable monoclinic gallium telluride with high in-plane structural anisotropy

Deformable monoclinic gallium telluride with high in-plane structural anisotropy
Mechanical deformability becomes a new facet of van der Waals (vdW) semiconductors, which opens up a new avenue to develop flexible and wearable electronics. The screening for deformable semiconductors is so far limited to high-symmetric crystalline structures. Here, we extend the realm towards low-symmetric semiconductors with in-plane anisotropy. We focus on gallium telluride, which is comprised of highly distorted quadruple-layer slabs and zigzag-shaped vdW gaps. By carrying out continuous rolling experiments, we prove that gallium telluride exhibits excellent deformability with high fracture resistance. The plastic deformation in this monoclinic crystal is mediated by both inter-layer slips and cross-layer slips, where the non-negligible interactions between Te atoms across vdW gaps play a major role. The structural integrity of the distorted quadruple-layer slabs is sustained by short and strong covalent bonds, and the key ingredient to keep the high in-plane anisotropy is the robust horizontal homopolar Ga–Ga bonds. In severely deformed samples, amorphization and the formation of micro-cracks help release the internal stresses. The formation of amorphous GaTe could help prevent catastrophic failures of crack coalescence and development. Our work paves the way for integration of deformable and flexible devices with anisotropic functionalities.
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来源期刊
Materials Today
Materials Today 工程技术-材料科学:综合
CiteScore
36.30
自引率
1.20%
发文量
237
审稿时长
23 days
期刊介绍: Materials Today is the leading journal in the Materials Today family, focusing on the latest and most impactful work in the materials science community. With a reputation for excellence in news and reviews, the journal has now expanded its coverage to include original research and aims to be at the forefront of the field. We welcome comprehensive articles, short communications, and review articles from established leaders in the rapidly evolving fields of materials science and related disciplines. We strive to provide authors with rigorous peer review, fast publication, and maximum exposure for their work. While we only accept the most significant manuscripts, our speedy evaluation process ensures that there are no unnecessary publication delays.
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