Anisotropic mechanical responses and plastic deformation mechanisms of cadmium telluride under indentations

Xu, Chao1; Zhang, Weilu1; Hu, Mingdong1; Zhang, Jing1; Lang, Zhe1; Li, Pengwei1; Liu, Huaping2; Wang, Pei3; Liu, Chunmei1

2022-08-01

10.1007/s00339-022-05873-7

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   Impact Factor & Quartile

0947-8396

1432-0630

Molecular dynamic simulations were performed to investigate the indentations of CdTe crystal on (100), (110) and (111) surfaces. We found that the incipient plasticity, hardness, elastic recovery ratio and the structural evolution of CdTe during the indenting process depend strongly on the orientation of the indented surfaces due to the anisotropic nature of CdTe. The obtained load-displacement curves showed abrupt drops at critical indentation depths, indicating the occurrence of incipient plasticity. We found that the (001) plane yields first during the indenting process, followed by (110) plane, and the (111) plane yields last. For all the indented planes of CdTe, the incipient plasticity should be resulted from the nucleation and propagation of 1/2 < 110 > dislocations, which is consistent with the results from both experiments and the calculations of the generalized stacking fault energy. We found that the dislocation distribution under the indented (110) plane shows a twofold rotation symmetry, while those under the indented (111) and (001) planes show three- and fourfold rotation symmetry, respectively. The temperature effect on the indentation responses and structural evolution were also studied. This paper will not only answer the question about the orientation-dependent indentation responses of CdTe crystals, but also reveal the dislocation activities under the indentations in real time. The results of this paper are generally applicable to CdTe single-crystal systems and may provide reference data to improve the design and ultimately performance of the related CdTe-based devices.

Indentation Plastic deformation Temperature effects CdTe Molecular dynamics

SCI ; EI

English

Others

National Natural Science Foundation of China["51502217","11504280","52002166"]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied

WOS:000834834400005

SPRINGER HEIDELBERG

20223212532706

Anisotropy ; Cadmium telluride ; Crystal orientation ; II-VI semiconductors ; Indentation ; Plastic deformation ; Rotation ; Single crystals ; Temperature

Thermodynamics:641.1 ; Semiconducting Materials:712.1 ; Physical Chemistry:801.4 ; Chemical Products Generally:804 ; Mechanics:931.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Crystalline Solids:933.1 ; Crystal Lattice:933.1.1

PHYSICS

Web of Science

1.Wuhan Univ Sci & Technol, Dept Appl Phys, Wuhan 430081, Peoples R China
2.Huazhong Univ Sci & Technol, Sch Aerosp Engn, Wuhan 430074, Peoples R China
3.Southern Univ Sci & Technol, Acad Adv Interdisciplinary Studies, Dept Phys, Shenzhen 518055, Peoples R China

Xu, Chao,Zhang, Weilu,Hu, Mingdong,et al. Anisotropic mechanical responses and plastic deformation mechanisms of cadmium telluride under indentations[J]. APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING,2022,128(8).

Xu, Chao.,Zhang, Weilu.,Hu, Mingdong.,Zhang, Jing.,Lang, Zhe.,...&Liu, Chunmei.(2022).Anisotropic mechanical responses and plastic deformation mechanisms of cadmium telluride under indentations.APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING,128(8).

Xu, Chao,et al."Anisotropic mechanical responses and plastic deformation mechanisms of cadmium telluride under indentations".APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 128.8(2022).