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Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
Published on: July 17, 2020
Study on nanometric cutting of germanium by molecular dynamics simulation
Min Lai1, Xiaodong Zhang, Fengzhou Fang
1State Key Laboratory of Precision Measuring Technology & Instruments, Centre of MicroNano Manufacturing Technology, Tianjin University, Tianjin, 300072, China. fzfang@gmail.com.
Nanoscale Research Letters
|January 8, 2013
Summary
Three-dimensional molecular dynamics simulations reveal material flow phenomena during nanometric cutting of germanium. Uncut thickness correlates with undeformed chip thickness, and cutting resistance varies by crystal plane due to germanium
Area of Science:
- Materials Science
- Nanotechnology
- Computational Physics
Background:
- Nanometric cutting is crucial for fabricating micro/nano-scale devices.
- Understanding material behavior during ultra-precision machining is essential for process optimization.
Purpose of the Study:
- To investigate the material flow and deformation mechanisms during the nanometric cutting of germanium.
- To analyze the influence of crystal plane orientation on cutting forces and surface integrity.
Main Methods:
- Three-dimensional molecular dynamics (MD) simulations were employed.
- Simulations focused on the nanometric cutting process of germanium.
Main Results:
- Observed material flow phenomena include extrusion, ploughing, and stagnation.
- Uncut thickness showed proportionality to undeformed chip thickness, largely independent of the machined crystal plane.
- Cutting resistance was higher on the (111) face compared to the (010) face, attributed to germanium's anisotropy.
- Phase transformation (diamond cubic to β-Sn) and direct amorphization occurred during cutting.
- The machined surface exhibited an amorphous structure.
Conclusions:
- Nanometric cutting of germanium involves complex material flow and structural transformations.
- Anisotropy significantly influences cutting forces, with higher resistance observed on specific crystal planes.
- The resulting machined surface is predominantly amorphous, impacting its properties.
