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Vacancy formation and strain in low-temperature Cu/Cu(100) growth
Yunsic Shim1, Valery Borovikov, Blas P Uberuaga
1Department of Physics & Astronomy University of Toledo, Toledo, Ohio 43606, USA.
Compressive strain in low-temperature metal thin films results from nanoscale surface roughness. This roughness is caused by suppressed thermal events and shadowing during off-normal deposition, not vacancies.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Thin Film Deposition
Background:
- Compressive strain in metal thin films grown at low temperatures has been observed.
- Previous explanations attributed this strain to high vacancy incorporation during film growth.
Purpose of the Study:
- To investigate the underlying mechanisms responsible for compressive strain in low-temperature metal thin films.
- To challenge the prevailing vacancy incorporation hypothesis.
Main Methods:
- Molecular dynamics simulations
- Parallel temperature-accelerated dynamics simulations
- Analysis of nanoscale surface roughness and shadowing effects
Main Results:
- The study suggests strain originates from increased nanoscale surface roughness.
- Suppression of thermally activated events at low temperatures contributes to roughness.
- Shadowing effects during off-normal deposition exacerbate surface roughness.
Conclusions:
- The observed compressive strain is primarily due to surface morphology changes, not vacancy incorporation.
- Low-temperature growth conditions and deposition angles significantly influence film strain via surface roughness.
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