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Nanoindentation-induced phase transformations in silicon at elevated temperatures.

S Ruffell1, J E Bradby, J S Williams

  • 1Department of Electronic Materials Engineering, Research School of Physics and Engineering, Australian National University, Canberra, 0200, Australia. simon.ruffell@anu.edu.au

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|May 8, 2009
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Elevated temperatures enhance silicon phase transformation during nanoindentation unloading. The nucleation of Si-III/Si-XII phases depends on temperature and silicon matrix type.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Nanoindentation is a key technique for probing mechanical properties of materials at the nanoscale.
  • Silicon exhibits complex phase transformations under mechanical stress.
  • Understanding these transformations is crucial for semiconductor device fabrication and reliability.

Purpose of the Study:

  • To investigate the effect of elevated temperatures on nanoindentation-induced phase transformations in silicon.
  • To analyze the nucleation and evolution of high-pressure silicon phases (Si-III/Si-XII) during unloading.
  • To determine the influence of the silicon matrix (amorphous vs. crystalline) on phase transformation behavior.

Main Methods:

  • Performing nanoindentation experiments on silicon samples at temperatures ranging from 25 to 150 degrees C.
  • Utilizing in-situ monitoring techniques to capture pop-out events and unloading behavior.
  • Analyzing the transformed zones using advanced microscopy and spectroscopy (implied).

Main Results:

  • Nanoindentation-induced nucleation of Si-III/Si-XII phases on unloading is enhanced with increasing temperature.
  • At higher temperatures, transformation in an amorphous silicon matrix occurs continuously without pop-out.
  • Slow unloading at elevated temperatures suppressed Si-III/Si-XII formation in a crystalline silicon matrix.
  • The final phase composition depends on both temperature-enhanced nucleation and the thermal stability of the transformed phases.

Conclusions:

  • Elevated temperatures significantly influence the mechanism and extent of nanoindentation-induced phase transformations in silicon.
  • The type of silicon matrix (amorphous or crystalline) plays a critical role in the observed phase transformation behavior.
  • Temperature-dependent nucleation and phase stability are key factors governing the final transformed structure.