Crystallinity and electron transport

  1. Nov 16, 2013 #1
    Say we have an electron traveleing in a crystalline conductor. It can scatter off of defects such as vacancies, interstitial atoms, grain boundaries, etc.

    Is there a way to quantify the relationship between conductance and defect density?

    I.e., if I want to build a 2D crystalline conductor, how will 0.5% volume of defects affect transport vs 5% of volume defects?
     
  2. jcsd
  3. Nov 22, 2013 #2
    Yes, electrons get scattered on defects. At high temperatures scattering from thermally excited phonons is dominant. At low temperatures, close to absolute zero, however, defects are usually dominant.

    A way to measure this is to look at the residual resistance ratio

    http://en.wikipedia.org/wiki/Residual-resistance_ratio

    I do not know if there is any way to obtain absolute numbers for defect density. For that x-ray diffraction topography is better.

    http://en.wikipedia.org/wiki/Diffraction_topography
     
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