Crystallinity and electron transport

  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. 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
     
Know someone interested in this topic? Share a link to this question via email, Google+, Twitter, or Facebook

Have something to add?

0
Draft saved Draft deleted