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Crystallinity and electron transport

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Hyo X
#1
Nov16-13, 01:17 AM
P: 37
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?
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M Quack
#2
Nov22-13, 10:09 AM
P: 660
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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