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Fermi Level of semiconductor

by LayMuon
Tags: fermi, semiconductor
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LayMuon
#1
Aug15-14, 04:20 PM
P: 148
Hi Guys, I read that the Fermi level of semiconductor, like germanium, is in-between the completely occupied upper band and conduction band, i.e. right in the gap. Why is that? shouldn't it have beed exactly the highest occupied level ?
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Simon Bridge
#2
Aug16-14, 12:28 AM
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Only for low temperatures, and only if there are no impurities.
The band theory of solids is a bunch of rules so you don't have to deal with the fine details of the potential and the impact of the impurities.

http://hyperphysics.phy-astr.gsu.edu...ids/fermi.html


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