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Physics/electronics

paulmdrdo

Active member
May 13, 2013
386
I'm having a problem understanding what I've read from an electronics book.

can you explain why the trivalent impurities
exert lower forces on the outer-shell electrons than the pentavalent impurities?
and why The valence and conduction bands in an n-type material are at slightly lower energy levels
than the valence and conduction bands in a p-type material?

a lot of thanks!