Danstar2
Member
- Joined
- Sep 19, 2012
- Messages
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- HSC
- 2012
It's fairly straight forward,Whoever answers this correctly deserves an award.
Identify differences in p-type and n-type semiconductors in terms of the relative number of negative charge carriers and positive holes.(4-marks)
p-type and n-type semiconductors have an introduced 'impurity' atom which changes their conductivity.
p-type have an introduced impurity atom with one less electron (e.g. 3 valence electrons instead of 4) than that of the silicon atoms. This leaves a positive hole in the lattice, thus making the material a p-type semiconductor.
n-type also have an introduced impurity atom but with one more electron (e.g. 5 valence electrons instead of 4) than that of the silicon atoms. This increases the overall amount of charge carriers in the material, thus making it an n-type semiconductor.
Also I believe to make a p or n type conductor it's something like only 1 impurity atom per 1million silicon that is actually required, but I'm not sure..