A) p-type semiconductor
B) insulator
C) metal
D) n-type semiconductor
Correct Answer: A
Solution :
The given figure represents p-type semiconductor as described below: When one of the silicon atom (valence = 4) has been replaced by an atom of aluminium (valence=3), the aluminium atom can bond covalently with only three silicon atoms, so there is now a ?missing? electron (a hole) in one aluminium-silicon bond with a small expanditure of energy, an electron can be torn from a neighbouring silicon-silicon bond to fill this hole, thereby creating a hole in that bond. Similarly, an electron from some other bond can be moved to fill the second hole. In this way, the hole can migrate through the lattice.You need to login to perform this action.
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