Why pentavalent impurities are added to get n type why not hexavalent?

1.	Why pentavalent impurities are added to get n type why not hexavalent?
Answer» HIII..... GOOD MORNING;-) HERE IS YOUR ANSWER:------ WE NEED AN EXCESS OF ONE ELECTRON FOR INCREASING THE CONDUCTIVITY,HENCE WE NEED PENTAVALENT IMPURITIES. HOPE THIS HELPS YOU.....

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