Question

What is meant by n - p type semiconductor?

Answer 1

when group 14 elements dropped with group 15 elements like arsenic they form normal 4 covalent bond with the neighbouring 14 group elements and5th extra electron is free and gets delocalised. this delocalised electrons increase the conductivity of 14 group element .such increase in conductivity is due to negatively charged electrons the 14 group crystal dopped with electron rich impurities are called n type semiconductor