Question: a) In your own words, explain how donor impurities in semiconductors give rise to free electrons in numbers in excess of those generated by valence

a) In your own words, explain how donor impurities in semiconductors give rise to free electrons in numbers in excess of those generated by valence band-conduction band excitations.

(b) Also explain how acceptor impurities give rise to holes in numbers in excess of those generated by valence band-conduction band excitations.

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