(a)Doping: The process of mixing impurities of other elements in pure semiconductors is known as doping.
(b)Extrinsic semiconductors: the semiconductors, in which trivalent and pentavalent elements are mixed as impurities, are known as extrinsic semiconductors.
(c) The extrinsic semiconductors are of two types
(i) N-type semiconductors
(ii) P-type semiconductors.
d) Difference between N-type and P-type semiconductors
(vii) Characterizes Si and Ge at 300 K
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