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Germenium and silicon are the examples of Semiconductors.
N-type semiconductor materials which have free electrons,(which are negatively charged).P-type semiconductor materials which have too few electrons. Therefore the opposite of electrons - holes (which are negatively charged).You can think of it like positive and negative poles of a magnet.
Those semiconductors in which some impurity atoms are embedded are known as extrinsic semiconductors.
power semiconductorspower semiconductors can drive large currents during forward biassemiconductorsemiconductors drive small currents during forward bias
many of them.