- Germanium is a Group 14 semiconductor with 4 valence electrons. - n-type semiconductors are created by doping with donor impurities. - Donor impurities have more valence electrons than the semiconductor material. - For Germanium (4 valence electrons), Group 15 elements (pentavalent, 5 valence electrons) are used as donors.
The valence electron of the impurity atom that is to be added to germanium crystal so as to make it a n-type semiconductor is
Asked in TNPSC CS Prelims 2017 · Topic: Conductivity (Intrinsic and Extrinsic Semiconductors: Doping, carrier concentration, and Fermi level)
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