How does the energy gap in an instrinsic semiconductor vary, when doped with a pentavalent impurity and a trivalent impurity. Draw their energy band diagrams.
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When a semiconductor is doped with a pentavalent impurity atoms [like As or P], some additional energy levels are created in the energy gap just below the bottom of conduction band. See Fig. When a semiconductor is doped with a trivalent impurity atoms (like B, A1ect.), some additional energy levels are created in the energy gap just above the upper level of valence band. See Fig.
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