A silicon specimen is made into a p-type semiconductor by doping on the average one indium atom per 5×107 silicon atoms. If the number density of atoms in the silicon specimen is 5×1028 atoms/m3. Then the number of acceptor atoms in silicon will be.
1.0×1015atom/cm3
2.5×1030atom/cm3
1.0×1013atom/cm3
2.5×1034atom/cm3
A
2.5×1030atom/cm3
B
1.0×1015atom/cm3
C
1.0×1013atom/cm3
D
2.5×1034atom/cm3
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Solution
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Number density of atoms in Si =5×1028atomsm3=5×1022atomscm3 Since 1 atom of indium is doped in 5×107 silicon atoms, ∴ Total number of doped indium atoms =5×10225×107=1×1015atomscm3 ∴ Number of acceptor atoms in silicon =1×1015atomscm3.
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