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Question
Extremely pure samples of Ge and Si are non-conductors but their conductivity increases suddenly on introducing ......... in their crystal lattice.
Extremely pure samples of Ge and Si are non-conductors but their conductivity increases suddenly on introducing ......... in their crystal lattice.
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Solution
The correct option is C both A and B
Doping is the addition of small amount of foreign impurity in the host crystal. It results in an increase in the electrical conductivity of the crystal. Doping of group 14 elements (such as Si, Ge etc.) with elements of group 15 (such as As) produces an excess of electrons in the crystals, thus, giving n-types semiconductors. Doping of groups 14 elements with group 13 elements (such as Indium) produces holes (electron deficiency) in the crystals. Thus, p-type semiconductors are produced. The symbol 'p' indicates flow of positive charge.
Doping is the addition of small amount of foreign impurity in the host crystal. It results in an increase in the electrical conductivity of the crystal. Doping of group 14 elements (such as Si, Ge etc.) with elements of group 15 (such as As) produces an excess of electrons in the crystals, thus, giving n-types semiconductors. Doping of groups 14 elements with group 13 elements (such as Indium) produces holes (electron deficiency) in the crystals. Thus, p-type semiconductors are produced. The symbol 'p' indicates flow of positive charge.
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