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Question
Assertion :The conductance through electrons is called n-type conduction and if through positive holes, it is called p-type conduction. Reason: Doping involves preparation of semi-conductors by the presence of impurities in the intrinsic semi-conductor.
Assertion :The conductance through electrons is called n-type conduction and if through positive holes, it is called p-type conduction. Reason: Doping involves preparation of semi-conductors by the presence of impurities in the intrinsic semi-conductor.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The addition of small amount of foreign impurity in the host crystal is called as doping. 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 and thus gives n-type 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 the flow of positive charge.
Solids have been classified as metals, insulators (bad conductors) and semiconductors. The electrical conductivity of solids is due to the motion of electrons and holes or ions. Conduction of ionic solids is due to the absence of vacancies and other defects. Thus conductivity of semiconductors, as well as insulators, is mainly because of impurities and defects present in them. Electrons and holes produced by the ionization of defects contribute to conduction in these solids.
The addition of small amount of foreign impurity in the host crystal is called as doping. 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 and thus gives n-type 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 the flow of positive charge.
Solids have been classified as metals, insulators (bad conductors) and semiconductors. The electrical conductivity of solids is due to the motion of electrons and holes or ions. Conduction of ionic solids is due to the absence of vacancies and other defects. Thus conductivity of semiconductors, as well as insulators, is mainly because of impurities and defects present in them. Electrons and holes produced by the ionization of defects contribute to conduction in these solids.
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