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Question
Assertion :An n−type semiconductor has a large number of electrons but still it is electrically neutral. Reason: An n−type semicondutor is obtained by doping an intrinsic semiconductor with a pentavalent impurity.
Assertion :An n−type semiconductor has a large number of electrons but still it is electrically neutral. Reason: An n−type semicondutor is obtained by doping an intrinsic semiconductor with a pentavalent impurity.
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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
An n−type semiconductor is formed by doping pure germanium or silicon crystal with suitable impurity atoms of valency five. As the impurity atoms take the position of Ge atom in germanium crystal, its four electrons form covalent bonds by sharing electrons with the neighbouring four atoms of germanium whereas the fifth electron is left free. Since the atom on the whole is electrically neutral, the n−type semiconductor is also neutral.
An n−type semiconductor is formed by doping pure germanium or silicon crystal with suitable impurity atoms of valency five. As the impurity atoms take the position of Ge atom in germanium crystal, its four electrons form covalent bonds by sharing electrons with the neighbouring four atoms of germanium whereas the fifth electron is left free. Since the atom on the whole is electrically neutral, the n−type semiconductor is also neutral.
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