A group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity. To which group should this impurity belong? 

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2 Answers

An n-type semiconductor conducts because of the presence of extra electrons. Therefore, a group 14 element can be converted to n-type semiconductor by doping it with a group 15 element. 

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To prepare n-type semiconductor, group 14 element (such as silicon or germanium having four valence electrons) is doped with group 15 element (such as arsenic or phosphorus having five valence electrons).

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