InterviewSolution
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InterviewSolution
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The energy band diagrams for three semiconductor samples of silicon are as shown. We can then assert that A. Sample X is undoped while samples Y and Z have been doped with a third group and a fifth group impurity respectivelyB. Sample X is undoped while both samples Y and Z have been doped with a fifth group impurityC. Sample X has been doped with equal amounts of third and fifth group impurities while samples Y and Z are undopedD. Sample X is undoped while samples Y and Z have been doped with a fifth group and a third group impurity respectively |
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Answer» Correct Answer - D Sample X is an intrinsic semiconductor. Impurity level is not shown. Hence it is not doped. Sample Y is an n-type semiconductor, because the impurity energy level Iies just below the conduction band. It is doped with fifth group impurity (donor). Sample Z is a p-type semiconductor because the impurity energy level lies just above the valence band and it is doped with a third group impurity (acceptor). |
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