The energy band diagrams for three semiconductor samples of silicon are as shown. We can then assert that

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sample X is undoped, while samples Y and Z have been doped with a third group and a fifth group impurity, respectively.

sample X is undoped, while both samples y and Z have been doped with a fifth group impurity.

sample X has been doped with equal amounts of third and fifth group impurities, while samples Y and Z are undoped.

sample X is undoped, while samples Y and Z have been doped with a fifth group and a third group impurity, respectively.

answer is D.

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Detailed Solution

In sample X, no impurity level is seen, so it is undoped. In sample Y, impurity energy level lies below the conduction band, so it is doped with fifth group impurity. In sample Z, impurity energy level lies above the valence band so it is doped with third group impurity.

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