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  4. In an intrinsic semiconductor:

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Q. In an intrinsic semiconductor:

ManipalManipal 2004Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

Pure semiconductors are intrinsic semiconductors. They have not any impurity. Hence, number of electrons in the conduction band is equal to the number of holes in valence band. It means $ {{n}_{e}}={{n}_{h}} $ .