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  4. In n-type semiconductor when all donor states are filled, then the net charge density in the donor states becomes

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Q. In $n$-type semiconductor when all donor states are filled, then the net charge density in the donor states becomes

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

If all the donor states in n-type semiconductor are filled, the number of electrons in donor states will increase. Due to it, the charge density in donor states will become more than one.