When added an impurity into the silicon which one of the following produces 
‐type of semiconductors? [2000]
Text Solution
Verified by ExpertsThe correct answer is:
C
Silicon has 
valence electrons, when phosphorous with 
valence electrons in its outennost orbit is added, then four of the five valence electrons of the impurity atom form covalent bonds with each valence electron of four silicon atoms and fifth valence electrons becomes free to move in the crystal. As the electrons are charge carriers they are called n − − type.
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