CUET Preparation Today
When a semiconductor is doped with a donor impurity |
electron concentration decreases and hole concentration remains the same hole concentration decreases and electron concentration remains the same electron concentration increases and hole concentration remains the same electron concentration increases and hole concentration decreases |
electron concentration increases and hole concentration decreases |
The correct answer is Option (4) → electron concentration increases and hole concentration decreases Donor impurities (like pentavalent atoms) provide extra free electrons, making the semiconductor n-type. This increases the number of electrons (majority carriers). Due to recombination, the number of holes (minority carriers) decreases, so hole concentration falls.
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