MHT CET202527 Apr 2025Evening ShiftPhysicsSemiconductorsActual
In n -type semiconductor, which of the following statement is true?
Options
- AElectrons are majority carriers and trivalent atoms are dopants.
- BElectrons are minority carriers and pentavalent atoms are dopants.
- CHoles are minority carriers and pentavalent atoms are dopants.
- DHoles are majority carriers and trivalent atoms are dopants.
Correct answer
A. Electrons are majority carriers and trivalent atoms are dopants.
Step-by-step solution
An n-type semiconductor is formed by doping a pure semiconductor with pentavalent impurities. These atoms have five valence electrons, with four forming covalent bonds and the fifth becoming a free electron that contributes to conduction. This doping process significantly increases the concentration of free electrons, making them the majority charge carriers. Holes are created through thermal excitation but remain minority carriers due to their much lower concentration. Evaluating the statements: Electrons are majo