In a p-n junction diode acting as a half-waverectifier, which of the following statements is not true?The average output voltage over a cycle is non-zeroThe drift current depends on biasingThe depletion zone decreases in forward biasingThe diffusion current increases due to forward biasing
Question
In a p-n junction diode acting as a half-waverectifier, which of the following statements is not true?The average output voltage over a cycle is non-zeroThe drift current depends on biasingThe depletion zone decreases in forward biasingThe diffusion current increases due to forward biasing
Solution
The statement that is not true is: "The depletion zone decreases in forward biasing".
In a p-n junction diode, the depletion zone actually increases in forward biasing. When a diode is forward biased, the p-side is connected to the positive terminal of the battery and the n-side is connected to the negative terminal. This causes the holes in the p-region and the electrons in the n-region to move away from the junction, which widens the depletion zone.
The other statements are true. The average output voltage over a cycle is non-zero in a half-wave rectifier. The drift current does depend on biasing. And the diffusion current increases due to forward biasing because more charge carriers are available for conduction.
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