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In a forward biased pn junction diode, the sequence of events that best describes the mechanism of current flow is

1. injection, and subsequent diffusion and recombination of minority carriers
2. injection, and subsequent drift and generation of minority carriers
3. extraction, and subsequent diffusion and generation of minority carriers
4. extraction, and subsequent drift and recombination of minority carriers

Correct answer: injection, and subsequent diffusion and recombination of minority carriers

Solution

In a forward biased pn junction diode, the applied voltage causes majority carriers to be injected from the p-side into the n-side, where they diffuse and recombine with minority carriers, resulting in a flow of current.

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