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A thin P-type silicon sample is uniformly illuminated with light which generates excess carriers. The recombination rate is directly proportional to

1. the minority carrier mobility
2. the minority carrier recombination lifetime
3. the majority carrier concentration
4. the excess minority carrier concentration

Correct answer: the excess minority carrier concentration

Solution

The recombination rate in a semiconductor is directly influenced by the number of excess minority carriers present; as their concentration increases, the likelihood of recombination events also rises, leading to a higher recombination rate.

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