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Which outcome impairs photodetection when surface states trap electrons?

A)Recombination diminishes charge separation
B)Band bending enhances collection
C)Quantum efficiency approaches unity
D)Diffusion maintains carrier gradients

💡 Explanation

Surface states act as recombination centers capturing excited electrons; Shockley-Read-Hall recombination, where electrons recombine with holes, dominates because trapped electrons enhance the probability of recombination thus preventing generation of a photocurrent, rather than promoting charge separation.

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