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Which mechanism causes decreased conductivity across a semiconductor p-n junction when reverse biased?

A)Increased depletion region width
B)Enhanced electron-hole recombination rates
C)Reduced minority carrier diffusion
D)Increased energy gap tunneling

💡 Explanation

Applying reverse bias increases the width of the depletion region via carrier depletion, with reverse saturation current decreasing conductivity; because fewer carriers are available, therefore a wider gap forms rather than allowing carrier flow.

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