Discussion
If the temperature of a semi-conductor diode increases, then leakage current .........................
Answer: C
The leakage current increases.
The reverse leakage (saturation) current of a diode is carried by minority carriers, which are generated thermally. Their number rises steeply with temperature: as a rule of thumb the reverse saturation current roughly doubles for every 10 °C rise in a silicon or germanium diode.
So it cannot remain the same or decrease, and it never becomes zero, because thermal generation of electron-hole pairs never stops at any practical temperature. This temperature sensitivity is one reason transistor bias circuits need stabilisation against thermal runaway.
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