Discussion
The reverse saturation current of a PN junction diode
Answer: B
The reverse saturation current increases with temperature.
The reverse saturation current comes from minority carriers generated thermally near the junction. Their number rises steeply with temperature, so the current roughly doubles for every 10 degrees Celsius rise in silicon and germanium diodes. This is why diodes and transistors are prone to thermal drift.
It therefore does not decrease with temperature and is not independent of it. By definition it is the current under reverse bias, so it does not depend on the forward voltage.
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