Discussion
Why does a silicon diode's forward drop fall as temperature rises?
Answer: D
Because the saturation current rises steeply with temperature, less forward voltage is needed to carry the same current - about two millivolts less per degree. Bulk resistance, depletion width and mobility all change with temperature too, but the saturation current dominates by a wide margin. That coefficient is used deliberately in temperature sensors and has to be compensated in reference circuits, so its sign and size are both worth remembering.
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