I keep getting “Depletion region” questions wrong in Semiconductor Electronics (Diodes). What's the trap?
thinking the depletion region has free charge carriers.
The usual trap: thinking the depletion region has free charge carriers. How to avoid it: it's 'depleted' of carriers — that's what creates the barrier. Go back to the definition — the charge-free zone at a p–n junction that sets up a built-in barrier potential.
Key point
Depletion region
Common mistake
thinking the depletion region has free charge carriers.
Memory tip
it's 'depleted' of carriers — that's what creates the barrier.
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