If the $p-n$ junction diode is unbiased,
- A$n$-type side has lower potential than $p$-type side.
- B$n$-type side has same potential as $p$-type side.
- CAn electric field is established at the junction such that $n$-side is at positive voltage relative to $p$-side.
- DThe potential across the junction is such that $p$-side is at positive voltage relative to $n$-side.
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