Question
Can we physically combine a strip of P-type semiconductor with an N-type semiconductor to form a P-N junction?
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Answer
No! Any strip, no matter how flat, will be much rougher than the interatomic crystal gap ( $\sim 2$ to $3 \ Å$ ) and hence regular contact (or continuous contact) at the atomic level will not be possible. The junction will behave like a discontinuity for flowing charge carriers.
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