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Can we take one slab of p-type semicondu...

Can we take one slab of p-type semiconductor and physically join it to another n-type semiconductor to get p-n junction?

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No. Any slab however flat will have roughnes much larger than the inter-atomic crystal spacing of 2 to 3 Å and hence continuous contact at the atomic level will not be possible.
The junction will behave as a discontinuity for the flowing charge carriers.
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