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

Can we take one slab of p-type semiconductor and physically join it to

1.	Can we take one slab of p-type semiconductor and physically join it to another n-type semiconductor to get p-n junction ?
Answer» SOLUTION :No! Any slab , HOWSOEVER flat , will have roughness much larger than the inter-atomic crystal spacing (-2 to 3 A) and HENCE continuous contact at the atomic LEVEL will not be possible . The JUNCTION will behave as a discontinuity for the following charge carriers .

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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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