What happens if a P-type wafer touches an N-type?

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SUMMARY

When an n-type silicon wafer contacts a p-type wafer, a depletion zone forms, resulting in the creation of a diode. The extra electrons from the n-type wafer do not discharge instantly to the p-type; instead, they create a potential barrier that establishes the diode's functionality. Physical contact between the two doped silicon pieces is necessary for this interaction, and no intermediary substance is required to induce the reaction.

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radaballer
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I am attempting to build a transistor. If a n-type silicon wafer makes physical contact with a p-type wafer, will the extra electrons found in the N-type discharge to the p-type instantly? Is physical contact the requisite for interaction between two doped silicon peices? Or is there an intermediary substance required to induce a reaction?
 
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A depletion zone forms and you get a diode.
 

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