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

[radaballer]

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?

 

[Khashishi]

A depletion zone forms and you get a diode.