I was just doing a project for a website and my team member excavated a standard pn-junction diode to see that inside the ceramic casing, the semiconductors of p and n doping merely abut together in close alignment. Shouldn't the case be that a single length is variably doped with n and p type impurities to form the junction? If I remember correctly, then textbooks tell that simply joining the two by their boundary does not make it a p-n junction since there are always irregularities on microscopic scale. Any insights on this?
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