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Let our semiconductor be a crystal of a Group 14 element, for clarity. When you replace a Group 14 atom with a Group 15 atom, it releases one extra electron to the conduction band, and remains with only 4 valence electrons (instead of the regular 5), and hence acquires a positive charge. This is how a N-type semiconductor is created. When you replace a ...


2

As far as Ī read it, rob’s answer (see above) is basically correct. But Ī’d point on two things: downplayed implications for electrostatic field, and a misconception that the depletion region forms an insulator (rob worded it as “acts sort of like an insulator” that is careful enough, but declined to comment explicitly on the nature of that substance). Due ...



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