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This is called an n-type semiconductor. Boron can also be used to dope a pure crystal of silicon. But since boron only offers 3 of. the four electrons that a silicon atom needs, each silicon center is left with a hole. Semiconductors made in this manner are called p-type. In a p-type material if an atom from a neighbouring atom fills the hole, it will leave a. hole adjacent to it.
The PN junction. In the previous tutorial we saw how to make an N-type semiconductor material by doping a silicon atom with small amounts of Antimony and also how to make a P-type semiconductor material by doping another silicon atom with Boron.N Junction Distance. As the N-type material has lost electrons and the P-type has lost holes, the N-type material has become positive with respect to the P-type.