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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.
When a doped semiconductor contains mostly free holes it is called p-type, and when it contains mostly free electrons it is known as n-type. The semiconductor materials used in electronic devices are doped under precise conditions to control the concentration and regions of p-and n-type dopants.A single semiconductor crystal can have many p-and n-type regions; the pân junctions between these regions are responsible for the useful electronic behaviour.he semiconductor materials used in electronic devices are doped under precise conditions to control the concentration and regions of p-and n-type dopants. A single semiconductor crystal can have many p-and n-type regions; the pân junctions between these regions are responsible for the useful electronic behaviour.