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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.
   A pure semiconductor material is a very poor conductor or even an  insulator, but when impurities called dopants are added it can  become a quite good conductor.There are two classes of dopants:  N type and P type.f we dope one side of a semiconductor block such that it is n-type, and the other side p-type, a so-called semiconductor junction is formed. This is the building block for all modern electronics such as the diode, transistor and integrated circuit (IC). + 7 others found this useful.