Lists of Nobel Prizes and Laureates

Semiconductors can change their electrical properties, degree of conduction, by the addition of impurities. This is the reason why silicon needs to be in such a pure form (99.9999% pure). The procedure in which you add impurities to a semiconductor is called doping. The impurities that are used are called dopants. There are two different types of dopants. They are called n-type and p-type dopants.
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MLA style: "The Transistor". Nobel Media AB 2014. Web. 25 Nov 2015. <>