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  Doping
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". Nobelprize.org. Nobel Media AB 2014. Web. 29 Aug 2015. <http://www.nobelprize.org/educational/physics/transistor/function/doping.html>

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