Nobelprize.org
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Lists of Nobel Prizes and Laureates
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  N-type Dopants
Some of the most common n-type dopants are located in group 15 of the periodic table. One example of such an dopant is the element phosphorus (P). The n-type dopant adds negatively charged electrons to the semiconductor, thus the name. Sometimes these dopants are called donators because they donate electrons to the semiconductor.		  
     
 
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MLA style: "The Transistor". Nobelprize.org. Nobel Media AB 2013. Web. 19 Jun 2013. <http://www.nobelprize.org/educational/physics/transistor/function/n-type.html>

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