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  Rectification
The theory of rectification is based on the special properties of the junction that is created between a semiconductor area of n-type and one of p-type. The junction is often referred to as a P-N junction. On one side (N) of this junction there is an excess of electrons because of the addition of n-type dopants to the semiconductor. On the other side (P) where the p-type dopants have been added, there is an excess of holes. This construction, with one n-type and one p-type area in one unit, is generally called a diode. The diode acts as an electrical rectifier, i.e. it only allows current to pass in one direction.
 
     
   
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MLA style: "The Transistor". Nobelprize.org. Nobel Media AB 2014. Web. 28 Jul 2015. <http://www.nobelprize.org/educational/physics/transistor/function/rectification.html>

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