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In each radio control helicopter system you can find amusing projects. In the zone, the total charge is neutral, for each electron that is released into N is a fixed phosphorus atom is a positive ion. And for every mobile hole forms a negative ion, i.e., no net charge distributions, and internal electric fields. At the same time to create two zones of different P and N concentration of carriers (electrons and holes) comes into play the mechanism of diffusion that tends to carry particles from one side to another due to the attraction of opposite charges. The effect is that electrons and holes near the junction of the two crossing areas, and installed in the opposite direction, namely that the N electrons pass into the hollow area P and P zone pass zone N. This movement of charge carriers has a double effect. Focus on the P zone region near the junction. The radio control helicopter circuit electron begins passing the junction and it recombines with a hole. The display a negative charge, since before the arrival of the electron, the total load was zero. Passing the hollow of the P to the N, causes a defect in positive charge on the P, which also shows a negative charge. The same reasoning, but with opposite signs for the area can be N. Consequently, on both sides of the junction is created a loading zone, which is positive in the N and P in the negative. Formation of the junction The load distribution formed in the junction region generates an electric field that opposes the movement of all carriers preventing their total distribution. That is close to the terminals as the materials are original material N and P (before bonding). In union there is a balance between the force of diffusion due to Brownian motion and the attraction of opposite charges. Ultimately the strength of the diffusion and radio control helicopter electric field are balanced and stops the movement of carriers. At that time already formed PN junction diode, as a result of the process we obtain an area P, semiconductor, with a resistance RP, an area N, semiconductor, with a resistance RN and an area called exhaustion or depletion in the junction, which is not conductive, because it's not free charge carriers (all carriers are fitted in place of glass. We can ensure that the radio control helicopter operates an electric field, or that between the extremes of the area union acts a potential barrier.
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