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depletion region

The space charge region (RLZ) is the region that builds up in the pn junction between two differently doped semiconductors

: one positively doped and one negatively doped. This region is called the junction in semiconductors. The junction is characterized by the electrons in the n-doped semiconductor and the holes in the p-doped semiconductor, whose concentration is different. Therefore, an electric field

builds up in the space charge region and an electric potential is created which causes the electrons and holes to drift into the other charge region.

Space charge zone (RLZ) with potential equalization

Space charge zone (RLZ) with potential equalization

The space charge zone can be changed in its width by an applied voltage. Depending on the orientation of the voltage, the space charge zone can be widened or narrowed. If the n-doped region is affected by a negative charge, the electrons migrate into the boundary region and thus reduce the space charge zone. It is different if the n-doped region is influenced with a positive voltage, then the space charge zone increases. If there is a lack of charge carriers in the space charge zone, it is called a depletion zone.

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Englisch: depletion region
Updated at: 15.06.2016
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