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Answer: Charge diffusion is what creates the depletion area. Due to the concentration gradient, holes diffuse across the junction from a p-side to an n-side, whereas electrons diffuse in the opposite direction from an n-side to a p-side. Near the junction, the holes and the electrons diffusely move in almost the same direction. Positive and negative ions were created as a result. A pair of positive and negative ions make the dipole at the junction. The depletion region is the area containing the dipoles and is devoid of mobile charge carriers.
What Causes the Depletion Region?
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