Current Flow. ECE 2204. n+-n and p+-p Junctions. In the previous set of slides on diffusion currents, we showed that a diffusion current flowed when an n+ layer was in contact with an n layer But, current can’t flow continuously without some source of energy
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The slope in the conduction band energy and the valence band energy indicate that an electric field has been induced at the n+-n junction as the electrons
Drift currents flows because of the electric field that balance the diffusion currents
J is the current density or current I divided by the cross-sectional area A through which the carriers move.
You should be able to determine the direction of carrier flow and determine whether the currents are diffusion or drift.