File:Bjt equilibrium bands v2.svg

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Summary[edit]

Energy band diagram of a simple NPN bipolar junction transistor under equilibrium showing electron energy versus position. The depletion regions of the emitter-base and base-collector junctions are marked. ${\displaystyle E_{c}}$ is the conduction band, ${\displaystyle E_{f}}$ is the device fermi energy level, ${\displaystyle E_{i}}$ is the intrinsic Fermi level of the undoped semiconductor, and ${\displaystyle E_{v}}$ is the valence band.

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