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Illustration Current-Voltage Graph for Photoelectric Effect

Current-Voltage Graph for Photoelectric Effect
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A photocurrent-voltage graph (I-V graph) resulting in the photoelectric effect when an accelerating voltage \(U_{\text B}\) is used between the capacitor plates. The photocurrent \(I_{\text p}\) is the electron current generated by the illumination of one of the capacitor plates.

As can be seen in the graph, the photocurrent goes into saturation with increasing accelerating voltage and reaches a maximum value \(I_{\text{max}}\). In this state, all electrons are "sucked in" by the opposite capacitor plate.