I(V)-characteristics
If the calculation is performed for different currents I we get the I(V)-curves, which are shown in the figure : At lower currents the characteristcs are nearly ohmic, but with increasing voltage the
current tends to saturate until the pinch-off effect causes a plateau of the current. A further increase of the voltage
results in a further increase of the current because of a possible break-through between the p-layers and the positive
contact. If the generation is increased the current plateau is shifted to higher values. The reason for this shift is the
current redistribution from the n-layer to the p-layers. The current in the n-layer decreases with illumination and
the pinch-off situation disappears if the total current is kept unchanged. In order to get the pinch-off situation again
this current has to be increased resulting in a higher value of the current plateau.
For more detailed information