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Figure 3.11. The effect of series resistance on fill factor.
The shunt resistance (R sh ) is due to p-n junction non-idealities and impurities near the
junction, which cause partial shorting of the junction, particularly near cell edges. The
effect of shunt resistance is shown in Fig. 3.12.
Figure 3.12. The effect of shunt resistance on fill factor in a solar cell.
Since the fill factor determines the power output of the cell, the maximum power
output is related to the series resistance, as given approximately by
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