Abstract
In previous work, semiempirical expressions have been established for the efficiency and fill factor of solar cells as a function of series and shunt resistances confined to the first-order Taylor series approximation. In the present paper, a fit to the exact values of the efficiency is obtained including the second-order terms, which also allows the efficiency to be found in cases where the series resistance R s and shunt conductance G sh are relatively large. The accuracy is discussed and the results are demonstrated by taking an example of a typical solar cell under two different illuminations. We report also a faster-converging numerical technique for the computation of current and voltage at the maximum power point using Newton's iterative method.
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