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A simple method is proposed to determine the series resistance R s and the perfection factor n of solar cells from the measurement of the tangents to the current I–voltage V curve at constant light intensity. The values of R s and n thus determined are then used to predict the maximum power P m and the voltage V m at which the power gets maximum. This new method is applied successfully to the conventional cell, BSF (Back Surface Field) cell and the textured BSF Si cell. A good agreement is obtained between the calculated- and the directly measured values of V m and P m.

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