On the effects of the asymptotic behavior of local ideality factor for a two-diode model in silicon solar cells

Abstract

Deviations from ideality on the behavior of solar cells can be studied by the local ideality factor defined as the inverse of the slope of the I-V characteristic curves. In this work the local ideality factor is used to characterize damaged cells from the point of view of a two-diode model. By means of the two-diode model, only what takes place in the depletion zone is analyzed. The asymptotic study of the local ideality factor outlines three behaviors depending on the values of the parameters in the model. Dismissing any of the parameters would involve an incorrect characterization and a misunderstanding in the relevance of the components from the damaging structure.