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Improved two-diode model for more detailed simulation of I-U-curves for solar cells and modules

: Elies, S.; Hermle, M.; Burger, B.


Sinke, W. ; WIP - Renewable Energies, München; European Commission; UNESCO; World Council for Renewable Energy; International Photovoltaic Equipment Association:
24th European Photovoltaic Solar Energy Conference 2009. CD-ROM : The compiled State-of-the-Art of PV Solar Technology and Deployment. Proceedings of the International Conference held in Hamburg, 21-25 September 2009
München, 2009
ISBN: 3-936338-25-6
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>
Conference Paper
Fraunhofer ISE ()

The two-diode model is often used to simulate I-U curves of solar cells and modules. This model can lead to errors by the use of constant fit parameters, especially under low illumination and has been analyzed by several authors, with regard to the dependence of irradiance and temperature on the fit-parameters ID1, ID2, RS, RP, n1, n2. Several analyses which are sometimes based on unequal two-diode models, lead to different or contradictory results. For this reason the two-diode model was reanalyzed, based on existing physical theories. The aim of these analyses was a further development of the two-diode model for the simulation of solar cells and modules, especially the behavior under low illumination. In this work an improved two-diode model is presented which leads to a more accurate simulation at low illuminations and higher temperatures. Additionally an experimentally determined mathematical relation for the dependence of irradiance and temperature on the fit-parameters is given.