Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Organic Electronics and Photovoltaics III - Organic Photovoltaics
CPP 50.13: Vortrag
Donnerstag, 4. April 2019, 12:45–13:00, H18
Modelling of photoactive area spreading in unstructured photovoltaic cells — •Mathias Gruber1,2, Vladislav Jovanov1, and Veit Wagner1 — 1Department of Physics and Earth Sciences, Jacobs University Bremen, 28759 Bremen, Germany — 2PolyIC GmbH & Co. KG, 90763 Fürth, Germany
Photovoltaic cells incorporating unstructured conductive layers produce a significant amount of additional photocurrent outside the electrode overlap area by photoactive area spreading. This leads to a large error in the extraction of solar cell current density, fill factor and cell efficiency from I-V-measurements. To counteract this effect we present an analytical model which is able to describe the photoactive area spreading effect quantitatively, yielding more accurate results than the conventional shadow masking approach. The presented model only requires layer sheet resistance data and the contact geometry to allow to calculate and remove the spreading current contribution from I-V-measurements of unmasked solar cells. This allows to extract accurate solar cell efficiency and j-V-data, which is demonstrated on the example of unstructured metal mesh based organic solar cells. The presented data demonstrates the problem of the conventional shadow masking approach and shows that our model yields more accurate results down to very low illumination light intensities.