Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 53: Perovskite and Hybrid Photovolatics I (joint session HL/CPP)
CPP 53.1: Vortrag
Donnerstag, 4. April 2019, 09:30–09:45, H36
Effects of Masking on Open-Circuit Voltage and Fill Factor in Solar Cells — •Kristofer Tvingstedt1, David Kiermasch1, Lidón Gil-Escrig2, and Henk J. Bolink2 — 1Experimentelle Physik VI Julius Maximilians Universität Wûrzburg — 2Instituto de Ciencia Molecular, Universidad de Valencia, C/Catedrático J. Beltrán 2, 46980 Paterna, Spain
Guidelines for the correct measurement protocol of novel photovoltaic technologies such as perovskites are now becoming more frequent in literature. This because, as will be confirmed in this talk, it is not straightforward to correctly measure the true efficiency parameters of these and many other novel solar cells. This is particularly the case for small area research devices which are prone to overestimate the short circuit current density, due to edge effects of various types. To reduce the inaccuracy of current density determination, the common recommended practice is to utilize masks with well-defined apertures, often smaller than the device active area. Herein we show both experimentally and theoretically that this common practice, however, leads to erroneous determination of both open-circuit voltage and fill factor, which are figures of merit of equal importance to the short-circuit current density. Although the errors induced in voltage and fill factor by using a mask are generally smaller than what the errors in current can amount to when not using a mask, they are on the other hand omnipresent and can be quite well described.