Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 64: Poster: Photovoltaics and Optics
HL 64.22: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1C
Influence of white light and voltage bias on EQE measurements for squaraine based solar cells with varying active layer parameters — •Oliver Kolloge1, Matthias Schulz2, Arne Lützen2, and Manuela Schiek1 — 1Energy and Semiconductor Research Laboratory, Institute of Physics, University of Oldenburg, D-26111 Oldenburg, Germany — 2Kekulé Institute for Organic Chemistry and Biochemistry, University of Bonn, Gerhard-Domagk-Str.1, D-53121 Bonn, Germany
Anilino-Squaraines are stable dyes and are readily available via environmentally friendly condensation reactions. Organic solar cells whose active layer consists of a model squaraine donor blended with a fullerene acceptor are particularly interesting because they show absorption within the deep-red combined with a high Voc. However, these devices suffer from a low fill factor around 40%.
The purpose of this study is a deeper understanding of the performance of these organic solar cells via advanced EQE measurements. J-V-measurements show a linear dependence of Jsc and illumination intensity independent of the active layer thickness. However, white light biased EQE measurements suggest a sublinear intensity response which becomes more obvious for increasing active layer thickness. Furthermore, voltage-dependent EQE measurements hints to a saturation of photocurrent at higher reverse bias voltages.