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HL: Fachverband Halbleiterphysik
HL 13: Poster Session I
HL 13.51: Poster
Monday, March 12, 2018, 17:30–19:30, Poster B
Cause Study of the Low Fill Factor of Squaraine Based Solar Cells by Steady-State Methods — •Oliver Kolloge1, Dorothea Scheunemann1, 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
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 open circuit voltage. Unfortunately, these devices suffer from a low fill factor [1]. To gain deeper understanding of the limiting factors we utilize steady-state current-voltage measurements to assess the electronic quality factor of devices with varying layer thickness by a recently described method [2]. In addition, we investigate the wavelength dependence of the loss mechanisms by voltage- and white-light-biased external quantum efficiency measurements.
[1] Scheunemann et al., Appl. Phys. Lett. 111 (2017) 183502.
[2] Kaienburg et al., Phys. Rev. Appl. 6 (2016) 024001.