Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 9: Organic semiconductors I (joint session HL/CPP)
CPP 9.10: Talk
Monday, March 16, 2020, 12:15–12:30, POT 112
Comparing Charge Generation and Extraction in Y6 and LM11 Devices — •Seyed Mehrdad Hosseini1, Yingping Zou2, and Safa Shoaee1 — 1Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24-25, Potsdam-Golm D-14476, Germany — 2College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P.R. China
In the last few years, non-fullerene acceptors (NFA) have dominated organic solar cells. Whilst in thin films, exceptional fill-factor (FF) can be obtained, in thicker junctions however, FF is usually affected. Reduced FF is the manifestation of voltage-dependent charge photogeneration and/ or inefficient free charge extraction3. In this study, we compare two NFAs, named Y6 and LM11, when blended with PM6. Our results show that although PM6:LM11 device has a higher open-circuit voltage (Voc) than PM6:Y6, lower FF limits the efficiency. We employed time-delayed collection field (TDCF) measurements to reveal the reason behind the poorer FF in PM6:LM11 device by studying charge generation and recombination in both systems.