SKM 2023 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 2: Organic Semiconductors (joint session HL/CPP)
HL 2.4: Talk
Monday, March 27, 2023, 10:15–10:30, POT 251
What's special about Y6; working mechanism of Neat Y6 organic solar cell — •Elifnaz Saglamkaya1, Artem Musiienko2, Mohammad Saeed Shadabrooa1, Bowen Sun1, Sreelakshmi Chandrabose3, Oleksandra Shargaieva4, Giulia Lo Gerfo M.5, Niek F. van Hulst5, and Safa Shoaee1 — 1University of Potsdam Disordered Semiconductor Optoelectronics Karl-Liebknecht-Strasse 24-25 14476 Potsdam-Golm — 2Department Novel Materials and Interfaces for Photovoltaic Solar Cells, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße 5, 12489 Berlin, Germany — 3University of Potsdam Physik und Optoelektronik weicher Materie Karl-Liebknecht-Straße 24-25 14476 Potsdam-Golm — 4Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, HySPRINT Innovation Lab, Department ``Solution Processing of Hybrid Materials & Devices'' (SE-ALM), Kekuléstr. 5, Berlin 12489, Germany — 5Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
In this study, we analyse the working mechanism of single component small molecule acceptor Y6 solar cells with power conversion efficiencies reaching up to 4.5% and short circuit currents up to 8.4 mAcm-2.Using Hall effect, photo-Hall, and photoinduced absorption (PIA) measurements, we show that the charge photo-generation occurs in the bulk of Y6. With the aid of space charge limited current (SCLC) measurements we show that Y6 has an ambipolar charge carrier mobility. Our data shows that the limiting factor for the power conversion efficiency is fast charge recombination, which can be suppressed in presence of the transport layers, or modifying the morphology with a solvent additive.