Kinetically Driven Near-unity Charge Generation Yield in Organic Solar Cells

Ardalan Armin; Wei Li; Stefan Zeiske; Oskar Sandberg; Drew Riley; Paul Meredith

doi:10.1117/12.2595721

1 August 2021 Kinetically Driven Near-unity Charge Generation Yield in Organic Solar Cells

Ardalan Armin, Wei Li, Stefan Zeiske, Oskar Sandberg, Drew Riley, Paul Meredith

Proceedings Volume 11799, Physical Chemistry of Semiconductor Materials and Interfaces XX; 1179919 (2021) https://doi.org/10.1117/12.2595721
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Abstract

Recent advances in organic solar cell material development based around non-fullerene electron acceptors in bulk heterojunctions have propelled power conversion efficiencies to >18%, with 20% on the horizon and 25% predicted. These efficiencies are close to traditional inorganic semiconductor photovoltaics and thus focus is now turning to manufacturability and creating a viable solar cell technology. In this presentation we report the highest efficiency to date (16% with a Fill Factor >70%) in a thick junction binary organic solar cell based upon PM6:BTP-eC9. Using a very accurate approach based upon temperature dependent ultra-sensitive EQE measurements we find that this system (and a similar one based upon PM6:Y6) have near unity charge generation yields (CGY > 99%). In this regime, we observe that a small increase in CGY of only 0.5% leads to a 2.5 times more reduction in bimolecular recombination relative to the Langevin limit enabling high efficiency thick junction solar cells.

Conference Presentation

Citation Download Citation

Ardalan Armin, Wei Li, Stefan Zeiske, Oskar Sandberg, Drew Riley, and Paul Meredith "Kinetically Driven Near-unity Charge Generation Yield in Organic Solar Cells", Proc. SPIE 11799, Physical Chemistry of Semiconductor Materials and Interfaces XX, 1179919 (1 August 2021); https://doi.org/10.1117/12.2595721

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