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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 31: Organic Electronics and Photovoltaics II
CPP 31.7: Talk
Wednesday, March 20, 2024, 16:45–17:00, H 0110
Identify the losses occurring in all-polymer solar cells — •Shahidul Alam1, Wejdan Althobaiti1, Safakath Karuthedath1,2, Ning Su3, Christopher E. Petoukhoff1, José P. Jurado1, Oleksndr Matiash1, Amr Dahman1, Khawla Alkhezaim1, Vladimir Dyakonov4, Andreas Sperlich4, Vojtech Nádaždy5, Tobin J. Marks3, Antonio Facchetti3, and Frédéric Laquai1 — 1KAUST, Kingdom of Saudi Arabia — 2Tsinghua University, Shenzhen, China — 3Northwestern University, USA — 4University of Wurzburg, Germany — 5Slovak Academy of Sciences, Slovak Republic
For unknown reasons, small molecule non-fullerene acceptor-based bulk heterojunction OSCs are ahead of all-polymer solar cells. Here, blends of the donor polymers PCE12 and PM6 with two acceptor polymers, PYN-BDT and PYN-BDTF, are used to study PCE-limiting processes in solar cells. The π-extended naphthalene rings in these compounds make them macromolecular absorbers with large optical cross-sections up to 900 nm. Combining steady-state optical spectroscopy, TRPL, TA, ESR, and TDCF experiments provides a concise and quantitative assessment of losses due to limited photon absorption, geminate and non-geminate recombination (NGR), field-dependent charge generation, and inefficient carrier extraction. Pulsed-laser spectroscopy kinetic parameters reproduce experimentally measured device IV characteristics and show that low FFs are caused by NGR competing with charge extraction or a strong field dependence of charge generation, depending on the acceptor polymer.
Keywords: Organic Solar Cells; Non-fullerene Acceptors; All Polymer Solar Cells