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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: Organic Electronics and Photovoltaics II

CPP 31.7: Vortrag

Mittwoch, 20. März 2024, 16:45–17:00, H 0110

Identify the losses occurring in all-polymer solar cells — •Shahidul Alam¹, Wejdan Althobaiti¹, Safakath Karuthedath^1,2, 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