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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics VI
CPP 48.4: Talk
Thursday, March 12, 2026, 12:15–12:30, ZEU/LICH
Additives to enhance efficiency and stability of PPDT2FBT:PC60BM organic solar cells — •Hassan Ismail1,2, Jose Prince Madalaimuthu1,2, Ulrich Schubert1,2, and Harald Hoppe1,2 — 1Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstrasse 10, 07743 Jena, Germany — 2Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
The development of organic solar cells (OSCs) requires simultaneous optimization of photovoltaic performance and long-term thermal stability, often mediated by processing solvents and additives. This study investigates the role of small amphiphilic molecules (AMs) as surfactants in stabilizing the bulk heterojunction morphology of PPDT2FBT:PCBM-based OSCs. Our research goal is to understand how the chemical nature of AMs and their interface engineering within the device affect stability and efficiency. We demonstrate that the AM's polar headgroup chemistry is a critical determinant for operational stability, and by strategically applying interface engineering across all major interfaces, we identify optimal scenarios for enhancing both efficiency and device durability. Interface engineering not only improves charge transport and mitigates degradation but also supports large-area fabrication and practical device reliability, addressing prominent challenges for commercialization. These findings guide future molecular design and interface engineering strategies, contributing to the realization of more robust and reliable organic solar cells.
Keywords: Organic Solar Cells; PPDT2FBT polymer donor; Amphiphilic molecules; Thermal stability; Morphology