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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.19: Poster
Montag, 27. März 2023, 18:00–20:00, P3
Influence of amphiphilic additives on P3HT:PC60BM organic solar cells — •Jose Prince Madalaimuthu1,2, Zhuo Xu1,2, Ulrich S. Schubert1,2, and Harald Hoppe1,2 — 1Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstr. 10, D-07743 Jena, Germany — 2Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, D-07743 Jena, Germany
The mechanical stability of the layer stack is a significant barrier to the continued functioning of flexible OPVs. Delamination processes have the potential to significantly reduce photovoltaic performance. High-crystallinity polymers retain blend morphologies for a long time but yield brittle thin films. Amorphous polymers produce more flexible films but have less morphological stability. Device performance is associated with high crystallinity and superior charge carrier mobility. Furthermore, the elasticity required for mechanical stability is often improved with more amorphous polymers. This seems to split the necessary material characteristics in two. The objectives of the investigations are to improve mechanical resilience by lowering the tensile modulus and reducing crystallization by introducing tiny amounts of amphiphilic plasticizers. The effect of amphiphilic small molecule additions in donor-acceptor blends was investigated for toluene sulfonic acid (TSA) and then with a series of perylenes with systematically varying amphiphilicity. Enhancing the device's performance and long-term stability illustrates that the active layer's morphology can be regulated by the presence of amphiphilic additives.