Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster 1

CPP 12.68: Poster

Monday, September 5, 2022, 18:00–20:00, P1

Preparation of Highly Crystalline ZnO Thin Films at Low Temperatures using ZnO Nanoparticles to Enable High-Quality Organic Solar Cells On Flexible Substrates — •Emanuel Anwander, Lukas V. Spanier, and Peter Müller-Buschbaum — TU München, Physik-Department, Lehrstuhl für Funktionelle Materialien James-Franck-Straße 1, 85748 Garching

The possibility to build flexible light weight OSCs makes them very promising for aviation and aerospace applications. Therefore, inexpensive and scalable materials such as PET or PEN are desirable substrates. Conventional sol-gel preparation of ZnO thin films, which have proven to be the best choice for electron transport layers (ETLs) in inverted OSCs, requires annealing at temperatures up to 200°C. Since PET and PEN have glass transition temperatures of 69°C and 113°C, respectively, and are long term heat resistant at a maximum of 120°C and 155°C, respectively, a way to produce high-quality ZnO thin films at low temperatures is required. One approach to achieve this goal is to use a solution of pre-synthesized ZnO nanoparticles. These nanoparticles exhibit high crystallinity and thus good ZnO thin films that have higher charge carrier mobility and lower recombination rates than the sol-gel ZnO films can be formed at room temperature without annealing. This approach allows the realization of lightweight OSCs on flexible substrates that have the same or even higher efficiencies than conventional OSCs on rigid substrates with ETLs prepared using the sol-gel method.