Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster 1

CPP 12.66: Poster

Montag, 5. September 2022, 18:00–20:00, P1

Possibilities and limitations for the alignment of polymer chains in photovoltaic materials — •Robin Teichgreber, Fabian Eller, and Eva M. Herzig — Dynamik und Strukturbildung - Herzig Group, Universität Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany

The arrangement of the polymer chains on the nanoscale in thin films influences the optical and electrical properties of the material in a decisive way. For efficient charge transport, a sufficient alignment of the polymers is necessary. Due to the sensitive nature of the microstructure to various influencing variables such as concentration, solubility, and temperature, this goal presents an experimental challenge. However, a deliberate alignment will allow to probe optical and electric photovoltaic properties more systematically. Li et al. [1] have shown that thin films with a high degree of alignment can be produced via dip-coating by varying the coating speed and concentration using the polymer PII-2T. The simple nature of the dip-coating process makes it attractive, also for other polymers, should similar results be obtainable. Here, it will be shown which results can be obtained in a dip-coating based process with P3HT and high performance polymers like PM6. For this purpose, different influencing variables such as coating speed, concentration, solvent quality and temperature are evaluated. In addition, the process is extended to include pre-processing and post-processing steps.

[1] Li, Qi-Yi; Yao, Ze-Fan; Lu, Yang; Zhang, Song; Ahmad, Zachary; Wang, Jie-Yu; et al. Adv. Electron. Mater., 6 (6), 2000080, 2020