Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Crystallization, Nucleation and Self Assembly II (joint session CPP, DY)

CPP 14.9: Talk

Monday, March 16, 2015, 18:15–18:30, PC 203

Crystallization kinetics in printed active layers for organic solar cells — •Stephan Pröller¹, Feng Liu², Chenhui Zhu³, Peter Müller-Buschbaum⁴, Thomas P. Russell², Alexander Hexemer³, and Eva M. Herzig¹ — ¹Technische Universität München, Munich School of Engineering, 85748 Garching, Germany — ²University of Massachusetts Amherst, Department of Polymer Science and Engineering, MA 01003 Amherst, Massachusetts, USA — ³Lawrence Berkeley National Laboratory, Advanced Light Source, CA 94720 Berkeley, California, USA — ⁴Technische Universität München, LS Funktionelle Materialien, 85748 Garching, Germany

Organic solar cells are a promising alternative to silicon based inorganic ones. Among other advantages like high absorption, a key advantage is the processability out of solution. This allows for printing of large area photovoltaic devices at low costs at low energy input. The morphology and crystalline properties of the active layer is of utmost importance for the functionality like exciton separation or charge carrier transport and thus for the performance of the produced devices. So far, not much is known on the crystallization kinetics of printed organic photoactive layers. Using an industrial slot-die printing process we studied the morphology evolution of a photoactive blend by in-situ X-ray scattering methods. With these experiments we are able to picture the process of crystallization of the polymer blend. We identified different stages during crystallization and propose a model for the crystal growth. This understanding is important to gain control over the morphology development of the system to improve organic solar cell performance.