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Crystallization and Structure Formation in Donor-Acceptor Block Copolymers for Applications in Organic Photovoltaics

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If you have a question about this talk, please contact Tracy Inman .

Polymer solar cells require a nanoscale structure of donor and acceptor materials in order to achieve efficient charge separation. This is often realized in quenched phase separated blend systems. The exact adjustment of the morphology in this case is an empirical process and the resulting two-phase structure corresponds thermodynamically to a non-equilibrium state. We explore the possibility to use the self-assembly of block copolymers comprising materials that are good electron and hole conductors to generate thermodynamically stable, nanoscale donor and acceptor domains on the scale of the exciton diffusion length. While some initial devices have been fabricated, detailed understanding of the complex process of structure formation processes in such materials is often lacking. We present a detailed structural study on a donor-acceptor block copolymer and related model materials, using small and wide angle x-ray scattering in combination with AFM . We discuss similarities and differences with many common block copolymers undergoing a liquid-liquid microphase separation.

This talk is part of the BSS Formal Seminars series.

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