Dresden 2009 – wissenschaftliches Programm

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.4: Poster

Donnerstag, 26. März 2009, 16:30–19:00, P1A

Structure control of conjugated block copolymers via adding a homopolymer — •Matthias A. Ruderer¹, Robert Cubitt², and Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department LS E13, James-Franck-Str. 1, 85747 Garching (Germany) — ²Institute Laue Langevin, 6 Jules Horowitz, 38042 Grenoble (France)

Conjugated polymers have shown to be interesting candidates for organic photovoltaics due to their high absorption coefficient and easy processibility. Nevertheless there are stringent constraints in the morphology of the active layer due to the short exciton diffusion length (on the order of 10 nm). While polymer blends tend to form structure sizes in the range of hundred nanometers, one promising approach are conjugated block copolymers which generate nanostructures in the desired range due to micro-phase separation.[1] Instead of changing the composition of the block copolymer via synthesis, an alternative approach is offered by blending the conducting block copolymer with a homopolymer which is equal to one of the blocks to adapt the morphology and match the desired spatial dimensions. A diblock copolymer with a rigid conjugated block and a conventional coiled block is focused. We investigate the structural changes due to blending this block copolymer with the coiled block homopolymer of smaller degree of polymerization using the non destructive methods grazing incidence small angle neutron scattering (GISANS) and neutron reflectivity.[2] The investigations are completed with AFM and UV/Vis measurements.

[1] S. Günes et al., Chem. Rev. 107, 1324 (2007); [2] P. Müller-Buschbaum et al., Langmuir 22, 9295 (2006)