Conjugated diblock copolymer/fullerene bulk heterojunction system in organic photovoltaic application

Rui Wang^a, Zhenyu Di^a, Henrich Frielinghaus^a, Dieter Richter^a, Peter Müller-Buschbaum^b

^aJülich Center of Neutron Science, Lichtenberstrasse 1, Garching bei München, 85747, Germany

^bE13, Physik department, TU München, James-Franck-Str. 1, Garching bei München, 85748, Germany

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Rui Wang, 105
Publication date: 5th February 2015

Organic photovoltaic attracts worldwide research interest due to its potential for low-cost fabrication process, lightweight and flexible applications. The inner morphology in the electron donor-acceptor layer guarantees the final device performance. In order to achieve optimum energy conversion efficiency, what required is not a two-phase system, but an interpenetrating bulk heterojunction (BHJ) network, in which the nanoscale morphology is constrained in the same scale of exciton diffusion length (~10 nm). Meanwhile, the interpenetrating network provides larger interface area for exciton dissociation. In the traditional P3HT/PCBM BHJ system, apart from pure P3HT and pure PCBM phase, there also contains a very fast diffusion mechanism of PCBM molecule into the amorphous part of P3HT.¹Consequently, the neutron scattering contrast between the two blocks of copolymer is enhanced.² In this present work, we blend the conjugated diblock copolymer P3HT-b-PS with fullerene derivative PCBM, by applying grazing incidence small angle neutron scattering to investigate the detailed structures, such as phase information, structure length scales and molecular miscibility between the components.
2d GISANS patterns of P3HT-b-PS/PCBM BHJ films.
1. Matthias, A. R.; Rober, M.; Lionel, P.; Robert, C.; Peter M.-B. Phase Separation and Molecular Intermixing in Polymer-Fullerene Bulk Heterojunction Thin Films. J. Phys. Chem. Lett. 2012, 3, 683-688. 2. Peter, M.-B. Grazing incidence small-angle neutron scattering: challenges and possibilities. Polymer Journal (invited review) 2013, 45, 34-42.

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