Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 69: Poster Session: II-VI semiconductors; Organic semiconductors; Heterostructures

HL 69.16: Poster

Mittwoch, 13. März 2013, 16:00–20:00, Poster A

Excitation of surface plasmon polaritons via prism coupling and metallic nanostructures for applications in organic solar cells — •Michael Mayr, Björn Gallheber, Mark Gruber, and Wolfgang Brütting — University of Augsburg, Germany

Organic photovoltaic cells based on diindenoperylene (DIP) exhibit high crystallinity in thin films resulting in long-range exciton transport and high charge carrier mobilities^1,2. Due to nearly perpendicular orientation of the transition dipole moment with respect to the substrate, however, DIP exhibits only weak absorption for direct illumination, but tends to couple strongly to the near-field of surface plasmon polaritons (SPPs). Moreover, DIP provides a low lying HOMO and LUMO, which results in high open circuit voltages when using it as acceptor in combination with commonly used donor materials like oligo- or polythiophenes³. This makes DIP a promising candidate for using SPPs to increase the efficiency of organic solar cells. Due to the need for conservation of momentum and energy, light induced far-field excitation of SPPs at metal/dielectric medium interfaces is impossible. We use glass prisms and metallic nanostructures made by nanosphere lithography to overcome this problem, as they can manipulate the in-plane wave vector of incident photons to fulfill this condition. Particularly metallic nanostructures permit tuning of the excited SPPs by adjusting the size of the used nanospheres.
¹ J. Wagner et al. Adv. Func. Mater. 20, 4295 (2010).
² D. Kurrle et al. Appl. Phys. Lett. 92, 133306 (2008).
³ U. Hörmann et al. phys. stat. sol. RRL 5, 241 (2011).