Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 59: Poster Session III (Nanotribology; Polymeric biomolecular films; Organic electronics and photovoltaics, Covalent networks on surfaces; Phase transitions; Particles and clusters; Transparent conductive oxides)
O 59.10: Poster
Wednesday, March 16, 2011, 17:30–21:00, P3
Multi-plasmon enhancement of thin film organic solar cells — •Adam Williamson1, Erich Runge1, Eadaoin McClean2, and Dominic Zerulla2 — 1Institut für Physik and Institut für Mikro- und Nanotechnologien, Technische Universität Ilmenau, 98693 Ilmenau, Germany — 2University College Dublin, Belfield, Dublin 4, Ireland
A theoretical, two-dimensional (2D), periodic nano-structured design for thin film organic solar cells is presented. In this design the superposition of two periodic silver plasmonic gratings is seen to strongly increase the absorptive dissipation around two selectable wavelengths in the sub bandgap region. Finite-difference time domain (FDTD) calculations were found to be comparable to analytical predictions of the plasmon dispersion relation for the system which were calculated with an averaged dielectric permittivity. A method for tuning the strength of the generated plasmons is demonstrated by controlling the ratio of silver to active material within the grating layer. Profile cross-sections illustrate areas of the active layer exhibiting an increase of 40 times the absorptive dissipation compared to a non-grating cell structure. The areas of strongest increase in absorptive dissipation are visible next to the cell exit interfaces, as desired for a reduction in recombination losses.