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 4.53: Poster
Donnerstag, 26. März 2009, 16:30–19:00, P1A
Investigation of heterojunction morphology in organic solar cells by 2D drift-diffusion simulations — •Manfred Gruber1,2, Bejamin A. Stickler1,2, Ferdinand Schürrer1, Gregor Trimmel2 und Karin Zojer1 — 1Department of Theoretical and Computational Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria — 2Christian Doppler Piotlabor für Nanokompositsolarzellen - Institut für Chemische Technologie von Materialien, Graz University of Technology, Stremayrgasse 16, 8010 Graz, Austria
The interface morphology of bulk heterojunctions in organic solar cells plays a crucial role in determining the fill factor and, thus, the quantum efficiency. To gain a better understanding of the influence of the interface morphology on the performance of solar cells, we calculated their I-V curves by means of a two-dimensional drift-diffusion model. The corresponding system of equations containing the Poisson equation and the continuity equations for electrons and holes is solved self-consistently on a two-dimensional rectangular mesh. The mesh cell extensions reflect the aspect ratio of the modelled device cross-section. By means of an idealized comb-shaped heterojunction, i.e., interdigited donor and acceptor phases, we discuss the influence of the digit aspect ratios, the recombination rates, and mobilities in the light of the local charge carrier and electric field distributions