Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Plasmonics and Nanooptics
O 36.4: Poster
Tuesday, March 17, 2015, 18:15–21:00, Poster A
Nano-photonic computations of light propagation and absorption in nano-structured hybrid solar cells — •Thomas Kiel1, Thomas Pfadler2, Martin Stärk2, Julia F. M. Werra1, Christian Matyssek1, Johannes Boneberg2, Lukas Schmidt-Mende2, and Kurt Busch1,3 — 1Humboldt-Universität zu Berlin, Institut für Physik, AG Theoretische Optik & Photonik, D-12489 Berlin, Germany — 2Universität Konstanz, D-78457 Konstanz, Germany — 3Max-Born-Institut, D-12489 Berlin, Germany
Nano-structured multilayer organic-inorganic solar cells are promising candidates for enhanced efficiency due to additional absorption features as compared to unstructured solar cells. We consider a common inverted solar cell material setup with a periodically nano-structured TiO2 grating, covered by a P3HT-PCBM blend as the active material and followed by PEDOT-PSS, which are enclosed by ITO and silver contacts. In this setup resonant absorption enhancement outside of the main optical absorption band of P3HT-PCBM is observed experimentally.
We perform numerical calculations solving Maxwells equations using the Discontinuous-Galerkin Time-Domain Method to provide explanations of the experimentally observed behavior. Specifically, in order to obtain deeper insight into the mechanisms involved we compute spatially resolved absorption profiles and investigate the influence of the TiO2 grating periodicity, which we compare to the experimental data.