Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 6: Poster: Structural Ordering and Electronic Transport (joint focus with HL)
CPP 6.7: Poster
Montag, 26. März 2012, 17:30–19:30, Poster A
Nanostructured Hybrid Solar Cells — •Jonas Weickert1,2, Andreas Wisnet1, Christina Scheu1, and Lukas Schmidt-Mende2 — 1Ludwig-Maximilians-University Munich, Munich, Germany — 2University of Konstanz, Konstanz, Germany
Organic solar cells have gained remarkable interest during the past two decades and have reached high power conversion efficiencies of 8%. However, efficiencies are still limited by relatively low absorptivity. Only thicker active layers could allow more complete photon harvesting. However, the active layer thickness of conventional organic solar cells is conceptually limited due to the relatively uncontrolled morphology of their active layers, which promotes charge carrier recombination for films thicker than 100-200 nm.
One way to overcome these limitations is the substitution of the organic acceptor material with wide band-gap semiconductors like TiO2 in so-called hybrid solar cells. TiO2 also acts as electron acceptor but can be nanostructured in order to meet the competing demands of high interfacial area and consistent pathways for charge transport.
TiO2 nanotubular arrays with dimensions comparable to exciton diffusion lengths in typical organic materials are synthesized on conductive glass substrates via electrochemical anodization of thin Ti films and can be readily infiltrated with donor material to realize ordered hybrid heterojunctions.
The properties of the metal oxide-organic junction can be further tuned by introduction of interfacial modifiers like dye molecules and are investigated in detail.