Dresden 2011 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 42: Poster I: Progress in Micro- and Nanopatterning: Techniques and Applications (jointly with O); Spins in Organic Materials; Ion Interactions with Nano Scale Materials; Organic Electronics and Photovoltaics; Plasmonics and Nanophotonics (jointly with HL and O); High-k and Low-k Dielectrics (jointly with DF); Organic Thin Films; Nanoengineered Thin Films; Layer Deposition Processes; Layer Properties: Electrical, Optical, and Mechanical Properties; Thin Film Characterisation: Structure Analysis and Composition; Application of Thin Films
DS 42.19: Poster
Mittwoch, 16. März 2011, 15:00–17:30, P1
Integration of self-assembled photonic structures in excitonic solar cells — •Stefan Guldin1, Sven Hüttner1, Peter Kohn1, Morgan Stefik3, Pablo Docampo2, Henry Snaith2, Ulrich Wiesner3, and Ullrich Steiner1 — 1Physics Department, Cavendish Laboratory, University of Cambridge, UK — 2Physics Department, Clarendon Laboratory, University of Oxford, UK — 3Materials Science Department, Cornell University, Ithaca, NY, USA
One way to successfully enhance light harvesting of excitonic solar cells in otherwise poorly absorbing spectral regions is the integration of optical elements in the device architecture. Recently concepts for the incorporation of one- or three-dimensional photonic crystal structures have been proposed which are geared towards enhancing absorption in specific parts of the optical spectrum while retaining the cell transparency.
In this work we present a novel route for the fabrication of a photonically active, mesoporous TiO2 architecture from solution. The method relies on on the self assembly properties of the block copolymer PI-b-PEO in combination with sol-gel chemistry. When deposited in a layer-by-layer fashion, porosity and pore size of each individual coating can be controlled in detail, which enables the stacking of alternating high and low refractive index layers of TiO2. The effects of such a highly reflecting one-dimensional photonic crystal on light absorption properties and cell efficiency of dye-sensitised solar cells will be discussed in detail.