Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 26: Organic Photovoltaics I
CPP 26.5: Vortrag
Mittwoch, 25. März 2009, 15:00–15:15, ZEU 222
Block copolymer templating: a bicontinuous double gyroid hybrid solar cell — •Edward Crossland1, Sabine Ludwigs1, Marc Hillmyer2, Ulrich Wiesner3, Henry Snaith4, and Ullrich Steiner5 — 1Freiburg Institute for Advanced Studies, Germany — 2University of Minnesota — 3Cornell University — 4University of Oxford — 5University of Cambridge
The conversion of light to electrical energy in hybrid solar cells based on organic-ceramic composites demands engineering of highly distributed, yet interconnected heterojunctions on the 10nm length scale. Microphase separation of block copolymers offers an extremely versatile bottom-up approach to high aspect ratio patterning of functional materials on these macromolecular scales in thin films. We fabricated highly ordered arrays of semiconductor nanostructures using selectively degradable block copolymers as porous electrochemical templates. Cylinder-forming poly(4-fluorostyrene)-b-(D,L-lactide) films were aligned using electric fields to template freestanding vertical nanowire arrays over 1μm long and 10nm in diameter while the network phase of a bicontinuous double gyroid morphology could be replicated without external alignment. Charge transport and recombination rates as well as photovoltaic power conversion efficiencies were probed in each morphology incorporated into dye sensitized solid-state and liquid-electrolyte solar cells. These results mark the first successful application of the gyroid morphology in a functioning electronic device. This templating technique is fully extendable to a enormous range of potentially high performance heterojunction systems.