Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 92: Poster Session: Structure and transport in organic photovoltaics; Photovoltaics; Impurities/Amorphous semiconductors; New materials

HL 92.1: Poster

Donnerstag, 14. März 2013, 16:00–20:00, Poster A

Nanostructured metal oxides for hybrid solar cells — •Julian Reindl¹, Jonas Weickert¹, Andreas Wisnet², Sophia Betzler², Christina Scheu², and Lukas Schmidt-Mende¹ — ¹Hybrid Nanostructures, FB Physik, Universität Konstanz — ²Department of Chemistry and Center for Nanoscience, LMU München

Organic solar cells are an interesting technology to realize low-cost photovoltaics on a large scale. Even though efficiencies beyond 8 % have been achieved with a mixed film of donor and acceptor for thin films of about 100 nm, the unordered inner morphology of the active layer has detrimental effects in thicker layers due to more pronounced charge trapping and charge carrier recombination. A promising approach to realize thicker active layers with accordingly higher absorptivity is the hybrid solar cell concept, where the organic donor is substituted by a wide band gap metal oxide like titania (TiO2). Due to the small exciton diffusion length in organic semiconductors of usually 10-20 nm a structured donor-acceptor interface with this dimension is supposed to support efficient exciton separation and therefore lead to decreased recombination in these devices.

Here we present different approaches of fabricating a structured hybrid solar cell where we use either structured TiO2 wires with controllable dimensions or a structured transparent electrode underneath a thin TiO2 layer. The first attempt provides a crystalline acceptor matrix whereas the latter takes advantage of short pathways for electrons from the donor-acceptor interface to the collecting electrode.