Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Organic Semiconductors

CPP 8.33: Poster

Montag, 14. März 2011, 17:30–19:30, P2

Nanowire Networks as a Transparent Electrode for Organic Solar Cells — •Christoph Sachse, Yong-Hyun Kim, Lars Müller-Meskamp, and Karl Leo — Institut für Angewandte Photophysik, Dresdner Innovationszentrum Energieeffizienz, TU Dresden, 01062 Dresden, Germany

For a broad application of organic thin film solar cells, inexpensive roll-to-roll processing on flexible and lightweight substrates is desirable. On these flexible substrates, commonly used ITO electrodes do not show satisfying performance due to the brittle nature of anorganic oxides.

Among other alternatives, recently some promising results using silver-nanowires as a conductive layer were published [1]. Such close-meshed metal grids are capable of combining the high conductivity of metals with the transparency caused by low surface coverage. Ontop, the solution based process guarantees low manufacturing costs.

Here, we evaluate and improve this alternative electrode material for organic solar cells. We achieve suitable film homogeneities with a simple dip or spray-coating process on different substrates. After post-processing an ITO-like performance is obtained.

Apart from the optimization of the electrode parameters, the thin organic solar cell stack imposes special requirements on the electrode technology. Therefore, our established small molecule technology [3] is used to evaporate organic solar cells on the nanowire electrodes and measure their performance to find suitable combinations.

[1] J.-Y. Lee, et al., Nano Lett. 8, 689 (2008).

[2] M. Riede, et al., Nanotechnology 19, 424001 (2008).