Regensburg 2010 – scientific programme

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DS: Fachverband Dünne Schichten

DS 45: Organic Thin Films II

DS 45.3: Talk

Friday, March 26, 2010, 12:30–12:45, H8

Optimized light harvesting in thin film organic solar cells - modeling and experimental results — •André Merten, Uwe Dirks, Mauro Furno, Jan Meiss, Ronny Timmreck, Rico Schüppel, Karl Leo, and Moritz Riede — Institut für Angewandte Photophysik, Technische Universität Dresden

Optimal light absorption in the intrinsic layers of organic thin film solar cells is one of the basics for reaching high power conversion efficiencies.

However, multilayer interference phenomena have to be taken into account when designing the solar cell stack. Especially in the case of tandem solar cells, consisting of subcells with spectral complementary absorbers, interference effects have to be considered for current matching of the both subcells.

We present results of organic solar single and tandem solar cells, based on small molecules, which are designed and optimised by means of optical simulations based on a transfer-matrix-algorithm.

The optical simulation is verified by electrical characterization of solar cells with variation in layer thickness and by determining the spectral absorption by reflectance measurements with a fiber optical set-up, which also offers a validation of the layer deposition procedure at functional devices.

In addition to well controlled film thicknesses, the optical constants of the used organic materials are crucial for the optical simulation. Therefore, particular attention has to spend when determining theses constants and we present a sensitivity analysis for the predicted current densities with respect to errors in the optical constants.