Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Organic Semiconductors

CPP 8.14: Poster

Monday, March 14, 2011, 17:30–19:30, P2

Photophysical Study on Core-Enlarged-Rylendiimides and -Anhydrides for Dye Sensitized Solar Cells — •Belinda Nölscher, Michael Meister, Ian Howard, Glauco Battagliarin, Chen Li, Klaus Müllen, and Frédéric Laquai — Max Planck Institute for Polymer Research, Mainz, Germany

Dye Sensitized Solar Cells (DSSCs) are promising devices for light-weight and cheap photovoltaic energy conversion. Up to now many different dyes have been synthesized to improve the efficiency of these solar cells. Investigation of the relation between the photophysical properties of the dyes and their performance in solar cells is required for a better understanding of the working principle of DSSCs.

In this contribution we present a photophysical study on novel core-enlarged-rylenediimides and -anhydrides [1]. By changing the core size or expanding the bay-position the absorption maximum can be tuned and further shifted into the red part of the solar spectrum. We employ transient and steady-state photoinduced absorption as well as time-resolved photoluminescence spectroscopy to investigate the dynamics of charge generation and recombination of these dyes in solid-state DSSCs. Theoretically a higher efficiency of core-enlarged dyes due to increased photon harvesting can be expected, however, it appears that these dyes follow a different trend. Based on our results we draw conclusions for future material development of higher efficiency all-organic dyes for DSSCs.

[1] Synthesis and application of core-enlarged perylene dyes, Y. Avlasevich, C. Li, K. Müllen, Journal of Materials Chemistry