Dresden 2009 – wissenschaftliches Programm
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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 4: Organic Photovoltaics: from Single Molecules to Devices
SYOP 4.76: Poster
Donnerstag, 26. März 2009, 16:30–19:00, P1A
Bulk-Heterojunction Organic Solar Cells Based on Merocyanine Colorants — •Nils M. Kronenberg1, Hannah Bürckstümmer2, Elena V. Tulyakova2, Manuela Deppisch2, Frank Würthner2, Hans W. A. Lademann1, and Klaus Meerholz1 — 1Department für Chemie, Universität zu Kön, Germany — 2Institut für Organische Chemie, Universität Würzburg, Germany
To take advantage of the full potential of organic Bulk Heterojunction (BHJ) solar cells, there is a need to explore new materials. We introduced merocyanines dyes (MCs) as a new class of electron donor materials for the application in solution-processed BHJ solar cells. MCs are traditional low-molecular colorants that are widely applied in textile coloration, for printing purposes, and nonlinear optics.
Due to their structure, consisting of an electron-donating and an electron-accepting subunit, they possess high absorption coefficients which is favorable for the use in solar cells. The vast variety of the MC synthesis allows for a variation of the absorption properties in a wide range and a tuning of the solar cell absorption to the emission spectrum of the sun. Another advantage of MCs compared to some long-wavelength absorbing polymers is the relatively low HOMO-energy (down to -6.0 eV), which is beneficial for large open-circuit voltages.
We tested various different MC-dyes in the application as donor compound in BHJ solar cells in combination with the soluble C60 derivative PCBM. Power conversion efficiencies up to 2.1% under standard illumination and 2.7% at reduced intensities were achieved.