Dresden 2009 – scientific programme

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.68: Poster

Thursday, March 26, 2009, 16:30–19:00, P1A

Small Bandgap aza-Bodipy in Organic Solar Cells — •Toni Mueller, Roland Gresser, Moritz Riede, Horst Hartmann, and Karl Leo — Institut für Angewandte Photophysik, Technical University of Dresden, George-Bähr-Straße 1, 01069 Dresden, Germany

Extending the available part of the spectral range to the infrared plays an essential role for increasing the efficiency of organic solar cells. However, the choice of efficient organic materials absorbing above 800nm is still scarce, especially for small molecules.

In this work we have investigate a series of aza-Bodipy (4,4-Difluoro-4-bora-3a,4a,8-triazaindacene) as absorber materials in organic solar cells. UPS-data shows that the position of the materials' HOMO can be intentionally varied by the choice of the functional group attached to the aza-Bodipy, and, thus, changing the optical bandgap. Consequently, the external quantum efficiency of these solar cells is bathochromically shifted. Mobility and conduction measurements on the aza-Bodipy show good values and first heterojunction solar cells with doped transport layers (p-i-n structure) incorporating these materials, e.g. in combination with the fullerene C60, show spectral response above 800nm.