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Small molecule bulk heterojunction organic solar cells with coumarin-6 as donor material

: Beyer, Beatrice; Griese, Daniel; Schirrmann, Christian; Pfeifer, Richard; Kahmann, Simon; Hild, Olaf Rüdiger; Leo, Karl


Thin solid films 536 (2013), pp.206-210
ISSN: 0040-6090
Journal Article
Fraunhofer IPMS ()
Fraunhofer COMEDD; 2015 ()
organic solar cell; heterojunction; coumarin; photodiode

To leverage the potential of organic solar cells, suitable materials for the photoactive layers have to be found. Herein, we show that the well-known fluorescent dye 3-(2?-benzothiazolyl)-7-diethylaminocoumarin works as an efficient light absorber material with a sensitivity at wavelengths from 400 to 650 nm. In combination with doped transport layers and optimization of the photodiode stack, a power conversion efficiency up to 1.9% under air mass 1.5 and 100 mW/cm2 illumination could be achieved.