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Combined alternative electrodes for semi-transparent and ITO-free small molecule organic solar cells

: Kim, Y.H.; Sachse, C.; Zakhidov, A.A.; Meiss, J.; Zakhidov, A.A.; Müller-Meskamp, L.; Leo, K.


Organic Electronics 13 (2012), No.11, pp.2422-2428
ISSN: 1566-1199
Journal Article
Fraunhofer COMEDD; 2015 ()

We investigate various electrode combinations of bottom and top contacts for organic photovoltaic (OPV) cells. Silver (Ag), indium tin oxide (ITO), poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), and silver nanowires (AgNW) are used as bottom electrodes. As top electrodes, thin silver layers (t-Ag) and free-standing carbon nanotube (f-CNT) sheets are employed. The manufactured zinc phthalocyanine (ZnPc): fullerene C-60 small molecule bulk heterojunction OPV cells with different kinds of bottom electrodes show efficiencies of 1.9 similar to 2.2% and 1.1 similar to 1.5%, when comprised of t-Ag and f-CNT top contacts, respectively. We demonstrate alternative electrodes beyond ITO, silver, and aluminum, which can be readily used for organic photovoltaics technology.