Organic Optoelectronic Thin Film Devices  
Organic Solar Cells using Cyanine Dyes
Transparent Organic Solar Cells
Cyanine Dye Ionic Junctions for Organic Electronic
Transparent Organic Photodiodes

Organic solar cells using cyanine dyes



Over the last years, we achieved considerable improvements in the performance of cyanine dye / C60 bilayer heterojunction solar cells.  We optimized the performance by oxidative doping of the cyanine layer. Doping increased the film conductivity and induced a steep rise in the short-circuit current and the open-circuit voltage. We argued that cyanine aggregates may be responsible for efficient charge transport to the heterointerface. We described a simple process to match the energy to the low-lying cyanine level by using a thin organic salt layer or doped polyaniline as anode buffer layer. Thereby, hole injection was facilitated and good-performing devices (efficiency = 3%) with a high fill factor (FF = 60%) were fabricated. Recently, we demonstrated inverted bilayer cell architectures with an efficiency of 3.7% and cyanine / cyanine tandem devices with over 4% performance.

The figure shows the architecture of an inverted cyanine solar cell and the J-V characteristics under 1 sun illumination with Jsc = 6.2 mA cm-2, Voc = 0.88 V, FF = 67.8% and ç = 3.7%.



F. A. Castro et al., Phys. Chem. Chem. Phys. 2009, 11, 8886; B. Fan et al., Org. Electronics 2010, 11, 583; B. Fan et al., J. Mater. Chem. 2010, 20, 2952; R. Hany et al., Prog. Photovolt: Res. Appl. 2011, 19, 851; E. Berner et al, Appl. Phys. Lett. 2013, 102, 183903; L. Wang et al., Polymer 2014, 55, 3195; S. Jenatsch et al., J. Phys. Chem. C 2014, 118, 17036; H. Zhang et al., Adv. Energy Mater. 2014, 1400734.

Charge Mobility Determination in Cyanine/C60 Bilayer Solar Cells Using Photo-CELIV Technique (Poster)



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