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In this contribution we combine optical modeling and device fabrication/characterization techniques to
demonstrate that semitransparent metal electrodes can improve light harvesting in organic photovoltaic (OPV)
devices. We show that inverted P3HT:PCBM solar cells using a thin ~8 nm silver film as a front electrode outperform
the ITO-based devices, despite the lower transmittance of silver films in comparison to ITO. The
variation of silver thickness allows tailoring the field distribution inside the cell, which leads to a broad
resonance window where the absorption is enhanced. Thereby the short-circuit current was increased by 84%
and the solar-cell efficiency was doubled. These results show that semitransparent metal electrodes can be
efficiently used for light trapping and also form a very promising alternative to ITO in OPV devices. The
stacked silver electrodes used in this work are flexible and can be easily produced on a large scale, including
printing techniques.
Stefanie Neutzner,Jorik van de Groep,Artem A. Bakulin, andHuib J. Bakker
"Control of light absorption in organic solar cells using semi-transparent metal electrodes", Proc. SPIE 8811, Physical Chemistry of Interfaces and Nanomaterials XII, 881119 (11 September 2013); https://doi.org/10.1117/12.2023650
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Stefanie Neutzner, Jorik van de Groep, Artem A. Bakulin, Huib J. Bakker, "Control of light absorption in organic solar cells using semi-transparent metal electrodes," Proc. SPIE 8811, Physical Chemistry of Interfaces and Nanomaterials XII, 881119 (11 September 2013); https://doi.org/10.1117/12.2023650