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11 September 2013 Control of light absorption in organic solar cells using semi-transparent metal electrodes
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Abstract
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.
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Stefanie Neutzner, Jorik van de Groep, Artem A. Bakulin, and 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
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