Comprehensive Investigation of Silver Nanoparticle/Aluminum Electrodes for Copper Indium Sulfide/Polymer Hybrid Solar Cells

Mario Arar, Andreas Pein, Wernfried Haas, Ferdinand Hofer, Kion Norrman, Frederik C Krebs, Thomas Rath, Gregor Trimmel

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Abstract

Electrode materials are primarily chosen based on their work function to suit the energy levels of the absorber materials. In this paper, we focus on the modification of aluminum cathodes with a thin silver interlayer (2 nm) in copper indium sulfide/poly[(2,7-silafluorene)-alt-(4,7-di-2-thienyl-2,1,3-benzothiadiazole)] (PSiF-DBT) nanocomposite solar cells, which improves the fill factor compared to pure aluminum electrodes. A comprehensive structural investigation was performed by means of transmission electron microscopy and time-of-flight secondary ion mass spectrometry revealing the presence of silver nanoparticles in an aluminum oxide matrix between the absorber layer and the aluminum cathode. In combination with complementary optical investigations, the origin of the improvement is ascribed to a facilitated charge extraction.
Original languageEnglish
JournalThe Journal of Physical Chemistry Part C
Volume116
Issue number36
Pages (from-to)19191-19196
ISSN1932-7447
DOIs
Publication statusPublished - 2012

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