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Proceedings Paper

Cyanine dyes in solid state organic heterojunction solar cells
Author(s): Jakob Heier; Chuyao Peng; Anna C. Véron; Roland Hany; Thomas Geiger; Frank A. Nüesch; Marcus V. G. Vismara; Carlos F. O. Graeff
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Paper Abstract

Today numerous cyanine dyes that are soluble in organic solvents are available, driven by more than a century of research and development of the photographic industry. Several properties specific to cyanine dyes suggest that this material class can be of interest for organic solar cell applications. The main absorption wavelength can be tuned from the ultra-violet to the near-infrared. The unparalleled high absorption coefficients allow using very thin films for harvesting the solar photons. Furthermore, cyanines are cationic polymethine dyes, offering the possibility to modify the materials by defining the counteranion. We here show specifically how counterions can be utilized to tune the bulk morphology when blended with fullerenes. We compare the performance of bilayer heterojunction and bulk heterojunction solar cells for two different dyes absorbing in the visible and the near-infrared. Light-induced Electron Spin Resonance (LESR) was used to study the charge transfers of light induced excitons between cyanine dyes and the archetype fullerene C60. LESR results show good correlation with the cell performance.

Paper Details

Date Published: 6 October 2014
PDF: 10 pages
Proc. SPIE 9184, Organic Photovoltaics XV, 918408 (6 October 2014); doi: 10.1117/12.2063977
Show Author Affiliations
Jakob Heier, EMPA (Switzerland)
Chuyao Peng, EMPA (Switzerland)
Anna C. Véron, EMPA (Switzerland)
Roland Hany, EMPA (Switzerland)
Thomas Geiger, EMPA (Switzerland)
Frank A. Nüesch, EMPA (Switzerland)
Marcus V. G. Vismara, Univ. Estadual Paulista Júlio de Mesquita Filho (Brazil)
Carlos F. O. Graeff, Univ. Estadual Paulista Júlio de Mesquita Filho (Brazil)


Published in SPIE Proceedings Vol. 9184:
Organic Photovoltaics XV
Zakya H. Kafafi; Paul A. Lane; Ifor D. W. Samuel, Editor(s)

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