Tuning pentacene based dye-sensitized solar cells

Andreas Kunzmann, Marco Gruber, Rubén Casillas, Rik R. Tykwinski, Rubén D. Costa, Dirk M. Guldi

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5 Citations (Scopus)

Abstract

We report on the synthesis, as well as photophysical and electrochemical characterization of a new family of pentacene derivatives, which are applied in n-type dye-sensitized solar cells (DSSCs). As far as the molecular structure of the pentacene is concerned, the synthetic design focuses on cyano acrylic tethered at the 13-position of the pentacene chromophore. The electrolyte composition features increasing amounts of Li+ ions as an additive. In general, the increase of Li+ concentrations extrinsically reduces the quasi Fermi level of the photoanode and as such facilitates the electron injection process. We demonstrate that pentacene derivatives give rise to a unique charge injection process, which is controlled by the positioning of the quasi Fermi level energies as a function of the Li+ concentration. As a result of the enhanced charge injection, device efficiencies as high as 1.5% are achieved, representing a 3-fold increase from previously reported efficiencies in pentacene-based DSSCs. These findings are supported by device analysis in combination with transient absorption and electrochemical impedance spectroscopy assays.

Original languageEnglish
Pages (from-to)8515-8525
Number of pages11
JournalNanoscale
Volume10
Issue number18
DOIs
Publication statusPublished - 2018 May 14
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)

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  • Cite this

    Kunzmann, A., Gruber, M., Casillas, R., Tykwinski, R. R., Costa, R. D., & Guldi, D. M. (2018). Tuning pentacene based dye-sensitized solar cells. Nanoscale, 10(18), 8515-8525. https://doi.org/10.1039/c8nr01502c