4.6 Article

Size effects of imidazolium cations bearing cyanoethyl group on performance of dye-sensitized solar cells

Journal

MATERIALS LETTERS
Volume 246, Issue -, Pages 137-140

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2019.03.062

Keywords

Dye-sensitized solar cells; Imidazolium ionic liquids; Electrolyte cations; Size effect; Electron injection

Funding

  1. Korea Center for Artificial Photosynthesis (KCAP) in Sogang University - Minister of Science, ICT and Future Planning (MSIP) through the National Research Foundation of Korea [2009-0093883]

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Imidazoliums are commonly used ionic liquid cations in electrolyte in dye-sensitized solar cells (DSSCs). Here, the size effects of imidazolium cations bearing the cyanoethyl group on DSSC performance have been systematically investigated by introducing the different alkyl chains (C1-C12), by which size control is allowed in a range of 9-20 angstrom. The large cations slow down electron recombination and ion diffusion, but, unexpectedly, they suppress downward shift of TiO2 conduction band significantly affecting on electron injection process. While all the cations used in this work demonstrate a better power conversion efficiency than that for the common imidazolium analogue, the interplay among the key processes results in the best performance with the medium-sized cation C4 (11 angstrom). This work paves a way for design of efficient electrolyte cations for photovoltaic devices. (C) 2019 Elsevier B.V. All rights reserved.

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