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Molecular engineering of cyanine dyes to design a panchromatic response in Co-sensitized dye-sensitized solar cells

Journal Article · · Molecular Systems Design & Engineering
DOI:https://doi.org/10.1039/C6ME00014B· OSTI ID:1352871
 [1];  [2];  [3];  [1]
  1. Univ. of Cambridge (United Kingdom). Cavendish Lab.
  2. Univ. of Cambridge (United Kingdom). Cavendish Lab.; Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Univ. of Cambridge (United Kingdom). Cavendish Lab.; Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW (Australia)
Cyanines are optically tunable dyes with high molar extinction coefficients, suitable for applications in co-sensitized dye-sensitized solar cells (DSCs); yet, barely thus applied. This might be due to the lack of a rational molecular design strategy that efficiently exploits cyanine properties. This study computationally re-designs these dyes, to broaden their optical absorption spectrum and create dye···TiO2 binding and co-sensitization functionality. This is achieved via a stepwise molecular engineering approach. Firstly, the structural and optical properties of four parent dyes are experimentally and computationally investigated: 3,3’-diethyloxacarbocyanine iodide, 3,3’-diethylthiacarbocyanine iodide, 3,3’-diethylthiadicarbocyanine iodide and 3,3’-diethylthiatricarbocyanine iodide. Secondly, the molecules are theoretically modified and their energetics are analyzed and compared to the parent dyes. A dye···TiO2 anchoring group (carboxylic or cyanoacrylic acid), absent from the parent dyes, is chemically substituted at different molecular positions to investigate changes in optical absorption. We find that cyanoacrylic acid substitution at the para-quinoidal position affects the absorption wavelength of all parent dyes, with an optimal bathochromic shift of ca. 40 nm. The theoretical lengthening of the polymethine chain is also shown to effect dye absorption. Two molecularly engineered dyes are proposed as promising co-sensitizers. Finally, corresponding dye···TiO2 adsorption energy calculations corroborate their applicability, demonstrating the potential of cyanine dyes in DSC research.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Engineering and Physical Sciences Research Council (EPSRC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1352871
Journal Information:
Molecular Systems Design & Engineering, Journal Name: Molecular Systems Design & Engineering Journal Issue: 1 Vol. 1; ISSN 2058-9689
Country of Publication:
United States
Language:
English

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Cited By (4)

Design-to-Device Approach Affords Panchromatic Co-Sensitized Solar Cells journal December 2018
Rationalizing the suitability of rhodamines as chromophores in dye-sensitized solar cells: a systematic molecular design study journal January 2016
Dye aggregation in dye-sensitized solar cells journal January 2017
Dye aggregation in dye-sensitized solar cells text January 2019


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