Jump to main content
Jump to site search

Issue 26, 2017
Previous Article Next Article

The way to panchromatic copper(I)-based dye-sensitized solar cells: co-sensitization with the organic dye SQ2

Author affiliations

Abstract

We report the first example of n-type dye-sensitized solar cells (DSCs) co-sensitized with a copper(I)-based sensitizer and an organic dye. The heteroleptic copper(I) dye [Cu(3)(1)]+ (3 = anchoring ligand ((6,6′-dimethyl-[2,2′-bipyridine]-4,4′-diyl)bis(4,1-phenylene))bis(phosphonic acid), 1 = ancillary ligand 2-(6-methylpyridin-2-yl)thiazole) was combined with the commercially available squaraine derivative SQ2. By prudent matching of the external quantum efficiency (EQE) maxima arising from the two dyes in complementary parts of the visible spectrum, we have achieved the highest photoconversion efficiency reported for a copper-based DSC (65.6% relative to N719 set at 100%). This confirms the potential for the use of Earth-sustainable copper as the basis of sensitizers in DSCs. A combination of JV measurements (J = current density, V = voltage), EQE spectra and electrochemical impedance spectroscopy has been used to optimize and understand the effective use of the co-sensitized DSCs. We have shown that the sequences in which the photoanodes of the n-type DSCs are exposed to [Cu(3)(1)]+ and SQ2, and the times that the electrodes are immersed in the respective dye baths, critically influence the overall performance of the DSCs. A degree of aggregation of the SQ2 molecules on the electrode surface is important in terms of achieving panchromatic light-harvesting of the co-sensitized DSCs, but excessive aggregation is detrimental.

Graphical abstract: The way to panchromatic copper(i)-based dye-sensitized solar cells: co-sensitization with the organic dye SQ2

Back to tab navigation

Supplementary files

Publication details

The article was received on 23 Mar 2017, accepted on 12 Jun 2017 and first published on 12 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA02575K
Citation: J. Mater. Chem. A, 2017,5, 13717-13729
  •   Request permissions

    The way to panchromatic copper(I)-based dye-sensitized solar cells: co-sensitization with the organic dye SQ2

    F. J. Malzner, M. Willgert, E. C. Constable and C. E. Housecroft, J. Mater. Chem. A, 2017, 5, 13717
    DOI: 10.1039/C7TA02575K

Search articles by author

Spotlight

Advertisements