Efficient dye-sensitized solar cells based on bioinspired copper redox mediators by tailoring counterionsShow others and affiliations
2022 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, E-ISSN 2050-7496, Vol. 10, no 8, p. 4131-4136Article in journal (Refereed) Published
Abstract [en]
In recent years, copper(ii/i) complexes have attracted growing interest as redox mediators in dye-sensitized solar cells. Here, we report a new class of copper complexes bearing a bis(2-pyridylmethyl)-1,2-ethanedithiol ligand, coded as [Cu(N2S2)]2+/+, with tetrafluoroborate ([BF4]-) and hexafluorophosphate ([PF6]-) counterions. Strikingly, it is discovered that the solubility and diffusion coefficients of Cu(i) species are dramatically improved by changing the counterion from [BF4]- to [PF6]-. As a result, DSCs incorporating the latter redox system show a much enhanced short-circuit current density and fill factor, which in turn lead to a superior overall power conversion efficiency (PCE) of 10.3% under one sun illumination (100 mW cm-2, AM 1.5G). This has been the highest PCE reported so far for copper redox mediators with sulfur-coordinating ligands in DSCs. Thus, this work provides an effective strategy for further design of more efficient redox mediators in DSCs.
Place, publisher, year, edition, pages
Royal Society of Chemistry (RSC) , 2022. Vol. 10, no 8, p. 4131-4136
Keywords [en]
Copper compounds, Ions, Ligands, Redox reactions, Cell-based, Copper complexes, Counterions, Density factor, Dye- sensitized solar cells, Hexafluorophosphates, Redox mediators, Redox systems, Short circuit current density, Tetrafluoroborates, Dye-sensitized solar cells
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-321191DOI: 10.1039/d1ta08207hISI: 000746906500001Scopus ID: 2-s2.0-85125311461OAI: oai:DiVA.org:kth-321191DiVA, id: diva2:1710592
Note
QC 20221114
2022-11-142022-11-142022-11-14Bibliographically approved