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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Correlation Between Charge Recombination and Lateral Hole-Hopping Kinetics in a Series of cis-Ru(phen `)(dcb)(NCS)(2) Dye-Sensitized Solar Cells

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Author(s):
Sampaio, Renato N. [1] ; Mueller, Andressa V. [2] ; Polo, Andre S. [2] ; Meyer, Gerald J. [1]
Total Authors: 4
Affiliation:
[1] Univ North Carolina Chapel Hill, Dept Chem, Chapel Hill, NC 27599 - USA
[2] UFABC, Ctr Ciencias Nat & Humanas, Ave Estados 5001, BR-09210580 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ACS APPLIED MATERIALS & INTERFACES; v. 9, n. 39, p. 33446-33454, OCT 4 2017.
Web of Science Citations: 15
Abstract

Four complexes of the general form cfs-Ru(phen')-(dcb)(NCS)(2) , where deb is 4,4'-(CO2H)(2)-2,2'-bipyridine and phen' is 1,10-phenanthroline (phen), 4,7-(C6H5 )(2)-phen (Ph-2-phen), 4,7-(CH3)(2)-phen (Me-2-phen), or 3,4,7,8-(CH3)(4)-phen (Me-4-phen), were anchored to mesoporous TiO2 thin films for applications as sensitizers in dye-sensitized solar cells (DSSCs). The compounds displayed metal based reductions E circle(Ru-m/u) = 1.01 +/- 0.05 V vs NHE and were potent reductants competent of excited-state electron transfer to TiO2 with yields phi(inj) >= 0.75 in acetonitrile electrolytes. Average charge recombination rate constants, k(cr) , abstracted from nanosecond transient absorption measurements, and the apparent diffusion coefficients for lateral hole-hopping, abstracted from chronabsorptometry measurements, showed the same sensitizer dependency: Ru(Me-4-phen) >Ru(Ph-2-phen) >Ru(Me-2-phen) approximate to Ru(phen). When used in operational solar cells, Ru(Ph-2-phen) was most optimal with an efficiency of (6.6 +/- 0.5)% in ionic liquids under 1 sun illumination. The superior performance of Ru(Ph-2-phen) was traced to a higher injection yield and more efficient regeneration due to an unusually small sensitivity of k(cr) to the number of injected electrons. (AU)

FAPESP's process: 15/00605-5 - Investigation of the formation kinetics of tris-heteroleptic Ru(II) compounds with potential application in energy conversion
Grantee:Andressa Vidal Muller
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 13/25173-5 - Photoreactivity and kinetic formation of ruthenium (II) tris-heteroleptic compounds
Grantee:André Sarto Polo
Support Opportunities: Regular Research Grants