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There is a future for N-heterocyclic carbene iron(II) dyes in dye-sensitized solar cells: improving performance through changes in the electrolyte

Karpacheva, Mariia and Wyss, Vanessa and Housecroft, Catherine E. and Constable, Edwin C.. (2019) There is a future for N-heterocyclic carbene iron(II) dyes in dye-sensitized solar cells: improving performance through changes in the electrolyte. Materials, 12 (24). p. 4181.

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Abstract

By systematic tuning of the components of the electrolyte, the performances of dye-sensitized solar cells (DSCs) with an N -heterocyclic carbene iron(II) dye have been significantly improved. The beneficial e ects of an increased Li+ ion concentration in the electrolyte lead to photoconversion e ciencies (PCEs) up to 0.66% for fully masked cells (representing 11.8% relative to 100% set for N719) and an external quantum e ciency maximum (EQEmax ) up to approximately 25% due to an increased short-circuit current density (JSC ). A study of the effects of varying the length of the alkyl chain in 1-alkyl-3-methylimidazolium iodide ionic liquids (ILs) shows that a longer chain results in an increase in JSC with an overall e ciency up to 0.61% (10.9% relative to N719 set at 100%) on going from n -methyl to n -butyl chain, although an n -hexyl chain leads to no further gain in PCE. The results of electrochemical impedance spectroscopy (EIS) support the trends in JSC and open-circuit voltage (VOC ) parameters. A change in the counterion from I- to [BF4 ]- for 1-propyl-3-methylimidazolium iodide ionic liquid leads to DSCs with a remarkably high JSC value for an N -heterocyclic carbene iron(II) dye of 4.90 mA cm-2 , but a low VOC of 244 mV. Our investigations have shown that an increased concentration of Li+ in combination with an optimized alkyl chain length in the 1-alkyl-3-methylimidazolium iodide IL in the electrolyte leads to iron(II)-sensitized DSC performances comparable with those of containing some copper(I)-based dyes
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Constable)
05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Housecroft)
UniBasel Contributors:Housecroft, Catherine Elizabeth and Constable, Edwin Charles and Karpacheva, Mariia and Wyss, Vanessa
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:MDPI
ISSN:1996-1944
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:13 Dec 2019 14:14
Deposited On:13 Dec 2019 14:14

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