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The influence of phosphonic acid protonation state on the efficiency of bis(diimine)copper(I) dye-sensitized solar cells

Stephens, Alexander J. and Malzner, Frederik J. and Constable, Edwin C. and Housecroft, Catherine E.. (2018) The influence of phosphonic acid protonation state on the efficiency of bis(diimine)copper(I) dye-sensitized solar cells. Sustainable Energy & Fuels, 2. pp. 786-794.

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Abstract

We present an investigation of the effects of a change in the protonation state of the phosphonic acid anchoring ligand in the dye [Cu(H 4 1 )( 2 )][PF 6 ] (H 4 1 = ((6,6'-dimethyl-[2,2'-bipyridine]-4,4'-diyl)bis(4,1-phenylene))bis(phosphonic acid), 2 = 4,4'-bis(4-bromophenyl)-6,6'-dimethyl-2,2'-bipyridine) on the performance of n-type dye-sensitized solar cells (DSCs). FTO/TiO 2 electrodes were immersed in solutions of H 4 1 in the presence of base (0–4 equivalents). TiO 2 -anchored heteroleptic copper(I) sensitizers were subsequently formed by ligand exchange between the homoleptic complex [Cu( 2 ) 2 ][PF 6 ] and the anchored ligand [H 4– n 1 ] n – . The results demonstrate that the addition of one equivalent of base during the initial surface functionalization can afford up to a 26% increase in DSC efficiency, while the addition of ≥3 equivalents of base significantly hinders DSC performance. Deprotonation of H 4 1 has been investigated using 1 H and 31 P NMR spectroscopic titrations. Further insight into DSC performance has been gained by using electrochemical impedance spectroscopy, and a comparison is made between DSCs in which the working electrodes are either pre-treated with a base, or exposed to a base post heteroleptic copper(I) dye-assembly.
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 Malzner, Frederik Jürgen and Constable, Edwin Charles and Stephens, Alexander
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Royal Society of Chemistry
e-ISSN:2398-4902
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:06 Apr 2018 11:27
Deposited On:06 Apr 2018 11:27

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