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Electrolytes Based on TEMPO–Co Tandem Redox Systems Outperform Single Redox Systems in Dye‐sensitized Solar Cells

A new TEMPO–Co tandem redox system with TEMPO and Co(bpy)(3) (2+/3+) has been investigated for the use in dye‐sensitized solar cells (DSSCs). A large open‐circuit voltage (V (OC)) increase, from 862 mV to 965 mV, was observed in the tandem redox system, while the short‐circuit current density (J (SC...

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Detalles Bibliográficos
Autores principales: Cong, Jiayan, Hao, Yan, Boschloo, Gerrit, Kloo, Lars
Formato: Online Artículo Texto
Lenguaje:English
Publicado: WILEY‐VCH Verlag 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4819522/
https://www.ncbi.nlm.nih.gov/pubmed/25504818
http://dx.doi.org/10.1002/cssc.201402780
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author Cong, Jiayan
Hao, Yan
Boschloo, Gerrit
Kloo, Lars
author_facet Cong, Jiayan
Hao, Yan
Boschloo, Gerrit
Kloo, Lars
author_sort Cong, Jiayan
collection PubMed
description A new TEMPO–Co tandem redox system with TEMPO and Co(bpy)(3) (2+/3+) has been investigated for the use in dye‐sensitized solar cells (DSSCs). A large open‐circuit voltage (V (OC)) increase, from 862 mV to 965 mV, was observed in the tandem redox system, while the short‐circuit current density (J (SC)) was maintained. The conversion efficiency was observed to increase from 7.1 % for cells containing the single Co(bpy)(3) (2+/3+) redox couple, to 8.4 % for cells containing the TEMPO–Co tandem redox system. The reason for the increase in V (OC) and overall efficiency is ascribed to the involvement of partial regeneration of the sensitizing dye molecules by TEMPO. This assumption can be verified through the observed much faster regeneration dynamics exhibited in the presence of the tandem system. Using the tandem redox system, the faster recombination problem of the single TEMPO redox couple is resolved and the mass‐transport of the metal‐complex‐based electrolyte is also improved. This TEMPO–Co tandem system is so far the most effienct tandem redox electrolyte reported not involving iodine. The current results show a promising future for tandem system as replacements for single redox systems in electrolytes for DSSCs.
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spelling pubmed-48195222016-04-28 Electrolytes Based on TEMPO–Co Tandem Redox Systems Outperform Single Redox Systems in Dye‐sensitized Solar Cells Cong, Jiayan Hao, Yan Boschloo, Gerrit Kloo, Lars ChemSusChem Communications A new TEMPO–Co tandem redox system with TEMPO and Co(bpy)(3) (2+/3+) has been investigated for the use in dye‐sensitized solar cells (DSSCs). A large open‐circuit voltage (V (OC)) increase, from 862 mV to 965 mV, was observed in the tandem redox system, while the short‐circuit current density (J (SC)) was maintained. The conversion efficiency was observed to increase from 7.1 % for cells containing the single Co(bpy)(3) (2+/3+) redox couple, to 8.4 % for cells containing the TEMPO–Co tandem redox system. The reason for the increase in V (OC) and overall efficiency is ascribed to the involvement of partial regeneration of the sensitizing dye molecules by TEMPO. This assumption can be verified through the observed much faster regeneration dynamics exhibited in the presence of the tandem system. Using the tandem redox system, the faster recombination problem of the single TEMPO redox couple is resolved and the mass‐transport of the metal‐complex‐based electrolyte is also improved. This TEMPO–Co tandem system is so far the most effienct tandem redox electrolyte reported not involving iodine. The current results show a promising future for tandem system as replacements for single redox systems in electrolytes for DSSCs. WILEY‐VCH Verlag 2014-12-10 2015-01 /pmc/articles/PMC4819522/ /pubmed/25504818 http://dx.doi.org/10.1002/cssc.201402780 Text en © 2016 The Authors. Published by Wiley‐VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution Non‐Commercial NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made. Open access.
spellingShingle Communications
Cong, Jiayan
Hao, Yan
Boschloo, Gerrit
Kloo, Lars
Electrolytes Based on TEMPO–Co Tandem Redox Systems Outperform Single Redox Systems in Dye‐sensitized Solar Cells
title Electrolytes Based on TEMPO–Co Tandem Redox Systems Outperform Single Redox Systems in Dye‐sensitized Solar Cells
title_full Electrolytes Based on TEMPO–Co Tandem Redox Systems Outperform Single Redox Systems in Dye‐sensitized Solar Cells
title_fullStr Electrolytes Based on TEMPO–Co Tandem Redox Systems Outperform Single Redox Systems in Dye‐sensitized Solar Cells
title_full_unstemmed Electrolytes Based on TEMPO–Co Tandem Redox Systems Outperform Single Redox Systems in Dye‐sensitized Solar Cells
title_short Electrolytes Based on TEMPO–Co Tandem Redox Systems Outperform Single Redox Systems in Dye‐sensitized Solar Cells
title_sort electrolytes based on tempo–co tandem redox systems outperform single redox systems in dye‐sensitized solar cells
topic Communications
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4819522/
https://www.ncbi.nlm.nih.gov/pubmed/25504818
http://dx.doi.org/10.1002/cssc.201402780
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AT haoyan electrolytesbasedontempocotandemredoxsystemsoutperformsingleredoxsystemsindyesensitizedsolarcells
AT boschloogerrit electrolytesbasedontempocotandemredoxsystemsoutperformsingleredoxsystemsindyesensitizedsolarcells
AT kloolars electrolytesbasedontempocotandemredoxsystemsoutperformsingleredoxsystemsindyesensitizedsolarcells