Application of the Tris(acetylacetonato)iron(III)/(II) Redox Couple in p-Type Dye-Sensitized Solar Cells

An electrolyte based on the tris(acetylacetonato)iron(III)/(II) redox couple ([Fe(acac)3]0/1−) was developed for p‐type dye‐sensitized solar cells (DSSCs). Introduction of a NiO blocking layer on the working electrode and the use of chenodeoxycholic acid in the electrolyte enhanced device performanc...

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Published inAngewandte Chemie International Edition Vol. 54; no. 12; pp. 3758 - 3762
Main Authors Perera, Ishanie Rangeeka, Daeneke, Torben, Makuta, Satoshi, Yu, Ze, Tachibana, Yasuhiro, Mishra, Amaresh, Bäuerle, Peter, Ohlin, C. André, Bach, Udo, Spiccia, Leone
Format Journal Article
LanguageEnglish
Published Weinheim WILEY-VCH Verlag 16.03.2015
WILEY‐VCH Verlag
Wiley Subscription Services, Inc
EditionInternational ed. in English
Subjects
Devices
dye-sensitized solar cells
Dyes
Electrodes
Electrolytes
energy conversion
iron
Joining
Photovoltaic cells
Rate constants
redox chemistry
semiconductors
Solar cells
iron
energy conversion
dye-sensitized solar cells
semiconductors
redox chemistry
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Summary:An electrolyte based on the tris(acetylacetonato)iron(III)/(II) redox couple ([Fe(acac)3]0/1−) was developed for p‐type dye‐sensitized solar cells (DSSCs). Introduction of a NiO blocking layer on the working electrode and the use of chenodeoxycholic acid in the electrolyte enhanced device performance by improving the photocurrent. Devices containing [Fe(acac)3]0/1− and a perylene–thiophene–triphenylamine sensitizer (PMI–6T–TPA) have the highest reported short‐circuit current (JSC=7.65 mA cm−2), and energy conversion efficiency (2.51 %) for p‐type DSSCs coupled with a fill factor of 0.51 and an open‐circuit voltage VOC=645 mV. Measurement of the kinetics of dye regeneration by the redox mediator revealed that the process is diffusion limited as the dye‐regeneration rate constant (1.7×108 M−1 s−1) is very close to the maximum theoretical rate constant of 3.3×108 M−1 s−1. Consequently, a very high dye‐regeneration yield (>99 %) could be calculated for these devices. Here comes the sun: The use of an electrolyte based on the tris(acetylacetonato)iron(III)/(II) redox couple (green spheres) in p‐type dye‐sensitized solar cells resulted in rapid dye regeneration and an energy conversion efficiency of 2.51 %. Devices were constructed using a porous NiO layer (brown spheres) on the working electrode sensitized with PMI–6T–TPA, a perylene–thiophene–triphenylamine dye (red spheres).
Bibliography:Australian Solar Institute
Bluescope Steel
Australian Research Council - No. DP110105530; No. DP130100483
Innovia Security
istex:6051B9CC4B9CE6A6E997FE353F314363512F53F0
Monash University
We acknowledge financial support from the Australian Solar Institute, Victorian State Government Department of Primary Industry, Bluescope Steel, Innovia Films, Innovia Security, and Bosch (Victorian Organic Solar Cells consortium), and Monash University (for providing I.R.P. with an International Postgraduate Research Scholarship and an Australian Postgraduate Award). Support of the Australian Centre for Advanced Photovoltaics by the Australian Government through the Australian Renewable Energy Agency (ARENA) is also gratefully acknowledged. C.A.O. thanks the Australian Research Council for Discovery project grants DP110105530 and DP130100483, and a QEII fellowship. The Monash center for electron microscopy is also acknowledged for the SEM facilities. We thank Iacopo Benesperi for calculations of the optimized geometries and molecular radii and Dr. Monika Fekete for the SEM analyses.
Innovia Films
ArticleID:ANIE201409877
Victorian State Government Department of Primary Industry
Australian Renewable Energy Agency (ARENA)
ark:/67375/WNG-R3262W7J-2
Bosch
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.201409877