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Application of the Tris(acetylacetonato)iron(III)/(II) Redox Couple in p‐Type Dye‐Sensitized Solar Cells
Author(s) -
Perera Ishanie Rangeeka,
Daeneke Torben,
Makuta Satoshi,
Yu Ze,
Tachibana Yasuhiro,
Mishra Amaresh,
Bäuerle Peter,
Ohlin C. André,
Bach Udo,
Spiccia Leone
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201409877
Subject(s) - chemistry , redox , dye sensitized solar cell , photocurrent , electrolyte , triphenylamine , tris , reaction rate constant , photochemistry , open circuit voltage , inorganic chemistry , analytical chemistry (journal) , electrode , materials science , kinetics , organic chemistry , optoelectronics , biochemistry , physics , quantum mechanics , voltage
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 ( J SC =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 V OC =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 (1.7×10 8 M −1 s −1 ) is very close to the maximum theoretical rate constant of 3.3×10 8 M −1 s −1 . Consequently, a very high dye‐regeneration yield (>99 %) could be calculated for these devices.