title: Application of the tris(acetylacetonato)iron(III)/(II) redox couple in p-type dye-sensitized solar cells.
abstract: 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.
authors: School of Chemistry, Monash University, Victoria 3800 (Australia).
authors: Ishanie Rangeeka
authors: IR
authors: Perera
authors: Torben
authors: T
authors: Daeneke
authors: Satoshi
authors: S
authors: Makuta
authors: Ze
authors: Z
authors: Yu
authors: Yasuhiro
authors: Y
authors: Tachibana
authors: Amaresh
authors: A
authors: Mishra
authors: Peter
authors: P
authors: Bäuerle
authors: C André
authors: CA
authors: Ohlin
authors: Udo
authors: U
authors: Bach
authors: Leone
authors: L
authors: Spiccia
keywords: dye-sensitized solar cells; energy conversion; iron; redox chemistry; semiconductors