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Application of the Tris(acetylacetonato)iron(III)/(II) Redox Couple in p‐Type Dye‐Sensitized Solar Cells |
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| Authors: | Ishanie Rangeeka Perera Dr. Torben Daeneke Satoshi Makuta Dr. Ze Yu Prof. Dr. Yasuhiro Tachibana Dr. Amaresh Mishra Prof. Dr. Peter Bäuerle Dr. C. André Ohlin Prof. Dr. Udo Bach Prof. Dr. Leone Spiccia |
| Affiliation: | 1. School of Chemistry, Monash University, Victoria 3800 (Australia);2. CSIRO Materials Science and Engineering, CSIRO Future Manufacturing Flagship, Bag 10, Clayton South 3169 Victoria (Australia);3. School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Bundoora, Victoria 3083 (Australia);4. Department of Materials Engineering, Faculty of Engineering, Monash University, Victoria 3800 (Australia);5. Japan Science and Technology Agency (JST), PRESTO, 4‐1‐8 Honcho Kawaguchi, Saitama 332‐0012 (Japan);6. Institute for Organic Chemistry II and Advanced Materials, University of Ulm, Albert‐Einstein‐Allee 11, 89081 Ulm (Germany);7. Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton 3168 Victoria (Australia) |
| 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 (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. |
| Keywords: | dye‐sensitized solar cells energy conversion iron redox chemistry semiconductors |