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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 |
| Institution: | 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 |