Complexity of Electron Injection Dynamics and Light Soaking Effects in Efficient Dyes for Modern DSSC
Electron transfer dynamics in dye sensitized solar cells (DSSCs) employing triphenylamine Y123 dye were investigated by means of femtosecond broadband transient absorption spectroscopy in the visible and mid-IR range of detection. The electron injection process to the titania conduction band was fou...
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| Format: | Article |
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MDPI AG
2021-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/2/407 |
| _version_ | 1797412257987035136 |
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| author | Adam Glinka Jacek Kubicki Marcin Ziółek |
| author_facet | Adam Glinka Jacek Kubicki Marcin Ziółek |
| author_sort | Adam Glinka |
| collection | DOAJ |
| description | Electron transfer dynamics in dye sensitized solar cells (DSSCs) employing triphenylamine Y123 dye were investigated by means of femtosecond broadband transient absorption spectroscopy in the visible and mid-IR range of detection. The electron injection process to the titania conduction band was found to appear biphasically with the time constant of the first component within 350 fs and that of the second component between 80 and 95 ps. Subsequently, the effects of continuous irradiation on the ultrafast and fast electron transfer processes were studied in the systems comprising Y123 dye or carbazole MK2 dye in combination with cobalt- or copper-based redox mediators: [Co(bpy)<sub>3</sub>](B(CN)<sub>4</sub>)<sub>2/3</sub> (bpy = 2,2′-bipyridine) or [Cu(tmby)<sub>2</sub>](TFSI)<sub>1/2</sub> (tmby = 4,4′,6,6′ tetramethyl-2,2′-bipyridine, TFSI = bis(trifluoromethane)sulfonamide). We have found that the steady-state illumination led to acceleration of the electron injection process due to the lowering of titania conduction band edge energy. Moreover, we have observed that the back electron transfer to the oxidized dye was suppressed. These changes in the initial (up to 3 ns) charge separation efficiency were directly correlated with the photocurrent enhancement. |
| first_indexed | 2024-03-09T05:00:24Z |
| format | Article |
| id | doaj.art-b6e269acaf914735ba4383c0d9db9737 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T05:00:24Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
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| series | Energies |
| spelling | doaj.art-b6e269acaf914735ba4383c0d9db97372023-12-03T13:01:30ZengMDPI AGEnergies1996-10732021-01-0114240710.3390/en14020407Complexity of Electron Injection Dynamics and Light Soaking Effects in Efficient Dyes for Modern DSSCAdam Glinka0Jacek Kubicki1Marcin Ziółek2Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 2, 61-614 Poznań, PolandQuantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 2, 61-614 Poznań, PolandQuantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 2, 61-614 Poznań, PolandElectron transfer dynamics in dye sensitized solar cells (DSSCs) employing triphenylamine Y123 dye were investigated by means of femtosecond broadband transient absorption spectroscopy in the visible and mid-IR range of detection. The electron injection process to the titania conduction band was found to appear biphasically with the time constant of the first component within 350 fs and that of the second component between 80 and 95 ps. Subsequently, the effects of continuous irradiation on the ultrafast and fast electron transfer processes were studied in the systems comprising Y123 dye or carbazole MK2 dye in combination with cobalt- or copper-based redox mediators: [Co(bpy)<sub>3</sub>](B(CN)<sub>4</sub>)<sub>2/3</sub> (bpy = 2,2′-bipyridine) or [Cu(tmby)<sub>2</sub>](TFSI)<sub>1/2</sub> (tmby = 4,4′,6,6′ tetramethyl-2,2′-bipyridine, TFSI = bis(trifluoromethane)sulfonamide). We have found that the steady-state illumination led to acceleration of the electron injection process due to the lowering of titania conduction band edge energy. Moreover, we have observed that the back electron transfer to the oxidized dye was suppressed. These changes in the initial (up to 3 ns) charge separation efficiency were directly correlated with the photocurrent enhancement.https://www.mdpi.com/1996-1073/14/2/407dye sensitized solar cellelectron injectionlight soakingtriphenlylamine dyecarbazole dyecobalt complex |
| spellingShingle | Adam Glinka Jacek Kubicki Marcin Ziółek Complexity of Electron Injection Dynamics and Light Soaking Effects in Efficient Dyes for Modern DSSC Energies dye sensitized solar cell electron injection light soaking triphenlylamine dye carbazole dye cobalt complex |
| title | Complexity of Electron Injection Dynamics and Light Soaking Effects in Efficient Dyes for Modern DSSC |
| title_full | Complexity of Electron Injection Dynamics and Light Soaking Effects in Efficient Dyes for Modern DSSC |
| title_fullStr | Complexity of Electron Injection Dynamics and Light Soaking Effects in Efficient Dyes for Modern DSSC |
| title_full_unstemmed | Complexity of Electron Injection Dynamics and Light Soaking Effects in Efficient Dyes for Modern DSSC |
| title_short | Complexity of Electron Injection Dynamics and Light Soaking Effects in Efficient Dyes for Modern DSSC |
| title_sort | complexity of electron injection dynamics and light soaking effects in efficient dyes for modern dssc |
| topic | dye sensitized solar cell electron injection light soaking triphenlylamine dye carbazole dye cobalt complex |
| url | https://www.mdpi.com/1996-1073/14/2/407 |
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