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Complexity of Electron Injection Dynamics and Light Soaking Effects in Efficient Dyes for Modern DSSC

Author

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  • Adam Glinka

    (Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland)

  • Jacek Kubicki

    (Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland)

  • Marcin Ziółek

    (Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland)

Abstract

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) 3 ](B(CN) 4 ) 2/3 (bpy = 2,2′-bipyridine) or [Cu(tmby) 2 ](TFSI) 1/2 (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.

Suggested Citation

  • Adam Glinka & Jacek Kubicki & Marcin Ziółek, 2021. "Complexity of Electron Injection Dynamics and Light Soaking Effects in Efficient Dyes for Modern DSSC," Energies, MDPI, vol. 14(2), pages 1-15, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:2:p:407-:d:479402
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    References listed on IDEAS

    as
    1. Jun-ichi Fujisawa, 2020. "Interfacial Charge-Transfer Transitions for Direct Charge-Separation Photovoltaics," Energies, MDPI, vol. 13(10), pages 1-14, May.
    2. Yiming Cao & Yasemin Saygili & Amita Ummadisingu & Joël Teuscher & Jingshan Luo & Norman Pellet & Fabrizio Giordano & Shaik Mohammed Zakeeruddin & Jacques -E. Moser & Marina Freitag & Anders Hagfeldt , 2017. "11% efficiency solid-state dye-sensitized solar cells with copper(II/I) hole transport materials," Nature Communications, Nature, vol. 8(1), pages 1-8, August.
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