Influence of 4-tert-butylpyridine in DSCs with CoII/III redox mediator

Teck Ming Koh; Kazuteru Nonomura; Nripan Mathews; Anders Hagfeldt; Michael Grätzel; Subodh G. Mhaisalkar; Andrew C. Grimsdale

doi:10.1021/jp403918q

Influence of 4-tert-butylpyridine in DSCs with Co^II/III redox mediator

Teck Ming Koh, Kazuteru Nonomura, Nripan Mathews, Anders Hagfeldt, Michael Grätzel, Subodh G. Mhaisalkar^*, Andrew C. Grimsdale

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

42 Citations (Scopus)

Abstract

The effect of TBP on Co(II/III) redox electrolyte was examined. Photocurrent of the device can be limited in electrolyte with high TBP concentration due to its viscous nature. The higher amount of TBP in electrolyte increases the viscosity of electrolyte and consequently slows down the diffusion of Co^III species. This is a unique observation for Co(II/III) electrolyte which is not observed in I^-/I₃ ^- electrolyte. An increase in TBP concentration from 0.1 to 0.5 M in a cobalt electrolyte containing 0.1 M Co(bpy)₃(TFSI)₂ and 0.033 M Co(bpy)₃(TFSI)₃ produced a 90 mV improvement in open-circuit potential (V_oc). Using electrochemical impedance spectroscopy (EIS), this enhancement could be attributed to the reduced interfacial recombination (33%) as well as a negative shift in the conduction band level of TiO₂ (67%). Although the influence of TBP in iodide/triiodide and cobalt-complex electrolytes is similar, the increase of viscosity at relatively high concentration of TBP in Co electrolyte should be taken into consideration in order to accomplish high efficiency DSCs based on Co-complex electrolytes.

Original language	English
Pages (from-to)	15515-15522
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	117
Issue number	30
DOIs	https://doi.org/10.1021/jp403918q
Publication status	Published - Aug 1 2013
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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title = "Influence of 4-tert-butylpyridine in DSCs with CoII/III redox mediator",

abstract = "The effect of TBP on Co(II/III) redox electrolyte was examined. Photocurrent of the device can be limited in electrolyte with high TBP concentration due to its viscous nature. The higher amount of TBP in electrolyte increases the viscosity of electrolyte and consequently slows down the diffusion of CoIII species. This is a unique observation for Co(II/III) electrolyte which is not observed in I-/I3 - electrolyte. An increase in TBP concentration from 0.1 to 0.5 M in a cobalt electrolyte containing 0.1 M Co(bpy)3(TFSI)2 and 0.033 M Co(bpy)3(TFSI)3 produced a 90 mV improvement in open-circuit potential (Voc). Using electrochemical impedance spectroscopy (EIS), this enhancement could be attributed to the reduced interfacial recombination (33%) as well as a negative shift in the conduction band level of TiO2 (67%). Although the influence of TBP in iodide/triiodide and cobalt-complex electrolytes is similar, the increase of viscosity at relatively high concentration of TBP in Co electrolyte should be taken into consideration in order to accomplish high efficiency DSCs based on Co-complex electrolytes.",

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AU - Koh, Teck Ming

AU - Nonomura, Kazuteru

AU - Mathews, Nripan

AU - Hagfeldt, Anders

AU - Grätzel, Michael

AU - Mhaisalkar, Subodh G.

AU - Grimsdale, Andrew C.

PY - 2013/8/1

Y1 - 2013/8/1

N2 - The effect of TBP on Co(II/III) redox electrolyte was examined. Photocurrent of the device can be limited in electrolyte with high TBP concentration due to its viscous nature. The higher amount of TBP in electrolyte increases the viscosity of electrolyte and consequently slows down the diffusion of CoIII species. This is a unique observation for Co(II/III) electrolyte which is not observed in I-/I3 - electrolyte. An increase in TBP concentration from 0.1 to 0.5 M in a cobalt electrolyte containing 0.1 M Co(bpy)3(TFSI)2 and 0.033 M Co(bpy)3(TFSI)3 produced a 90 mV improvement in open-circuit potential (Voc). Using electrochemical impedance spectroscopy (EIS), this enhancement could be attributed to the reduced interfacial recombination (33%) as well as a negative shift in the conduction band level of TiO2 (67%). Although the influence of TBP in iodide/triiodide and cobalt-complex electrolytes is similar, the increase of viscosity at relatively high concentration of TBP in Co electrolyte should be taken into consideration in order to accomplish high efficiency DSCs based on Co-complex electrolytes.

AB - The effect of TBP on Co(II/III) redox electrolyte was examined. Photocurrent of the device can be limited in electrolyte with high TBP concentration due to its viscous nature. The higher amount of TBP in electrolyte increases the viscosity of electrolyte and consequently slows down the diffusion of CoIII species. This is a unique observation for Co(II/III) electrolyte which is not observed in I-/I3 - electrolyte. An increase in TBP concentration from 0.1 to 0.5 M in a cobalt electrolyte containing 0.1 M Co(bpy)3(TFSI)2 and 0.033 M Co(bpy)3(TFSI)3 produced a 90 mV improvement in open-circuit potential (Voc). Using electrochemical impedance spectroscopy (EIS), this enhancement could be attributed to the reduced interfacial recombination (33%) as well as a negative shift in the conduction band level of TiO2 (67%). Although the influence of TBP in iodide/triiodide and cobalt-complex electrolytes is similar, the increase of viscosity at relatively high concentration of TBP in Co electrolyte should be taken into consideration in order to accomplish high efficiency DSCs based on Co-complex electrolytes.

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Influence of 4-tert-butylpyridine in DSCs with Co^II/III redox mediator

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