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Excited-State Dynam...
Excited-State Dynamics of [Ru(bpy)(3)](2+) Thin Films on Sensitized TiO2 and ZrO2
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- Leandri, Valentina (author)
- KTH,Tillämpad fysikalisk kemi
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- Liu, Peng (author)
- KTH,Tillämpad fysikalisk kemi
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- Sadollahkhani, Azar (author)
- KTH,Tillämpad fysikalisk kemi
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- Safdari, Majid (author)
- KTH,Tillämpad fysikalisk kemi
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- Kloo, Lars (author)
- KTH,Tillämpad fysikalisk kemi
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- Gardner, James M., 1982- (author)
- KTH,Tillämpad fysikalisk kemi
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(creator_code:org_t)
- 2019-02-07
- 2019
- English.
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In: ChemPhysChem. - : Wiley-VCH Verlagsgesellschaft. - 1439-4235 .- 1439-7641. ; 20:4, s. 618-626
- Related links:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The excited state dynamics of Tris(2,2 '-bipyridine)ruthenium(II) hexafluorophosphate, [Ru(bpy)(3)(PF6)(2)], was investigated on the surface of bare and sensitized TiO2 and ZrO2 films. The organic dyes LEG4 and MKA253 were selected as sensitizers. A Stern-Volmer plot of LEG4-sensitized TiO2 substrates with a spin-coated [Ru(bpy)(3)(PF6)(2)] layer on top shows considerable quenching of the emission of the latter. Interestingly, time-resolved emission spectroscopy reveals the presence of a fast-decay time component (25 +/- 5 ns), which is absent when the anatase TiO2 semiconductor is replaced by ZrO2. It should be specified that the positive redox potential of the ruthenium complex prevents electron transfer from the [Ru(bpy)(3)(PF6)(2)] ground state into the oxidized sensitizer. Therefore, we speculate that the fast-decay time component observed stems from excited-state electron transfer from [Ru(bpy)(3)(PF6)(2)] to the oxidized sensitizer. Solid-state dye sensitized solar cells (ssDSSCs) employing MKA253 and LEG4 dyes, with [Ru(bpy)(3)(PF6)(2)] as a hole-transporting material (HTM), exhibit 1.2 % and 1.1 % power conversion efficiency, respectively. This result illustrates the possibility of the hypothesized excited-state electron transfer.
Subject headings
- NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
Keyword
- Excited-state electron transfer
- Ru(bpy)(3)
- DSSCs
- Photochemistry
- Solid state
Publication and Content Type
- ref (subject category)
- art (subject category)
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