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Excited-State Dynamics of [Ru(bpy)(3)](2+) Thin Films on Sensitized TiO2 and ZrO2
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi, Tillämpad fysikalisk kemi.
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi, Tillämpad fysikalisk kemi.ORCID-id: 0000-0001-5069-3245
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi, Tillämpad fysikalisk kemi.
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi, Tillämpad fysikalisk kemi.ORCID-id: 0000-0002-0387-2993​
Vise andre og tillknytning
2019 (engelsk)Inngår i: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 20, nr 4, s. 618-626Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
Wiley-VCH Verlagsgesellschaft, 2019. Vol. 20, nr 4, s. 618-626
Emneord [en]
Excited-state electron transfer, Ru(bpy)(3), DSSCs, Photochemistry, Solid state
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Identifikatorer
URN: urn:nbn:se:kth:diva-245921DOI: 10.1002/cphc.201801010ISI: 000458952600016PubMedID: 30623544Scopus ID: 2-s2.0-85061237720OAI: oai:DiVA.org:kth-245921DiVA, id: diva2:1295550
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QC 20190312

Tilgjengelig fra: 2019-03-12 Laget: 2019-03-12 Sist oppdatert: 2019-03-12bibliografisk kontrollert

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