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Excited-State Dynamics of [Ru(bpy) 3 ] 2+ Thin Films on Sensitized TiO 2 and ZrO 2

Excited-State Dynamics of [Ru(bpy) 3 ] 2+ Thin Films on Sensitized TiO 2 and ZrO 2

Valentina Leandri, Peng Liu, Azar Sadollahkhani, Majid Safdari, Lars Kloo, James M Gardner

Chemphyschem. 2019 Feb 18;20(4):618-626.

PMID: 30623544

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP60804742	Tris(2,2′-bipyridine)ruthenium(II) hexafluorophosphate		60804-74-2	Price

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