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Oxygen-induced Doping of spiro-MeOTAD in Solid-State Dye-Sensitized Solar Cells and Its Impact on Device Performance

Oxygen-induced Doping of spiro-MeOTAD in Solid-State Dye-Sensitized Solar Cells and Its Impact on Device Performance

Ute B Cappel, Torben Daeneke, Udo Bach

Nano Lett. 2012 Sep 12;12(9):4925-31.

PMID: 22913390

Abstract:

Solid state dye-sensitized solar cells (sDSCs) employing the hole conductor 2,2'7,7'-tetrakis-(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene (spiro-MeOTAD) require the presence of oxygen during fabrication and storage. In this paper, we determine the concentrations of oxidized spiro-MeOTAD within devices under different operating and storage conditions by UV-vis spectroscopy. Relative concentrations of spiro-MeOTAD(+) were found to be greater than 10% after illumination for standard sDSCs, where no chemical dopant had been used in the solar cell fabrication but oxygen and lithium ions were present. We suggest that oxidized spiro-MeOTAD is created as a byproduct of oxygen reduction at the TiO(2) surface during cell illumination. Furthermore, we studied the effect of light soaking under different conditions and associated changes in spiro-MeOTAD(+) concentration on the solar cell measurements. Our findings give insights to photochemical reactions occurring within sDSCs and provide guidelines for which doping levels should be used in device fabrication in absence of oxygen.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP207739728-B	Spiro-MeOTAD		207739-72-8	Price

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