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Oxygen-induced doping of spiro-MeOTAD in solid-state dye-sensitized solar cells and its impact on device performance.
2012 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 12, no 9, p. 4925-31Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2012. Vol. 12, no 9, p. 4925-31
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-225445DOI: 10.1021/nl302509qISI: 000308576000084PubMedID: 22913390Scopus ID: 2-s2.0-84866342593OAI: oai:DiVA.org:kth-225445DiVA, id: diva2:1195410
Note

QC 20180416

Available from: 2018-04-05 Created: 2018-04-05 Last updated: 2018-04-16Bibliographically approved

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