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Determination of electron and hole energy levels in mesoporous nanocrystalline TiO2 solid-state dye solar cell

Garcia Canadas, Jorge, Fabregat-Santiago, F., Bolink, H. J., Palomares, E., Garcia-Belmonte, G. and Bisquert, J. 2006. Determination of electron and hole energy levels in mesoporous nanocrystalline TiO2 solid-state dye solar cell. Synthetic Metals 156 (14-15) , pp. 944-948. 10.1016/j.synthmet.2006.06.006

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Abstract

A study of a hybrid heterojunction solar cell based on nanocrystalline mesoporous TiO2 and the hole conductor spiro-OMeTAD (2,2′7,7′-tetrakis(N,N′-di-p-methoxyphenyl-amine)-9,9′-spiro-bifluorene) has been realized. Impedance and cyclic voltammetry techniques were used to measure the interfacial properties of the hybrid heterojunction and establish the energy levels of the solid-state electrolyte. It was observed that the energy levels of the organic hole transport material are changed when it forms a film deposited onto indium-doped tin oxide (ITO). Moreover, the HOMO level of the mono oxidized spiro-OMeTAD is well coupled with the HOMO level of the dye N719 (Ru(4,4′-dicarboxy-2,2′-bipyridyI)2(SCN)2) which implies that it is not convenient to increase the doping of the hole conductor much further than this first oxidized state. This doping level (n ≈ 1019 cm−3) also assures a high enough hole conductivity. The implications of our results to the solid-state dye solar cell performance are discussed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: Hole-transporting material; TiO2; Dye sensitized solar cell; Doping; Energy level
Publisher: Elsevier
ISSN: 0379-6779
Last Modified: 19 Mar 2016 23:21
URI: http://orca.cf.ac.uk/id/eprint/48416

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