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On the origin of increased open circuit voltage of dye-sensitized solar cells using 4-tert-butyl pyridine as additive to the electrolyte

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3 Author(s)
Durr, M. ; Materials Science Laboratory, Sony Deutschland GmbH, 70327 Stuttgart, Germany ; Yasuda, A. ; Nelles, G.

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A combination of electrical measurements and surface analysis techniques was used to investigate the electronic structure of the TiO2/electrolyte interface and its change upon addition of 4-tert-butyl pyridine to the electrolyte. A reduced interface defect density and a resulting reduction of charge carrier recombination were found to be the main mechanism for an increased open circuit voltage of dye-sensitized solar cells with 4-tert-butyl pyridine in the electrolyte. The reduction of interface defect states was traced back to specific binding of 4-tert-butyl pyridine at defect sites on the TiO2 surface.

Published in:

Applied Physics Letters  (Volume:89 ,  Issue: 6 )

Date of Publication:

Aug 2006

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