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Issue 18, 2019
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A tandem redox system with a cobalt complex and 2-azaadamantane-N-oxyl for fast dye regeneration and open circuit voltages exceeding 1 V

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Abstract

A new tandem electrolyte composed of two redox pairs, the organic radical 2-azaadamantane-N-oxyl (AZ) and the well-known redox pair [Co(bpy)3]3+/2+ was investigated in dye sensitized solar cells. Importantly, an increase in VOC was achieved using the new tandem redox system with values up to 1007 mV, compared to only 896 mV for the reference [Co(bpy)3]3+/2+ couple. Consequently, the tandem electrolytes presented higher device performance in conjunction with the organic dye XY1. It was determined that the VOC improvement is mainly attributed to the combined effect of two factors: the more positive redox potential of the small donor AZ (0.81 V vs. SHE) and improved recombination resistance in the tandem electrolytes.

Graphical abstract: A tandem redox system with a cobalt complex and 2-azaadamantane-N-oxyl for fast dye regeneration and open circuit voltages exceeding 1 V

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Publication details

The article was received on 14 Jan 2019, accepted on 01 Apr 2019 and first published on 02 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA00490D
J. Mater. Chem. A, 2019,7, 10998-11006

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    A tandem redox system with a cobalt complex and 2-azaadamantane-N-oxyl for fast dye regeneration and open circuit voltages exceeding 1 V

    N. Flores-Díaz, H. Bahng, N. Vlachopoulos, Jacques-E. Moser, S. M. Zakeeruddin, M. Grätzel and A. Hagfeldt, J. Mater. Chem. A, 2019, 7, 10998
    DOI: 10.1039/C9TA00490D

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