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Issue 29, 2014
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N,N′-Bis((6-methoxylpyridin-2-yl)methylene)-p-phenylenediimine based d10 transition metal complexes and their utilization in co-sensitized solar cells

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Abstract

N,N′-Bis((6-methoxylpyridin-2-yl)methylene)-p-phenylenediimine based four-coordinated d10 transition metal complexes (named ML, M = Zn, Cd, Hg) were synthesized and employed as co-sensitizers and co-adsorbents in combination with a ruthenium complex N719 in dye sensitized solar cells. After co-sensitization, not only the incident-photon-to-current conversion efficiency is enhanced but also the dark current is reduced. A short circuit current density of 14.46 mA cm−2, an open circuit voltage of 0.74 V and a fill factor of 0.62 corresponding to an overall conversion efficiency of 6.65% under AM 1.5 G solar irradiation were achieved when ZnL was used as a co-sensitizer, which are much higher than that for DSSCs only sensitized by N719 (5.22%) under the same conditions. The improvement in efficiency is attributed to the fact that N,N′-bis((6-methoxylpyridin-2-yl)methylene)-p-phenylenediimine coordinated complexes overcome the deficiency of N719 absorption in the low wavelength region of the visible spectrum, prevent its aggregation, offset competitive visible light absorption of I3 and reduce charge recombination due to formation of an effective cover layer of the dye molecules on the TiO2 surface. As a result, the synthesized complexes are promising candidates as co-adsorbents and co-sensitizers for highly efficient DSSCs.

Graphical abstract: N,N′-Bis((6-methoxylpyridin-2-yl)methylene)-p-phenylenediimine based d10 transition metal complexes and their utilization in co-sensitized solar cells

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Publication details

The article was received on 11 Feb 2014, accepted on 22 May 2014 and first published on 22 May 2014


Article type: Paper
DOI: 10.1039/C4DT00437J
Citation: Dalton Trans., 2014,43, 11361-11370
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    N,N′-Bis((6-methoxylpyridin-2-yl)methylene)-p-phenylenediimine based d10 transition metal complexes and their utilization in co-sensitized solar cells

    L. Wei, Y. Yang, R. Fan, Y. Na, P. Wang, Y. Dong, B. Yang and W. Cao, Dalton Trans., 2014, 43, 11361
    DOI: 10.1039/C4DT00437J

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