title: N,N'-Bis((6-methoxylpyridin-2-yl)methylene)-p-phenylenediimine based d(10) transition metal complexes and their utilization in co-sensitized solar cells.
abstract: N,N'-Bis((6-methoxylpyridin-2-yl)methylene)-p-phenylenediimine based four-coordinated d(10) 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.
authors.affiliation: Department of Chemistry, Harbin Institute of Technology, Harbin 150001, P. R. China. ylyang@hit.edu.cn fanruiqing@hit.edu.cn.
authors.forename: Liguo
authors.initials: L
authors.lastname: Wei
authors.forename: Yulin
authors.initials: Y
authors.lastname: Yang
authors.forename: Ruiqing
authors.initials: R
authors.lastname: Fan
authors.forename: Yong
authors.initials: Y
authors.lastname: Na
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.forename: Yuwei
authors.initials: Y
authors.lastname: Dong
authors.forename: Bin
authors.initials: B
authors.lastname: Yang
authors.forename: Wenwu
authors.initials: W
authors.lastname: Cao