| Over the last years, as a novel renewable energy conversion system, the use of solar cells is gradually moving into high gear. Currently, dye-sensitized solar cells (DSSCs) as the most promising alternatives for the photovoltaic conversion of solar energy have attracted much interesting attention due to their high efficiency, potential low-cost and so forth.Ru complexes as dyes are widely used in DSSCs, due to the advantages of broad absorption spectrum and good electrochemical stability. However, the rarity and high cost of the ruthenium metal may limit their development for large-scale applications. Polymeric metal complex have good thermal stability, and their energy gap and transmission of electron also can be controled by coordination bond and d-πbond. Comprise with complexes, polymeric metal complexes display unique electrical, optical, magnetic propertie, generating a new and versatile class of functional materials. In this study, a series of donor-π-acceptor (D-π-A) type polymeric metal complexes containing Cd(Ⅱ), Co(II) or Ni(Ⅱ) complexes were synthesized and characterized by GPC, FT-IR,1H NMR, TGA, TMA, UV-vis, PL, CV and the application in dye-sensitized solar cells (DSSCs) as dye sensitizers are also determined and studied. The main work summarized as follows:1. Three novel D-π-A type main chain polymeric metal complexes based on Polystyrene or Polyfluorenevinyl containing complexes of thienyl-(8-hydroxyquinoline) with Cd(Ⅱ) have been synthesized by Heck coupling and utilized as dyes for dye-sensitized solar cells (DSSCs). It was found that the longer alkyl chains may improve the solubility of polymeric metal complex. In addition, the solar irradiation conversion efficiency of B8QMEHP-Cd(Ⅱ) were higher than B8QF-Cd(Ⅱ)(1.48%) and B8QP-Cd(II)(1.57%), mainly resulting from the methoxy group may improve the short-circuit photocurrent.2. A series donor-π-acceptor type polymeric metal complexes PCo-F, PCo-B, PNi-F and PNi-B consist of the Co (Ⅱ) or Ni (Ⅱ) complexes as an acceptor (A), C=C as aπ-conjugation linkage, and thiophene-fluorene or phenylene as a donor group (D). The DSSCs fabricated by branched chain polymeric metal complexes with power conversion efficiency up to 0.96%, 1.01%,1.00% and 1.21%, respectively, under simulated AM 1.5G solar irradiation (100 mW/cm2). The result showed that polymeric metal complexes with Co(II), Ni(Ⅱ) complexes in the side chain exhibited good solubility and have similar energy conversion efficiency, indicating a possibility to use common metal instead of rare earth metals. |
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