Synthesis And Study On Photovoltaic Properties Of Novel Dyes Of Polymeric Metal Complexes Containing Aldehyde Derivatives

As a renewable energy, solar energy is clean, pollution-free and rich reserves, it’s valuable to be greatly developed. To convert solar energy directly into electrical energy is an attractive method to solve the energy problem. Dye sensitized solar cell has the advantage of relatively low production cost, since the invention, its energy conversion efficiency is improving, indicating its promising prospects. Dye sensitizer plays the core role in dye sensitized solar cell, the performance of dye sensitizer greatly influenced the device. Ruthenium complex is a kind of efficient dyes and have been widely studied. But the high cost of ruthenium and the limited source restrict their development. Adopting common transition metals with low cost as alternatives for ruthenium has the development potential. This paper studies two series dyes of polymeric metal complexes, which combine the advantages of inorganic and organic materials, they show good thermal stability and unique photoelectrochemical performance, the contents are as follows:(1) A series of polymeric metal complexes dyes with electronic push-pull type structure have been synthesized through yamamoto reaction, which used metal complexes of salicylaldehyde derivatives as electron acceptors, benzodithiophene or carbazole derivatives as donors. The synthesized polymeric metal complexes have been characterized and analyzed by some test, and their relevant optical, electrochemical and photovoltaic properties were investigated. Results show that these polymeric metal complexes can meet the requirement in thermal stability for their application of dyes, and P1-P4 exhibited some energy conversion efficiency of 2.24%, 2.43%, 1.84% and 2.24% respectively, among them, the polymeric metal complexes dyes containing benzodithiophene derivatives as donors(P1, P2) exhibited higher efficiency than that with carbazole derivatives(P3, P4).(2) A series dyes of side chain polymeric metal complexes have been synthesized by yamamoto reaction, which used metal complexes of benzaldehyde derivatives as electron acceptors with the coordinated metal ions of Zn(II) or Cd(II), benzodithiophene or carbazole derivatives were used as donors. The relevant optical, electrochemical and photovoltaic properties of the synthesized polymeric metal complexes have been investigated. Results show that these polymeric metal complexes(P1-P4) have good thermal stability, and showed a certain energy conversion efficiency of 1.93%, 1.41%, 2.18%, 1.63%, respectively. The polymeric metal complexes dyes with Cd(II) complexes exhibited higher energy conversion efficiency than that with Zn(II).The two series dyes of polymeric metal complexes in this paper show good thermal stability and exhibit some photovoltaic performance. It suggests that this kind of polymeric metal complexes has great potential to be used as dye sensitizers, the work of this paper points out a direction for further improving the performance of this kind of dyes, and provides a new path to the design novel dye sensitizers.