Design, Synthesis And Study On Photovoltaic Properties Of The Novel D-Ï€-A Type Side Chain Polymeric Metal Complexes Dye Molecules

In recent years, more and more people began to focus on energy issues. The solar energy isrecognized as clean energy, thus the energy issues must be effectively solved by thewidespread use of solar cells. Since1991the dye-sensitized solar cell (DSSC) was firstreported, it attracted much attention and in comparison with conventional semiconductor solarcells, it has lower cost, less environmental pollution, more widespread sources of rawmaterials, etc, which makes it has the potential to be more widely used. As the keycomponents of the sensitizer dye-sensitized solar cells, dye sensitized has been researched alot, therefore, a new and efficient dye D-π-A structure is proposed, with an organic group aselectron donor and acceptor, and other organic groups as π bridge structure this structure has agood electron transport properties and by molecular structure designing to adjust the energylevel of the dye molecules then obtain a high efficiency of dye molecules.During the research process of the organic dye, it is found that triphenylamine andcarbazole have excellent hole transport properties and preferably electron-donating ability,which make them a good donor material, therefore, they have been extensively researched inthe photoelectric and light emitting field. In addition, triphenylamine and carbazole havecertain advantages such as good stability, relatively lower price and easier access to thematerial and easier modification in its structure, thus they receive a lot of attention and beapplied widely in the field of organic solar cells in recent years.Being the key component of DSSC and acts as an important role, dye sensitizer and itssynthesis and application has been extensively researched. In this paper, two series of eightnovel D-π-A structure polymeric metal complexes were functionally designed, synthesizedand characterized by IR,1H NMR, Gel permeation chromatography (GPC), Elementalanalysis and so on. Their UV-visible absorption properties, thermal stability, electrochemicalproperties, photovoltaic performance and so on in DSSC were also investigated. The studyfound that these polymeric metal complexes as dye satisfy the basic requirements, but theenergy conversion efficiency is not particularly desirable. The first series of P1~P4dyes, thehighest efficiency (η) P4is only1.09%, while the second series of PAL1, PAL2, PBL1, PBL2dyes, the highest η PBL1is only1.76%too, however, these dyes have good thermal stabilityand good electron transport capability. The efficient of the polymerized metal complex dyes inour study was far from the desired results of our expectation, a new path for the synthesis andstudy of the dye sensitizer was provided.