Synthesis And Study On The Photovoltaic Properties Of New Polymeric Metal Complexes

Dye-sensitized solar cells (DSSCs) have become one of the most promising renewableand clean energy sources with the potential to be an alternative of fossil energy. Thedye-sensitizer (dye) which bears the most important function of absorbing sunlight to generateand transfer electrons is the most crucial component in affecting the photovoltaic performanceof dye-sensitized solar cells. It has great theoretical and practical significance to synthesize anew dye with high photovoltaic performance, low-cost and high stability. The subject of thisthesis is different from the existed ruthenium metal complex dyes, metal porphyrin and phthalocyaninedyes as well as the organic dyes, we are aim to design and synthesize new polymeric metal complexesdyes that integrate inorganic, organic and macromolecule components into a whole. We have synthesizeda series of new polymeric metal complexes dyes with excellent light absorption performance, high carriertransfer properties, high stability and low cost, the influences of their composition and structure on thephotovoltaic performances were investigated, and the preparation methods and applications of these newexcellent synthesized dyes were explored,.The details are as follows:(1) A series of D-A and D-π-A type polymeric metal complexes dyes N1-N12have been designedand synthesized by used zinc (II) or copper (II) phenanthroline metal complexes as the acceptor (A),p-phenylenevinylene, carbazole or fluorene derivatives as the donor (D), thienyl vinyl as π bridge, and theirphotovoltaic performances were characterized and analyzed. The results show that: a, D-π-A typepolymeric metal complexes N7-N12exhibit higher photo-electron power conversion efficiency(PCE) thancorresponding D-A type N1-N6(PCE above1.0-2.5%); b, copper (II) polymeric complexes exhibit higherphoto-electron power conversion efficiency than zinc (II) polymeric complexes (PCE above0.2-0.5%); c,polymeric metal complexes with fluorene derivatives as donor exhibit higher photo-electron powerconversion efficiency than corresponding polymeric metal complexes with p-phenylenevinylene andcarbazole derivatives as donor (PCE above0.2-0.6%); d, In N1-N12, D-π-A type copper (II) polymericcomplexes N10exhibit the highest photo-electron power conversion efficiency,up to3.18%.(2) A series of D-π-A type polymeric metal complexes dyes Q1-Q10have been designed andsynthesized by used zinc (II) or copper (II)8-hydroxyquinoline metal complexes as the acceptor (A),p-phenylenevinylene, carbazole or fluorene derivatives, or a mixed derivative connected by them as thedonor (D), a vinyl group or thienyl vinyl as π bridge, and their photovoltaic performances werecharacterized and analyzed, the result show that: a, polymeric metal complexes dyes Q7-Q10with mixedconnection derivatives as donor (D) which show excellent electron-donating ability exhibit higherphoto-electron power conversion efficiency than the polymeric metal complexes dyes Q1~Q6with onlyp-phenylenevinylene, carbazole or fluorene derivatives as donor (PCE above1.0-2.5%); b, copper (II) polymeric metal complexes exhibit higher photo-electron power conversion efficiency than zinc (II)polymeric metal complexes (PCE above0.2-0.6%); c, copper (II) polymeric complexes Q10exhibit thehighest photo-electron power conversion efficiency,up to3.78%.The results showed that the two series of polymeric metal complexes dyes have excellentphotovoltaic performance and high thermal stability; these give us a new important direction of dyesensitizers’development.