A Ru-complex for solar cell

To obtain a photosensitizer for photovoltaic application,a Ru-complex(Ru-[bpy(COOEt)2]2Cl2),was synthesized and characterized by 1HNMR,MS,FT-IR,UV-Vis and element analysis.Ru-[bpy(COOEt)2]2Cl2 in DMF exhibited strong absorptions in the region of 350-800 nm and its energy levels for the highest occupied molecular orbital(HOMO) and the lowest unoccupied molecular orbital(LUMO) levels were estimated from cyclic voltammetry as-5.07 and-3.16 eV,respectively.TG indicated that Ru-[bpy(COOEt)2]2Cl2 has good themal stability under 300℃.A photovoltaic device was prepared by spin-coating thin films from a solution containing Ru-[bpy(COOEt)2]2Cl2,PCBM and PVK(1∶1∶1)(mass ratio) on an ITO(indium-tin oxide) glass using aluminum as a top electrode.Photovoltaic behavior of the device was investigated under a 55mW/cm2 white arc lamp illumination showed a typical rectifying behavior as observed through current density-voltage(J-V) characteristic measurement.The Voc,Isc and power conversion efficiency could be improved by inserting a modification layer of PEDOT∶PSS.