Polypyridyl complexes of ruthenium

To illustrate the tuning aspects of the MLCT transitions in ruthenium polypyridyl complexes, let us begin by considering the well-known ruthenium mT-bipyridine complex (1). Complex 1 shows strong visible band at 466 nm, due to charge-transfer transition from metal t2g (HOMO) orbitals to tt orbitals (LUMO) of the ligand. The Ru(II)/(III) oxidation potential is at 1.3 V, and the ligand-based reduction potential is at -1.5 V versus SCE [36]. From spectro chemical and electrochemical studies of polypyridyl complexes of ruthenium, it has been con-... 

We have developed an extensive background over a period of years with a type of chemical system—polypyridyl complexes of ruthenium—which appear to have all of the desired characteristics. As examples consider the following 1) Ru111/11 couples based on the bis-2,2 -bipyridine (bpy) complexes RuII(bpy>2L2 + (L = Cl-,... 

The photovoltaic performance of DSSC can be analyzed in terms of conversion yield and long-term stability. For metal complex-based DSSCs, the polypyridyl complexes of ruthenium and osmium are known to fulfill both criteria [29]. After the solar cell has been fabricated, it has to be evaluated for a number of parameters such as IPCE (or quantum efficiency), /sc (short-circuit current), Voc (open-circuit voltage), FF (fill factor), and rj (power conversion efficiency), which provide performance information for real-world applications. These DSSC parameters can be determined using a solar light simulator. The fill factor can assume values between 0 and less than 1 and is defined by the ratio of the maximum power (P,aax) of the solar cell per unit area divided by the and according to [7]... 

---