Transient states and the role of excited state self-quenching of indoline dyes in complete dye-sensitized solar cells

Solar cells sensitized with near-infrared absorbing dye: Problems with sunlight conversion efficiency revealed in ultrafast laser spectroscopy studies

“…Such a spectral shift observed e.g. by us for other dyes might be an indication of a significant lowering of the S 1 state upon solvation, which leads to a more complicated mechanism of electron injection [22].…”

“…For ruthenium dyes in DSSC the commonly used approach to have such reference samples is to use high bandgap semiconductors like Al 2 O 3 or ZrO 2 instead of TiO 2 . However, for some organic dyes interacting with such reference materials, the decay of the excited state has been reported to be almost as fast as that on TiO 2 [22,[32][33][34], most probable due to the fast electron transfer to the deep trap states or intra-bandgap impurity states. Thus, in the present case, to have a reference system and for easier interpretation of the results, we took advantage of the fast decrease in the cells performance and a decrease in their photocurrent.…”

Multiwalled carbon nanotube-titania nanocomposites: Understanding nano-structural parameters and functionality in dye-sensitized solar cells

“…The most probable cause is the fact that overall efficiency of a device is a complex phenomenon influenced by numerous parameters such as layering and distribution of the dye molecules, absorption efficiency, exciton dissociation efficiency, charge carrier lifetime, recombination rates, charge transfer efficiency and charge carrier collection efficiency. [56][57][58] This suggests even though high V OC may indicate a promising device, there are still various inefficiencies at various interfaces that may result in reduced FF and J SC . Since each wt.% loading will have different physicochemical properties, together with band gap offset in relation with dye used, that interacts in a complex way.…”

Improvement of light-harvesting and electron injection efficiencies by lithium ion in D149-sensitized nanocrystalline TiO2 films

“…This finding clearly indicates that dye aggregation can be controlled by the presence of CDCA and dye concentration. Sobuś et al [19] studied the effect of addition of CDCA on the absorption spectrum of D149/TiO 2 and found that the absorption spectrum was not sensitive to the density of the dye on the surface of TiO 2 . We carried out similar experiments and obtained similar results (data not shown).…”

“…D149 ( Figure 1) is a promising sensitizing dye, and DSC devices based on this dye show a high solar light-to-energy conversion efficiency (Á > 8%) [14,15]. To understand the origin of the high performance, various characterization methods have been employed [10,[16][17][18][19]. However, in reality, the origin is still controversial because the synergy effect between a sensitizing dye and the electrolyte solution plays an important role.…”