| Full text | |
| Author(s): |
Rosero, Wilmmer A. A.
[1, 2]
;
Guimaraes, Robson R.
[1]
;
Matias, Tiago A.
[1, 3]
;
Araki, Koiti
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil
[2] Inst Pesquisas Energet & Nucl IPEN CNEN SP, Av Prof Lineu Prestes 2242, BR-05508000 Sao Paulo, SP - Brazil
[3] Univ Fed ABC UFABC, Ctr Ciencias Nat & Humanas CCNH, Av Estados 5001, BR-09210580 Santo Andre, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Journal of the Brazilian Chemical Society; v. 31, n. 11, p. 2250-2264, NOV 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
A new series of tris-(bipyridyl)ruthenium-like complexes based on the 4-tripheylamine2,2':6',2 `'-terpyridine (TPA) push-pull ligand was prepared by incorporation of 4-carboxypyridine (cpy), 4,4'-dicarboxi-2,2'-bipyridine (dcbpy) and 4-carboxyterpyridine ligands (ctpy) ligands, in order to adsorb them on TiO2 in different anchoring conformations. The electron photoinjection and electron recombination processes of the respective dye-sensitized solar cells were greatly influenced by the molecular structure, which defined the surface concentration and surface charge on TiO2, such that the photoconversion efficiency was 10 times larger for {[}Ru(py)(dcbpy) (TPAtpy)] than for the {[}Ru(cpy)(bpy)(TPAtpy)](PF6) dye. Molecules anchoring in a more upright position and by a larger number of sites were shown to enhance the electron injection into TiO2 conduction band (CB) improving the short-circuit current (J(SC)), open circuit voltage (V oc) and the overall photoconversion efficiency. However, a positive net charge in the dye increased the back electron-transfer reactions and induced a decrease in both V-oc and conversion efficiency. (AU) | |
| FAPESP's process: | 18/21489-1 - Supramolecular nanotechnology: design, materials and devices |
| Grantee: | Henrique Eisi Toma |
| Support Opportunities: | Research Projects - Thematic Grants |