1047684-56-9Relevant articles and documents
Enhance the optical absorptivity of nanocrystalline TiO2 film with high molar extinction coefficient ruthenium sensitizers for high performance dye-sensitized solar cells
Gao, Feifei,Wang, Yuan,Shi, Dong,Zhang, Jing,Wang, Mingkui,Jing, Xiaoyan,Humphry-Baker, Robin,Wang, Peng,Zakeeruddin, Shaik M.,Graetzel, Michael
, p. 10720 - 10728 (2008)
We report two new heteroleptic polypyridyl ruthenium complexes, coded C101 and C102, with high molar extinction coefficients by extending the π-conjugation of spectator ligands, with a motivation to enhance the optical absorptivity of mesoporous titania film and charge collection yield in a dye-sensitized solar cell. On the basis of this C101 sensitizer, several DSC benchmarks measured under the air mass 1.5 global sunlight have been reached. Along with an acetonitrile-based electrolyte, the C101 sensitizer has already achieved a strikingly high efficiency of 11.0-11.3%, even under a preliminary testing. More importantly, based on a low volatility 3-methoxypropionitrile electrolyte and a solvent-free ionic liquid electrolyte, cells have corresponding >9.0% and ～7.4% efficiencies retained over 95% of their initial performances after 1000 h full sunlight soaking at 60°C. With the aid of electrical impedance measurements, we further disclose that, compared to the cell with an acetonitrile-based electrolyte, a dye-sensitized solar cell with an ionic liquid electrolyte shows a feature of much shorter effective electron diffusion lengths due to the lower electron diffusion coefficients and shorter electron lifetimes in the mesoporous titania film, explaining the photocurrent difference between these two type devices. This highlights the next necessary efforts to further improve the efficiency of cells with ionic liquid electrolytes, facilitating the large-scale production and application of flexible thin film mesoscopic solar cells.
4,4′-Unsymmetrically substituted-2,2′-bipyridines: Novel bidentate ligands on ruthenium(II) [3 + 2 + 1] mixed ligand complexes for efficient sensitization of nanocrystalline TiO2 in dye solar cells
Chandrasekharam,Kumar, Ch. Pavan,Singh, Surya Prakash,Anusha,Bhanuprakash,Islam,Han
, p. 26035 - 26046 (2013)
A series of five new ruthenium [3 + 2 + 1] complexes coded as MC107-MC111, with novel unsymmetrical bipyridines as ancillary ligands and terpyridine tricarboxylic acid as an anchoring ligand have been successfully synthesized and characterized by 1H NMR, 13C NMR and UV-Visible spectrometry. Improvement in the molar extinction coefficient of all these sensitizers was observed compared with reference standard N749 dye under comparable conditions. Among all the new sensitizers MC108 exhibited a maximum solar to electrical conversion efficiency of 5.573% (Jsc = 16.81 mA cm-2, Voc = 0.50 V. FF = 0.65) under standard global AM 1.5 G solar condition, when compared to the N749 dye with an efficiency of 6.29% (Jsc = 13.74 mA cm-2, Voc = 0.67 V. FF = 0.68) under similar fabrication and evaluation conditions. Density functional theory (DFT) and time-dependent DFT calculations are carried out for MC107-MC111 to understand their structural, electronic and photophysical properties.
A process for preparing 2,2 the 4-dipyridyl- [...], the 4 [...] -(5-hexyl-2-thiophene) method
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Paragraph 0025-0027, (2017/03/08)
The invention discloses a method for preparing 2,2'-bipyridyl-4,4-(5-hexyl-2-thiophene), and belongs to the field of organic synthesis. The method comprises the following steps: 1, reacting zinc chloride, tetrahydrofuran and a grignard reagent to prepare a zinc reagent for later use; 2, reacting 4,4-dibromo-2,2-bipyridyl with the zinc reagent under a catalytic system comprising 1,2-bis(diphenylphosphino)ethane nickel chloride, triphenylphosphine and dimethyl formamide in a nitrogen protective environment, and performing cooling, filtering, washing, recrystallizing and the like to refine an obtained product to obtain a 2,2'-bipyridyl-4,4-(5-hexyl-2-thiophene) product. According to the method, the raw materials are low in cost, a generated intermediate is nontoxic, the reaction process is easy to control, the environment pollution is less, and the method has high industrial value.
CYCLOMETALATED TRANSITION METAL DYES
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, (2012/12/13)
The present invention provides substituted cyclometalated dyes with wider absorbance bands in the visible spectrum. The compounds have hexacoordinate structures as shown in formula (I) where the central transition metal (M) is bonded to two substituted bi
