849680-56-4Relevant academic research and scientific papers
Fluorine substituent effect on organic dyes for sensitized solar cells
Lin, Yan-Duo,Chow, Tahsin J.
, p. 47 - 54 (2012)
Two sets of organic dyes containing a stilbene backbone with fluorine substituents were designed for a study on the quantum efficiency of dye-sensitized solar cells (DSSCs). The results revealed that adding a fluorine substituent on the phenyl group ortho to the cyanoacrylate can enhance the light-harvesting performance in comparison with the unsubstituted one. However, when the two ortho-positions were both substituted by fluorine atoms, the performance of DSSCs was substantially reduced. The reason was mainly ascribed to a distortion from a planar geometry caused by steric hindrance. The π-conjugation was therefore disturbed, and the result led to a substantial reduction of the short-circuit photocurrent density (Jsc). Another effect was found that the open-circuit photovoltage (Voc) of the doubly substituted derivative was lower than that of the mono-substituted one. The more flexible conformation of the difluoro-substituted dyes induced an undesired nonradiative decay, therefore led to a reduction of open-circuit photovoltage. The phenomenon can be verified by electrochemical impendence spectrum. The non-planar geometry was realized by a computation using the density function theory (DFT) model. The slight blue shift of absorption band was also consistent with the calculated transition energy by a time dependent DFT model.
STILBENE DERIVATIVES FOR THE TREATMENT OF CNS AND OTHER DISORDERS
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, (2018/12/03)
The present application discloses stilbene derivative compounds and compositions, and methods for treating ocular diseases, neurological disorders and protein aggregation-related disorders in patients using the compounds and compositions as disclosed herein.
Ultra-fast co-sensitization and tri-sensitization of dye-sensitized solar cells with N719, SQ1 and triarylamine dyes
Holliman, Peter J.,Mohsen, Moneer,Connell, Arthur,Davies, Matthew L.,Al-Salihi, Kareem,Pitak, Mateusz B.,Tizzard, Graham J.,Coles, Simon J.,Harrington, Ross W.,Clegg, William,Serpa, Carlos,Fontes, Octavio H.,Charbonneau, Cecile,Carnie, Matthew J.
, p. 13318 - 13327 (2012/08/28)
This paper describes the synthesis of a new, yellow triphenylamine dye, 4-[2-(4-diphenylaminophenyl)vinyl]benzoic acid] (6), with a sorption maximum at 380 nm in solution for which EQE data show shifts to 420 nm on sorption to TiO2. The performance of this dye has been measured in dye-sensitized solar cell (DSC) devices, showing η = 2.6% for 1 cm2 devices. Light soaking of (6) shows excellent long-term stability with 2 photo-electrodes in 5 minutes using one or two dyes and the first example of ultra-fast tri-sensitization. The dyes tested include the ruthenium dye N719, the squaraine dye SQ1, the red triphenylamine dye 2-cyano-3-{4-[2-(4-diphenylaminophenyl) vinyl]phenyl}acrylic acid (5) and (6). DSC efficiencies of 7.5% have been achieved for 1 cm2 devices co-sensitized using (6) and N719. These efficiencies exceed those recorded for single dye devices and EQE measurements confirm efficient photon capture from two or more dyes in a single photo-electrode. Photo-acoustic calorimetry (PAC) has also been used to measure the energy of the charge separation states formed for (6) and N719, showing a larger value (1.47 eV) for (6) compared to N719 (1.08 eV), whilst a TiO 2 film co-sensitized with both (6) and N719 gave an intermediate value (1.28 eV). These data have been used to calculate dye HOMO, LUMO and λmax levels for (6) and N719 leading to important insights for future successful co-sensitization.
