1123693-92-4Relevant academic research and scientific papers
Atomic level resolution of dye regeneration in the dye-sensitized solar cell
Robson, Kiyoshi C. D.,Hu, Ke,Meyer, Gerald J.,Berlinguette, Curtis P.
supporting information, p. 1961 - 1971 (2013/04/10)
Two donor-acceptor organic dyes have been synthesized that differ only by a two-heteroatom change from oxygen to sulfur within the donor unit. The two dyes, (E)-3-(5-(4-(bis(4-(hexyloxy)phenyl)amino)phenyl)thiophen-2-yl)-2- cyanoprop-2-enoic acid (Dye-O) and (E)-3-(5-(4-(bis(4-(hexylthio)phenyl)amino) phenyl)thiophen-2-yl)-2-cyanoprop-2-enoic acid) (Dye-S), were tested in solar cell devices employing both I3-/I--based and [Co(bpy)3]3+/2+ redox mediators. Power conversion efficiencies over 6% under simulated AM 1.5 illumination (1 Sun) were achieved in both electrolytes. Despite similar optical and redox properties for the two dyes, a consistently higher open-circuit voltage (Voc) was measured for Dye-S relative to Dye-O. The improved efficiency observed with Dye-S in an iodide redox mediator is against the commonly held view that sulfur atoms promote charge recombination attributed to inner-sphere interactions. Detailed mechanistic studies revealed that this is a consequence of a 25-fold enhancement of the regeneration rate constant that enhances the regeneration yield under open circuit conditions. The data show that a high short circuit photocurrent does not imply optimal regeneration efficiency as is often assumed.
New panchromatic dyes comprising benzothiadiazole units within a donor-acceptor π-conjugated spacer. Synthesis and photophysical properties
Pati, Palas Baran,Zade, Sanjio S.
, p. 2167 - 2174 (2013/03/14)
Four new organic dyes (D1-D4) having donor-(π-conjugated spacer(donor-acceptor))-acceptor (D-π(D-A)-A) type conjugated systems were synthesized. The dyes were studied for their photophysical and electrochemical properties. The dyes comprised electron donor bis(4-hexyloxy)triphenylamine (D), and electron acceptor cyanoacrylic acid (A) ends connected through a donor-acceptor conjugated spacer group. The conjugated spacer was designed as donor-acceptor system having thiophene to terthiophene and selenophene as donors and benzothiadiazole as acceptor. Thus, optical absorption strengths of the dyes successfully tuned by using the electron accepting property of benzothiadiazole and varying numbers of thiophenes and selenophene. Panchromatic absorption with high extinction coefficient was observed for all four dyes D1-D4.
A light-resistant organic sensitizer for solar-cell applications
Yum, Jun-Ho,Hagberg, Daniel P.,Moon, Soo-Jin,Karlsson, Karl Martin,Marinado, Tannia,Sun, Licheng,Hagfeldt, Anders,Nazeeruddin, Mohammad K.,Graetzel, Michael
experimental part, p. 1576 - 1580 (2009/06/30)
(Figure Presented) Finely tuned: A stable dye-sensitized solar cell that contains a molecularly engineered organic dye has been prepared. The efficiency of the cell remains at 90% after 1000 h of light soaking at 60 °C. The remarkable stability of the cel
