کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5216164 | 1383254 | 2014 | 11 صفحه PDF | دانلود رایگان |
Three novel organic dyes (DF13A-C) carrying regioisomeric carboxypyridine anchoring groups were synthesized by means of a multistep synthetic sequence involving a Pd-catalyzed Stille coupling as the key step. The new compounds underwent full spectroscopic, electrochemical, and computational characterization, and their properties were compared with those of a reference compound endowed with a classic cyanoacrylic acid acceptor (DF15). Photovoltaic measurements showed that dye-sensitized solar cells built with dyes DF13A-C as photosensitizers yielded power conversion efficiencies corresponding to 54-63% of those obtained with the reference compound. Determination of desorption pseudo-first order rate constants indicated that isomers DF13B-C, having the nitrogen atom in neighboring position relative to the carboxylic moiety, were removed from TiO2 more slowly than isomer DF13A or cyanoacrylic derivative DF15, suggesting a possible cooperative effect of the two functional groups on semiconductor binding: such hypothesis was supported by device stability tests carried out on transparent, larger area cells.
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Journal: Tetrahedron - Volume 70, Issue 36, 9 September 2014, Pages 6285-6295