https://scholars.lib.ntu.edu.tw/handle/123456789/385382
Title: | Organic dyes containing fluorene decorated with imidazole units for dye-sensitized solar cells | Authors: | Kumar, D. Justin Thomas, K.R. Lee, C.-P. Ho, K.-C. KUO-CHUAN HO |
Issue Date: | 2014 | Journal Volume: | 79 | Journal Issue: | 7 | Start page/Pages: | 3159-3172 | Source: | Journal of Organic Chemistry | Abstract: | New organic dyes containing fluorene functionalized with two imidazole chromophores as donors and cyanoacrylic acid acceptors have been synthesized and successfully demonstrated as sensitizers in nanocrystalline TiO 2-based dye-sensitized solar cells (DSSCs). The monoimidazole analogues were also synthesized for comparison. The Sommelet reaction of bromomethylated 2-bromo-9,9-diethyl-9H-fluorene produced the key precursor 7-bromo-9,9-diethyl-9H-fluorene-2,4-dicarbaldehyde required for the preparation of imidazole-functionalized fluorenes. Since the dyes possess weak donor segment, the electron-richness of the conjugation pathway dictated the optical, electrochemical, and photovoltaic properties of the dyes. The dyes served as sensitizers in DSSC and exhibited moderate efficiency up to 3.44%. The additional imidazole present on the fluorene has been found to retard the electron recombination due to the bulkier hydrophobic environment and led to high open-circuit voltage in the devices. © 2014 American Chemical Society. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84898061297&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/385382 |
DOI: | 10.1021/jo500330r | SDG/Keyword: | Chromophores; Open circuit voltage; Photoelectrochemical cells; Dye-Sensitized solar cell; Dye-sensitized solar cells; Electron recombinations; Functionalized; Hydrophobic environment; Nano-crystalline TiO; Organic dye; Photovoltaic property; Solar cells; acetonitrile; aldehyde derivative; cyanoacrylate; dichloromethane; dye; fluorene; imidazole derivative; n,n dimethylformamide; tetrahydrofuran; titanium dioxide; absorption spectroscopy; article; catalysis; complex formation; conjugation; electrical equipment; electrochemistry; electron; Knoevenagel condensation; light absorption; oxidation; Sonogashira reaction; Stille reaction; synthesis |
Appears in Collections: | 化學工程學系 |
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