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New functional triethoxysilanes as iodide sources for dye-sensitized solar cells

Paper ID Volume ID Publish Year Pages File Format Full-Text
27482 44026 2008 6 PDF Available
Title
New functional triethoxysilanes as iodide sources for dye-sensitized solar cells
Abstract

Three new triethoxysilanes bearing quaternary ammonium alkyl iodides are reported, N,N,N-triethyl-3-(triethoxysilyl)propan-1-aminium iodide 1, N,N,N-triheptyl-3-(triethoxysilyl)propan-1-aminium iodide 2 and N,N,N-tridodecyl-3-(triethoxysilyl)propan-1-aminium iodide 3. 1H and 13C NMR spectroscopy and electrospray mass spectrometry were used to confirm the synthesis of pure products. Electrolytes based on these ionic liquids were developed and their performance in dye-sensitized solar cells (DSSCs) evaluated. The electrolytes incorporated 1 and 2 (in 30–60 wt%) as iodide sources together with I2 (0.08 M), 0.1 M guanidinium thiocyanate and 0.5 M tert-butylpyridine in acetonitrile (AN); and I2 (0.15 M) and N-methylbenzimidazole (0.5 M) for 2-methoxyproprionitrile (MPN) as co-solvent. Testing of DSSCs to analyze the influence of chain length (ethyl and heptyl) on cell efficiency revealed that, for silanes concentration of 1 M, electrolyte B (based on 2 in AN) and electrolyte C (based on 1 in MPN) gave the best cell efficiency at simulated full sunlight (AM 1.5, 1000 W m−2) illumination (5.0–5.3%). At 0.1 Sunlight (AM 1.5, 100 W m−2), electrolyte B gave the best performance of 8.0%. High open circuit voltages (VOC) of 750–850 mV were achieved for a number of quite efficient cells (5–6%). For silane 2, variation of the I−/I2 ratio and total silane content (1–2 M 2) on DSSC efficiency gave a consistent efficiency of 8.0% at 0.1 Sunlight. At full sunlight, the cell efficiency decreased as the silane concentration increased from 1 M (5.0%) to 2 M (3.7%), largely due to a drop in short circuit current.

Graphical abstractThree new alkoxysilanes, functionalized with quaternary alkylammonium iodide salts (n = 1 ethyl, n = 6 heptyl and n = 11 dodecyl), have been prepared and used in the electrolytes of dye-sensitized solar cells (DSSCs); the heptyl derivative resulting in DSSCs with particularly good performance at 0.1 Sunlight (8% efficiency).Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Dye-sensitized solar cells; Electrolytes; Ionic liquids; Alkoxysilanes; Alkylammonium iodide salts; Synthesis
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New functional triethoxysilanes as iodide sources for dye-sensitized solar cells
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 198, Issues 2–3, 15 August 2008, Pages 186–191
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us