Linearly π-conjugated oligothiophenes as simple metal-free sensitizers for dye-sensitized solar cells

Content Provider	Semantic Scholar
Author	Demeter, Dóra Nagyné Roncali, Jean Jungsuttiwong, Siriporn Melchiorre, Fabio Biagini, Paolo Po, Riccardo
Copyright Year	2015
Abstract	Four linear oligothiophenes containing 4, 5 and 7 thiophene rings substituted by a variable number of octyl chains attached at the beta-position of some of the thiophene rings and possessing a terminal cyanoacrylic acid anchoring group have been synthesized. Results of UV-Vis absorption spectroscopy and cyclic voltammetry show that as expected the extension of the π-conjugated system leads to a decrease of the optical gap with an increase of the HOMO level. The four compounds have been evaluated as sensitizers in dye-sensitized solar cells (DSSCs) using a iodide/triiodide liquid electrolyte and the results are discussed in terms of the structure–property relationship with regard to the extension of the conjugated system and the number and position of the octyl side chains using N719 as the reference system. A power conversion efficiency of ∼7.30% corresponding to 90% of the value given by N719 under identical conditions has been obtained with one of the heptamers.
Starting Page	7756
Ending Page	7761
Page Count	6
File Format	PDF HTM / HTML
DOI	10.1039/C5TC01183C
Volume Number	3
Alternate Webpage(s)	https://pubs.rsc.org/en/content/getauthorversionpdf/C5TC01183C
Alternate Webpage(s)	https://doi.org/10.1039/C5TC01183C
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article