Triarylamine-free pyrenoimidazole-containing organic dyes with different π-linkers for dye-sensitized solar cells
Journal
Asian Journal of Organic Chemistry
Journal Volume
4
Journal Issue
2
Pages
164-172
Date Issued
2015
Author(s)
Abstract
A series of arylamine-free organic dyes that have a pyrenoimidazole donor, a cyanoacrylic acid acceptor, and different π-linkers were synthesized and characterized by optical, electrochemical, and theoretical investigations. The nature of the π-spacer exerts a significant effect on electronic properties of these dyes. The absorption maxima red-shifts on progressive addition of thiophene units in the conjugation pathway. All the dyes displayed negative solvatochromism indicative of effective solvation of the dyes by polar solvents in the ground state. The oxidation potential of the dyes shifted negatively on introduction of electron rich spacer. TDDFT computations were also performed to explain the optical and electrochemical properties of the dyes. They were demonstrated as sensitizers in dye-sensitized solar cells, the efficiency of which is promising. A piece of the π: A series of amine-free bipolar dyes featuring a pyrenoimidazole donor, a cyanoacrylic acid acceptor, and different π-linkers is reported. The dyes were used as sensitizers in dye-sensitized solar cells and their efficiencies are moderate.
SDGs
Type
journal article