Effect of electron-deficient linkers on the physical and photovoltaic properties of dithienopyrrole-based organic dyes
Journal
Journal of Materials Science: Materials in Electronics
Journal Volume
28
Journal Issue
24
Pages
18404-18417
Date Issued
2017
Author(s)
Abstract
Organic sensitizers containing dithienopyrrole donor, benzotriazole or quinoxaline in the conjugation pathway, and cyanoacrylic acid acceptor featured in a donor¡Vacceptor-£k¡Vacceptor configuration are reported. The effect of the nature of different conjugating bridges on photophysical, electrochemical and photovoltaic properties was systematically evaluated. The incorporation auxiliary acceptors broadened the absorption spectra and modulated the excited state energy levels. The DFT calculation unraveled a significant overlap of HOMO and LUMO orbitals in benzotriazole-containing dyes and the charge transfer character for the longer wavelength absorption. Among the dyes, a dye containing benzotriazole and thiophene in the conjugation pathway exhibited highest power conversion efficiency attributable to efficient electron injection and pronounced inhibition of electron recombination. ? 2017, Springer Science+Business Media, LLC.
SDGs
Other Subjects
Charge transfer; Excited states; DFT calculation; Efficient electron injection; Electron recombinations; Electron-deficient; Excited-state energy; Longer wavelength absorptions; Photovoltaic property; Power conversion efficiencies; Photovoltaic effects
Type
journal article