Publication Type Journal Article
Title On the effect of pattern substitution and oligo(ethylene oxide) side-chain modification on thiophene-quinoxaline copolymers and their applications in photovoltaic cells
Authors Cristiana Costa Joana Farinhas Adelino M. Galvão Ana Charas
Groups MPPM
Journal ORGANIC ELECTRONICS
Year 2020
Month March
Volume 78
Number
Pages
Abstract The molecular design of conjugated polymers for efficient organic photovoltaic devices (OPVs) providing advantageous processing properties, namely solubility in low toxic solvents as ethanol, is an important issue for the progress of OPV technology. In this work, the pattern substitution and chemical nature of the side chain, either n-alkoxy or oligo(ethylene oxide) groups, in alternating thiophene-quinoxaline copolymers is varied and their effect in polymer chain grow, solubility and optical spectra is thoroughly analyzed in light of quantum mechanical calculations. Although the polymer with oligo(ethylene oxide) groups exhibited good solubility in ethanol, it was found that substituting in both meta- and para-positions of the peripheral phenyl rings attached to the quinoxaline groups causes smaller molecular weight, lower solubility in chlorinated solvents and poorer performance in photovoltaic devices. The theoretical studies revealed differences in the most energetically favored conformers for each case of the polymers substitution pattern that can justify the observed results.
DOI http://dx.doi.org/10.1016/j.orgel.2019.105612
ISBN
Publisher
Book Title
ISSN 1566-1199
EISSN 1878-5530
Conference Name
Bibtex ID ISI:000517963700045
Observations
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