The Influence of Backbone Fluorination on the Dielectric Constant of Conjugated Polythiophenes

Pierre Boufflet, Gianluca Bovo, Luca Occhi, Hua Kang Yuan, Zhuping Fei, Yang Han, Thomas D. Anthopoulos, Paul N. Stavrinou, Martin Heeney

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The ability to modify or enhance the dielectric constant of semiconducting polymers can prove valuable for a range of optoelectronic and microelectronic applications. In the case of organic photovoltaics, increasing the dielectric constant of the active layer has often been suggested as a method to control charge generation, recombination dynamics, and ultimately, the power conversion efficiencies. In this contribution, the impact that the degree and pattern of fluorination has on the dielectric constant of poly(3-octylthiophene) (P3OT), a more soluble analogue of the widely studied conjugated material poly(3-hexylthiophene), is explored. P3OT and its backbone-fluorinated analogue, F-P3OT, are compared along with a block and alternating copolymer version of these materials. It is found that the dielectric constant of the polymer thin films increases as the degree of backbone fluorination increases, in a trend consistent with density functional theory calculations of the dipole moment.
Original languageEnglish (US)
JournalAdvanced Electronic Materials
Issue number10
StatePublished - Oct 1 2018
Externally publishedYes


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