Gradient copolymers of thiophene and pyrrole for photovoltaics

Ben M. Williams, Veronica Barone, Brian D. Pate, Juan E. Peralta

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The electronic properties of copolymers can be tuned by controlling their monomer ratio, and therefore can potentially be used to improve charge separation in organic photovoltaic devices. Here we show evidence based on density functional theory calculations that it is possible to control the electronic structure of π-conjugated copolymers of thiophene and pyrrole to obtain a gradient in the band gap and both conduction and valence crystal orbital band levels by controlling their composition. Our calculations predict and optimal thiophene monomer fraction range between zero and 40% is needed in order to obtain the largest electronic structure gradients.

Original languageEnglish
Pages (from-to)69-71
Number of pages3
JournalComputational Materials Science
Volume96
Issue numberPA
DOIs
StatePublished - Jan 2015

Keywords

  • Band gap
  • Copolymers
  • Density functional theory

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