title: Bandgap-Tuning in Triple-Chalcogenophene Polymer Films by Thermal Annealing.
abstract: The authors study adjustable bandgap properties of the novel triple chalcogenophene-based polymer poly-(3-hexyl-2(3-(4-hexylthiophene-2-yl)-4,5-butylselenophene-1-yl)-5-(4,5-butyltellurophene-1-yl)thiophene) through a combination of morphological, spectroscopic, and computational techniques. The bandgap can be tuned after polymerization by means of mild temperature annealing, which will allow for a partnership with a broader range of donor/acceptor molecules, a property that makes it potentially suitable for organic photovoltaic implementation. The bandgap is modified by selection of the annealing temperatures, and the process is arguably related to the aggregation of tellurophene units, as similar effects are observed in polytellurophenes. Moreover, adequate chemistry engineering ensures easy solution processability and attainment of homogeneous films, which is also essential for applications.
authors.affiliation: Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748, Garching, Germany.
authors.forename: Daniel Moseguí
authors.initials: DM
authors.lastname: González
authors.affiliation: Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748, Garching, Germany.
authors.forename: Konstantinos N
authors.initials: KN
authors.lastname: Raftopoulos
authors.affiliation: Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, T6G 2G2, Canada.
authors.forename: Gang
authors.initials: G
authors.lastname: He
authors.affiliation: Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748, Garching, Germany.
authors.forename: Christine M
authors.initials: CM
authors.lastname: Papadakis
authors.affiliation: Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, T6G 2G2, Canada.
authors.forename: Alex
authors.initials: A
authors.lastname: Brown
authors.affiliation: Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta, T6G 2G2, Canada.
authors.forename: Eric
authors.initials: E
authors.lastname: Rivard
authors.affiliation: Lehrstuhl für Funktionelle Materialien/Fachgebiet Physik Weicher Materie, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748, Garching, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Müller-Buschbaum
mesh_terms: D058105:Polymerization; D011108:Polymers / Q000737:chemistry*; D013696:Temperature; D013876:Thiophenes
chemical_list: D011108:Polymers; D013876:Thiophenes
keywords: WAXS; bandgap tuning; chalcogenophenes; group-16 chemistry; organic photovoltaics