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Measurements of Ambipolar Seebeck Coefficients in High‐Mobility Diketopyrrolopyrrole Donor–Acceptor Copolymers
Author(s) -
Broch Katharina,
Venkateshvaran Deepak,
Lemaur Vincent,
Olivier Yoann,
Beljonne David,
Zelazny Mateusz,
Nasrallah Iyad,
Harkin David J.,
Statz Martin,
Pietro Riccardo Di,
Kronemeijer Auke Jisk,
Sirringhaus Henning
Publication year - 2017
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201700225
Subject(s) - ambipolar diffusion , materials science , seebeck coefficient , electron , electron mobility , acceptor , polymer , thermoelectric effect , chemical physics , copolymer , condensed matter physics , optoelectronics , thermodynamics , chemistry , physics , composite material , thermal conductivity , quantum mechanics
The Seebeck coefficient of both electrons and holes in a family of ambipolar diketopyrrolopyrrole copolymers is investigated using field‐effect gated measurements. It is found that at high carrier concentrations the magnitude of the Seebeck coefficients is not strongly dependent on the molecular structure of the backbone within this family of polymers. Additionally, the Seebeck coefficients of electrons and holes have very similar magnitudes showing that electrons and holes experience a similar energetic landscape. Subtle differences in the carrier concentration dependence between the polymers are observed, which are interpreted in terms of different degrees of energetic disorder on the basis of molecular dynamics and electronic structure simulations.