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Measurements of Ambipolar Seebeck Coefficients in High-Mobility Diketopyrrolopyrrole Donor–Acceptor Copolymers

Author: Broch, K. · Venkateshvaran,D. · Lemaur, V. · Oliver, Y. · Beljonne, D. · Zelazny, M. · Nasrallah, I. · Harkin, D.J. · Statz, M. · Pietro, R. Di · Kronemeijer, A.J. · Sirringhaus, H.
Type:article
Date:2017
Publisher: Wiley
Source:Advanced Electronic Materials, 3, 263-270
Identifier: 862352
doi: doi:10.1002/aelm.201700225
Article number: 1700225
Keywords: Ambipolar transport · Organic semiconductors · Organic thermoelectrics · Seebeck coefficient · Industrial Innovation · 2015 Nano Technology · HOL - Holst · TS - Technical Sciences

Abstract

The Seebeck coefficient of both electrons and holes in a family of ambipolar diketopyrrolopyrrole copolymers is investigated using field-effect gated meas-urements. 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 coeffi-cients of electrons and holes have very similar magnitudes showing that elec-trons 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.