Thermoelectric Properties of Solution-Processed n-Doped Ladder-Type Conducting Polymers

Suhao Wang; Hengda Sun; Ujwala Ail; Mikhail Vagin; Per O Å Persson; Jens W Andreasen; Walter Thiel; Magnus Berggren; Xavier Crispin; Daniele Fazzi; Simone Fabiano

doi:10.1002/adma.201603731

Thermoelectric Properties of Solution-Processed n-Doped Ladder-Type Conducting Polymers

Adv Mater. 2016 Dec;28(48):10764-10771. doi: 10.1002/adma.201603731. Epub 2016 Oct 27.

Authors

Affiliations

¹ Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, SE-60174, Norrköping, Sweden.
² Thin Film Physics Division, Department of Physics Chemistry and Biology, Linköping University, SE-581 83, Linköping, Sweden.
³ Technical University of Denmark, Department of Energy Conversion and Storage, Frederiksborgvej 399, 4000, Roskilde, Denmark.
⁴ Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470, Mülheim an der Ruhr, Germany.

PMID: 27787927
DOI: 10.1002/adma.201603731

Abstract

Ladder-type "torsion-free" conducting polymers (e.g., polybenzimidazobenzophenanthroline (BBL)) can outperform "structurally distorted" donor-acceptor polymers (e.g., P(NDI2OD-T2)), in terms of conductivity and thermoelectric power factor. The polaron delocalization length is larger in BBL than in P(NDI2OD-T2), resulting in a higher measured polaron mobility. Structure-function relationships are drawn, setting material-design guidelines for the next generation of conducting thermoelectric polymers.

Keywords: broken symmetry DFT; conducting polymers; ladder-type; n-doping; polarons.