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

Wang, Suhao; Sun, Hengda; Ail, Ujwala; Vagin, Mikhail; Persson, Per O Å; Andreasen, Jens W; Thiel, Walter; Berggren, Magnus et al. · Adv Mater · 2016

basic_science · Level V

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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.