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Design Rules for Polymer Blends with High Thermoelectric Performance
Author(s) -
ZapataArteaga Osnat,
Marina Sara,
Zuo Guangzheng,
Xu Kai,
Dörling Bernhard,
Pérez Luis Alberto,
Reparaz Juan Sebastián,
Martín Jaime,
Kemerink Martijn,
CampoyQuiles Mariano
Publication year - 2022
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202104076
Subject(s) - materials science , raman spectroscopy , polymer , differential scanning calorimetry , thermoelectric effect , characterization (materials science) , raman scattering , analytical chemistry (journal) , chemical engineering , nanotechnology , composite material , thermodynamics , optics , organic chemistry , chemistry , physics , engineering
Abstract A combinatorial study of the effect of in‐mixing of various guests on the thermoelectric properties of the host workhorse polymer poly[2,5‐bis(3‐tetradecylthiophen‐2‐yl)thieno[3,2‐b]thiophene] (PBTTT) is presented. Specifically, the composition and thickness for doped films of PBTTT blended with different polymers are varied. Some blends at guest weight fractions around 10–15% exhibit up to a fivefold increase in power factor compared to the reference material, leading to zT values around 0.1. Spectroscopic analysis of the charge‐transfer species, structural characterization using grazing‐incidence wide‐angle X‐ray scattering, differential scanning calorimetry, Raman, and atomic force microscopy, and Monte Carlo simulations are employed to determine that the key to improved performance is for the guest to promote long‐range electrical connectivity and low disorder, together with similar highest occupied molecular orbital levels for both materials in order to ensure electronic connectivity are combined.