TY  - JOUR
A1  - Zapata-Arteaga, Osnat
A1  - Marina, Sara
A1  - Zuo, Guangzheng
A1  - Xu, Kai
A1  - Dörling, Bernhard
A1  - Alberto Pérez, Luis
A1  - Sebastián Reparaz, Juan
A1  - Martín, Jaime
A1  - Kemerink, Martijn
A1  - Campoy-Quiles, Mariano
T1  - Design rules for polymer blends with high thermoelectric performance
JF  - Advanced energy materials
N2  - 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.
KW  - doping
KW  - microstructure
KW  - organic thermoelectrics
KW  - orientation
KW  - ternary
Y1  - 2022
U6  - https://doi.org/10.1002/aenm.202104076
SN  - 1614-6832
SN  - 1614-6840
VL  - 12
IS  - 19
PB  - Wiley
CY  - Weinheim
ER  -