Intercorrelation of thermoelectric properties of a doped
conjugated semiconducting polymer (PIDF-BT) with charge carrier density,
conductive morphology, and crystallinity are systematically investigated.
Upon being doped with F4-TCNQ by the sequential doping method, PIDF-BT
exhibited a high electrical conductivity over 210 S cm–1. The significant enhancement of electrical conductivity resulted
from a high charge carrier density, which is attributed to the effective
charge–transfer-based integer doping between PIDF-BT and dopant
molecules. Based on the systemic characterization on the optical,
electrical, and structural properties of doped PIDF-BT annealed at
different temperatures, we investigated the characteristic correlations
between thermoelectric properties of PIDF-BT films and their four-probe
electrical conductivity, charge carrier density, and charge carrier
mobility obtained from AC Hall effect measurements. This study revealed
that exercising fine control over the crystallinity and conductive
migration of the conjugated polymer films can be a strategic approach
to suppressing the degradation of the Seebeck coefficient at high
charge carrier density and ultimately to maximizing the power factors
of organic thermoelectric devices.
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