'Revealing unipolar thermoelectric performance in bipolar polymer' - a 'National Science Open' article published by @EDPSciences on #ScienceOpen:
https://www.scienceopen.com/document?vid=b75c891a-823a-4452-aa26-963f808ea58a
ScienceOpenRevealing unipolar thermoelectric performance in bipolar polymer<p xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="first" dir="auto" id="d10034242e292">Conjugated polymers are attracting increased attention as thermoelectric (TE) materials
for energy harvesting applications in low-temperature regimes. However, in many doped
ambipolar polymers, the simultaneous transport of both holes and electrons under temperature
gradients leads to an offset in thermopower (
<i>S</i>), which suppresses TE performance and complicates intrinsic understanding of bipolar
TE conversion. Herein, we quantitatively investigate the p-n polarity transition in
FeCl
<sub>3</sub>-doped bipolar PDPP4T films by measuring the magneto-thermoelectric Nernst effect,
combined with Hall and Seebeck effect analyses. Notably, behind the
<i>S =</i> 0 point, we observe a significant thermopower offset originating from the balancing
contributions of electrons and holes. This countervailing thermopower value is extracted
to reach 400 μV K
<sup>−1</sup>, which could ideally produce an estimated maximum unipolar ZT of 0.24 at 175 K, due
to rising polaron states and reduced carrier concentration. Our findings reveal the
extraordinary hidden unipolar TE performance achievable in doped bipolar polymer towards
ultra-low-temperatures thermoelectric.
</p>
Chemiker:in – Polymere Materialien und Klebstoffe als Wissenschaftliche:n Assistent:in 100 % 
11 Doctoral Researcher (m/w/d)
