Abstract
An n-type pyromellitic diimide polymer composite with in situ microstructure growth of the common element compound SnCl2 reaches power factor of 50-100 μW m-1 K-2, the highest purely n-type polymer composite power factor yet reported. The composite has a gigantic Seebeck coefficient between -4000 and -5000 μV K-1, many times higher than other polymer composites.
Highlights
Krebs and co-workers demonstrated that printing is the most rational choice for scalable manufacturing of large-area energy saving devices.[10]
Most prior work in polymer thermoelectrics was on p-type polymers, especially poly(ethylenedioxythiophene) (PEDOT), sometimes mixed with heavy element compound semiconductors, having power factor (PF) values >100 μW m−1 K−2 that lead to ZT > 0.1, the highest reported for polymers,[3,4,5,6,7,8,9] perhaps as great as 0.4 when doping is optimized.[14]
The first was an n-type polymer prepared by our group; S was around −40 μV K−1.[20]. Schlitz et al demonstrated solution doping of a high mobility n-type polymer, poly[N,N′-bis(2-octyldodecyl)-1,4,5,8-napthalenedicarboximide2,6-diyl]-alt-5,5′-(2,2′bithiophene)] (P(NDIOD-T2), using dihydro-1H-benzoimidazol2-yl (N-DBI) derivatives as potential dopants,[21] achieving electrical conductivities of nearly 0.01 S cm−1 and PF of 0.6 W m−1 K−2
Summary
Krebs and co-workers demonstrated that printing is the most rational choice for scalable manufacturing of large-area energy saving devices.[10]. Optical images for 40, 60, and 80 wt% SnCl2 samples obtained by spin-casting are shown in Figure S1 (Supporting Information).
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