Two thiophene-based semiconductors, a vapor-deposited small molecule and an amorphous polymer, as well as pentacene for comparison, show potential in enhancing the thermoelectric properties of tellurium (Te) nanowires. For vapor-deposited films, Te nanostructures form directly on glass substrates or organic semiconductor films. The resulting Te power factor (S2σ) was enhanced from 36 to 45 W/mK2 (56 for pentacene) because the bilayer provides an enhancement in Seebeck (S) without compromising conductivity (a). For solution deposited polymer blends, we obtained power factors from a Te nanowire network that alone would not have sufficient connectivity (up to 0.1 µW/mK2). While the organics are unoptimized, they are prototypical materials for further development.
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We thank the Department of Energy Office of Basic Energy Sciences, Grant Number DE-FG02-07ER46465 for support of this work.
These authors contributed equally to this work.
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Sinha, J., Ireland, R.M., Lee, S.J. et al. Synergistic thermoelectric power factor increase in films incorporating tellurium and thiophene-based semiconductors. MRS Communications 3, 97–100 (2013). https://doi.org/10.1557/mrc.2013.14