PbTe based superlattice structures with high thermoelectric efficiency

Beyer, H.; Nurnus, J.; Bo¨ttner, H.; Lambrecht, A.; Roch, T.; Bauer, G.
February 2002
Applied Physics Letters;2/18/2002, Vol. 80 Issue 7, p1216
Academic Journal
We report on an enhanced thermoelectric figure of merit ZT =σS[SUP 2]T/λ (where σ is electrical conductivity, S is thermopower, T is absolute temperature, and λ is thermal conductivity) for PbTe/PbSe[SUB 0.20]Te[SUB 0.80] superlattices (SLs) and PbTe doping SLs due to a reduction of the thermal conductivity λ parallel to the layer planes. Despite a small decrease of the power factors σS[SUP 2] due to a reduction of σ in these superlattices, the figure of merit is higher as compared to the corresponding bulk materials and reaches maximum values in the temperature range between 400 and 570 K.


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