Abstract
Experimental evidence is presented for an enhanced thermoelectric figure of merit ZT= σS 2 T/ λ (where σ is the electrical conductivity, S the thermopower, T the temperature, and λ is the thermal conductivity) by a reduction of the thermal conductivity λ in PbTe- and Bi 2Te 3-superlattices (SLs) parallel to the layer planes. Data on thermoelectric properties of Bi 2Te 3/Bi 2(Se x Te 1− x ) 3-SLs, of PbTe-based doping SLs, and PbTe/PbSe 0.2Te 0.8-SLs are presented. In these structures, a decrease of λ was measured compared to the corresponding bulk compounds or homogeneous alloys. Despite a drop of the total power factor σS 2 in the SLs in total an enhancement of the figure of merit ZT is found in these highly-doped PbTe and Bi 2Te 3-based SLs.
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