Fig. 4
From: Thermoelectric composite with enhanced figure of merit via interfacial doping
Transport properties of a composite made of Ag-coated glass beads in a (Bi0.25Sb0.75)2Te3 host matrix. The thermopower, resistivity, power factor (α2σ), and Hall carrier concentration are shown as functions of temperature for the various volumetric filling fractions indicated. The presence of Ag-coated beads results in a strong increase in carrier concentration due to diffusion of Ag in the bulk of the host