Thermoelectric Materials and Devices - Hierarchical Nanostructures for Energy Devices - page 109

to the induced voltage, V, across the material divided by the temperature
difference when there is no current flow, such that

r T ¼ dV

E

dT ¼ dV

dx

S ¼ (6 : 2)

dx dT

d n 3 r 4 n g | 7

.

Figure 6.1 (a) Some remarkable studies of thermoelectric materials. Reprinted with

permission from Ref. 13. Copyright r 2010 WILEY-VCH Verlag GmbH &
Co. KGaA, Weinheim. (b) Eciency of mechanical heat engines compared
with thermoelectric figures of merit. Reprinted with permission from Ref.
11. Copyright r 2009 Nature Publishing Group. 11,13