Figure 4.

The Z parameter is reported as a function of temperature for few most common TE materials (n type). Experimental data from literature have been used, and in particular: curve BiTeSe from [23]; PbTe from [28]; skutterudites from [37]; and SiGe from [38]. Numerical estimation of the Z parameter for a silicon nanowire 50 nm wide and n-doped 5 × 10¹⁹ cm⁻³ is also reported.