Extended Data Figure 6: Thermoelectric properties as a function of temperature for crystalline SnSe along different directions.
From: Ultralow thermal conductivity and high thermoelectric figure of merit in SnSe crystals
a, Thermal diffusivity. b, Heat capacity. c, Electronic thermal conductivity. d, The ratio of lattice thermal conductivity (κlat) to total thermal conductivity (κtot). The Lorenz number (L) used for obtaining κlat (κlat = κtot − σLT, where σ is the electrical conductivity and T is absolute temperature) was approximately equal to 1.5 × 10−8 V2 K−2 since the undoped SnSe is a non-degenerate semiconductor; the ratio of κlat to κtot indicates that κtot is dominated by phonon transport.
