Fig. 4 | Nature Communications

Fig. 4

From: Composition change-driven texturing and doping in solution-processed SnSe thermoelectric thin films

Fig. 4

Thermodynamic free energy calculation. The unit cell structures for calculation. Supercells for a SnSe2 and b SnSe were expanded as much as 4 × 3 × 2 and 2 × 2 × 2, respectively. c Helmholtz free energy of SnSe2 and SnSe from first-principle calculation, where SnSe is thermodynamically more stable compared to SnSe2 in the entire temperature range from 300 to 800 K