Research published in Science (Volume 390, Issue 6779, Pages 1266-1271, December 2025) focuses on SnSe, a thermoelectric material. The researchers have extended the temperature range of the Cmcm phase of SnSe, achieving high thermoelectric performance over a wider range of temperatures. The vacancies in the structure of SnSe significantly affect its thermoelectric properties, including the power factor (PF), as shown in Figure 6 in related studies[1]. The main finding lies in the stabilization of the Cmcm phase, which improves the overall performance of the material in the conversion of heat to electricity. The study highlights the temperature dependence of the power factor, which enables practical applications in thermoelectric devices. This advancement extends the effective use of SnSe over previous limitations to a narrow temperature band.