Molten drawing inorganic ductile Ag₂S_0.7Te_0.3 fibers with high thermoelectric performance and stability

One potential application for flexible thermoelectric (TE) devices based on inorganic ductile fiber materials is the development of self-powered wearable electronics. In the work, the molten drawing method was employed for fabricating inorganic ductile Ag₂S_0.7Te_0.3 fibers. The output voltage and maximum output power of the single fiber are 3.3 mV and 837.4 nW, respectively, under a temperature difference of 50 K. The Ag₂S_0.7Te_0.3 fiber shows outstanding stability performance in the service stability test with a critical electric density of 36 A cm⁻² and exhibits a tensile strain of 5%. The high temperature sensitivity of the Ag₂S_0.7Te_0.3 fibers TE device demonstrates the application potential in wearable electronics products.