High Power Factor Flexible Ag₂Te Film on Nylon by a Wet Chemical Method for Power Generator

Herein, we develop a facile wet chemical method for the synthesis of Ag₂Te powders at room temperature and flexible Ag₂Te/nylon thermoelectric (TE) films are prepared by vacuum-assisted filtration of the synthesized Ag₂Te powders and then hot pressing. Because of the good crystallinity of Ag₂Te grains and continuous grain boundaries, an optimized film exhibits a power factor of 513 μW m^-1 K^-2 at 300 K, which stands among the highest values reported for Ag₂Te-based films to date. In addition, the film also has good flexibility. A four-leg flexible TE device assembled with the film generates a power density of 5.46 W m^-2 at a temperature gradient of 31.8 K. This work provides a facile and environmentally friendly method for preparing flexible Ag₂Te films.