Silver selenide is considered as a promising room temperature thermoelectric material due to its excellent performance and high abundance. However, the silver selenide-based flexible film is still behind in thermoelectric performance compared with its bulk counterpart. In this work, the composition of paper-supported silver selenide film was successfully modulated through changing reactant ratio and annealing treatment. In consequence, the power factor value of 2450.9 ± 364.4 μW/(mK²) at 303 K, which is close to that of state-of-the-art bulk Ag₂Se has been achieved. Moreover, a thermoelectric device was fabricated after optimizing the length of annealed silver selenide film via numerical simulation. At temperature difference of 25 K, the maximum power density of this device reaches 5.80 W/m², which is superior to that of previous film thermoelectric devices. Theoretically and experimentally, this work provides an effective way to achieve silver-selenide-based flexible thermoelectric film and device with high performance.

硒化银由于其优异的性能和高的丰度而被认为是有前途的室温热电材料。但是，与硒化银基柔性膜相比，其整体性能仍落后于热电性能。在这项工作中，通过改变反应物比例和退火处理，成功地调节了纸质硒化银薄膜的组成。因此，在303 K时的功率因数值为2450.9±364.4μW/（mK ²），接近最新的块状Ag ₂的功率因数硒已实现。此外，在通过数值模拟优化退火的硒化银膜的长度之后，制造了热电器件。在25 K的温差下，此设备的最大功率密度达到5.80 W / m ²，这优于以前的薄膜热电设备。从理论上和实验上，这项工作为实现高性能的硒化银基柔性热电薄膜和器件提供了有效的途径。