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High performance n-type Ag 2 Se film on nylon membrane for flexible thermoelectric power generator.
Nature Communications 2019 Februrary 20
Researches on flexible thermoelectric materials usually focus on conducting polymers and conducting polymer-based composites; however, it is a great challenge to obtain high thermoelectric properties comparable to inorganic counterparts. Here, we report an n-type Ag2 Se film on flexible nylon membrane with an ultrahigh power factor ~987.4 ± 104.1 μWm-1 K-2 at 300 K and an excellent flexibility (93% of the original electrical conductivity retention after 1000 bending cycles around a 8-mm diameter rod). The flexibility is attributed to a synergetic effect of the nylon membrane and the Ag2 Se film intertwined with numerous high-aspect-ratio Ag2 Se grains. A thermoelectric prototype composed of 4-leg of the Ag2 Se film generates a voltage and a maximum power of 18 mV and 460 nW, respectively, at a temperature difference of 30 K. This work opens opportunities of searching for high performance thermoelectric film for flexible thermoelectric devices.
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