High power factor n-type Ag2Se/SWCNTs hybrid film for flexible thermoelectric generator

Flexible thermoelectric (TE) devices can generate electricity by harvesting the low-grade heat from curved surfaces, which has great potential in energy supply of flexible electronic and wearable sensing. Extensive research have focuses on flexible TE materials based on conductive polymers because of the light weight, but it is a huge challenge to obtain high performance and regulate conductivity type comparable to inorganic TE materials. Here, we report an n-type Ag2Se/SWCNTs hybrid film with high power factor ~1030.7 μW m-1 K-2 and excellent flexibility at room temperature. Excellent mechanical and TE properties can be attributed to its network and nano-bridge structure. A TE prototype composed of 6 -leg generates a voltage and a maximum output power of 24.8 mV and 725 nW respectively at a temperature gradient of 30 K. Our results provide insight into the design and fabrication of high-performance flexible hybrid films.