Thermoelectric properties of Bi₂O₂Se-x%AgSnSe₂ composites via liquid assisted shear exfoliation- restacking process

In this study, the thermoelectric properties of Bi₂O₂Se-x%AgSnSe₂ composites via liquid assisted shear exfoliation- restacking (LASE-R) method were investigated. The results show that Ag can diffuse into Bi₂O₂Se to further improve the electron content and the electrical conductivity. Meanwhile, the absolute Seebeck coefficient gets a little deterioration with an increase in the electron content and the effective mass. Besides, the rest AgSnSe₂ can further reduce the lattice thermal conductivity of Bi₂O₂Se through enhanced interfaces and mass fluctuation scattering of the phonons by compositing with AgSnSe₂. Finally, a ZT_max of 0.58 for Bi₂O₂Se-1%AgSnSe₂ was obtained, which is 1.24 times that of Bi₂O₂Se.