The role of electron-phonon scattering on thermoelectric properties of intermetallic compounds XSi (X = Co, Rh)

In this work, we elucidated the electronic structure and thermoelectric properties of intermetallic XSi (X = Co, Rh) compounds. By combining first-principles calculations and the Boltzmann equation within electron-phonon average approximation, thermoelectric properties of XSi are well reproduced compared to experimental observations. We found that the considerable Seebeck coefficient and low electrical resistivity give XSi a large power factor, which has the potential for thermoelectric applications. We also discussed the electron mean free paths, a possible factor affecting electrical conductivity when using the nanostructuring approach to optimize the thermoelectric performance.