Evidence of improvement in thermoelectric parameters of <i>n</i>-type Bi₂Te₃/graphite nanocomposite

Improvement in thermoelectric parameters is reported with graphite incorporation n-type Bi2Te3/graphite nanocomposite systems. In-depth properties of nanostructured composites are probed both microscopically and macroscopically using x-ray diffraction, Raman spectroscopy, inelastic neutron scattering, measurement the temperature dependence thermal conductivity ?, Seebeck coefficient S, resistivity ?, carrier concentration nH. spectroscopic analysis confirms that introduces defects disorder system. Graphite addition induces a large (?17%) decrease originating from strong phonon scattering effect. A low lattice conductivity, ?L, value 0.77 W m?1 K?1, approaching ?min value, estimated Cahill–Pohl model, for Bi2Te3 + 1.0 wt. % sample. dispersion alters low-energy spectrum providing evidence modification density states. other parameters, viz., resistivity, also reported. Theoretical modeling electrical transport carried out plausible explanation underlying mechanism provided assuming simple model ballistic electron 1D contact channels two different energies.