Melt solidification rate-dependent structural and thermoelectric properties of Sb2Te3/Te nanocomposites

Polymer-mixed Sb2Te3/Te nanocomposites exhibiting p-type to n-type conduction reversal and thermal conductivity reduction

“…The single parabola band (SPB)-APS approximation is used to determine the L values from the S values. [40][41][42][45][46][47]. The κ c shows a similar trend of electrical conductivity, the decrease in carrier thermal conductivity with increasing temperature.…”

“…This might be caused by the interaction of the scattering mechanisms known as grain boundary/interfacial (metal-semiconductor) potential barrier scattering and acoustic phonon scattering (APS). [ [39][40][41][42]. The pristine Sb 2 Te 3 sample shows a higher electrical conductivity value of 70 × 10 3 S m −1 compared to other polymer mixed samples.…”

“…Figure 6(e) shows how thermal conductivity varies with temperature (κ c ). In the case of narrow bandgap materials, i.e., Sb 2 Te 3 and Bi 2 Te 3 , the total thermal conductivity is the sum of carrier (κ c ), phonon (κ p ), and bipolar thermal conductivity (κ b ), i.e., it can be expressed as κ T = κ c + κ p + κ b [39][40][41]44]. At low temperature, below 423 K, κ b is negligible.…”

“…The κ c value is estimated from Wiedemann-Franz relation κ c = LσT, L is the Lorenz number in this case. [39][40][41]44]. The single parabola band (SPB)-APS approximation is used to determine the L values from the S values.…”

Mechanical properties of Sb2Te3 nanostructures under tensile loading

“…In addition to high reliability and stability, a good thermoelectric device must have a high thermoelectric conversion efficiency, an important factor to consider during evaluation. Previous reports [31][32][33][34] suggest that nanostructured materials can increase phonon scattering and exhibit good thermoelectric properties. Disordered and defective crystal structures, including surface roughness, low-dimension defects, grain configuration, and interface effects, can enhance thermoelectric conversion efficiency.…”