Crystallite

Chemistry

Metallurgy

Materials science

Chromatography

Optoelectronics

Engineering

Solid solution

Composite material

Thermoelectric effect

Physics

Dopant

Bismuth telluride

Bismuth

Lead telluride

Electrical resistivity and conductivity

Charge carrier

Seebeck coefficient

Analytical Chemistry (journal)

Thermal conductivity

Electrical engineering

Thermoelectric materials

Doping

Phonon scattering

Thermodynamics

Advanced Science

The recent growing energy crisis draws considerable attention to high-performance thermoelectric materials. n-type bismuth telluride is still irreplaceable at near room temperature for commercial application, and therefore, is worthy of further investigation. In this work, nanostructured Bi2 Te3 polycrystalline materials with highly enhanced thermoelectric properties are obtained by alkali metal Na solid solution. Na is chosen as the cation site dopant for n-type polycrystalline Bi2 Te3 . Na enters the Bi site, introducing holes in the Bi2 Te3 matrix and rendering the electrical conductivity tunable from 300 to 1800 Scm-1 . The solid solution limit of Na in Bi2 Te3 exceeds 0.3 wt%. Owing to the effective solid solution, the Fermi level of Bi2 Te3 is properly regulated, leading to an improved Seebeck coefficient. In addition, the scattering of both charge carriers and phonons is modulated, which ensured a high-power factor and low lattice thermal conductivity. Benefitting from the synergistic optimization of both electrical and thermal transport properties, a maximum figure of merit (ZT) of 1.03 is achieved at 303 K when the doping content is 0.25 wt%, which is 70% higher than that of the pristine sample. This work disclosed an effective strategy for enhancing the performance of n-type bismuth telluride-based alloy materials.

Tunable Electrical Conductivity and Simultaneously Enhanced Thermoelectric and Mechanical Properties in n‐type Bi<sub>2</sub>Te<sub>3</sub>

Tunable Electrical Conductivity and Simultaneously Enhanced Thermoelectric and Mechanical Properties in n‐type Bi2Te3

Tunable Electrical Conductivity and Simultaneously Enhanced Thermoelectric and Mechanical Properties in n‐type Bi₂Te₃