Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 9, Pages 6714-6719Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b01207
Keywords
thermoelectric; Bi2Te3; hot deformation; Cu doping; power generation
Funding
- National Nature Science Foundation of China [51702334, 21875273, 51872301]
- Zhejiang Provincial Science Foundation [LY18E020017, LY18A040008]
- Youth Innovation Promotion Association, CAS [2019298, 2018337]
- [LR16E020001]
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In recent decades, bismuth telluride (Bi2Te3) has been in widespread use for normal-temperature thermoelectric cooling. However, commercial zone-melted bismuth telluride faces the big challenge of dramatically decreased thermoelectric properties at higher temperature, which limits its usage at intermediate temperature. In this contribution, the thermoelectric performance of p-type bismuth telluride is enhanced via a synergistic optimization by hot deformation and copper doping. Hot deformation treatment boosts the grain growth and exhibits donor-like effects, leading to improved electronic transport properties. Meanwhile, high-density dislocations and lattice distortions induced by dynamic recrystallization aggravate the phonon-related scattering and significantly compress the lattice thermal conductivity. In addition, copper doping effectively tunes the hole concentration, and the generated point defects also reduce the lattice thermal conductivity. Consequently, a high ZT(max) of 1.1 at 400 K and ZT(ave) of 1.0 between 300-500 K were obtained in hot-deformed Cu0.01Bi0.48Sb1.52Te3. This study suggests that the synergistic effect of hot deformation and copper doping is promising to boost the near-normal-temperature thermoelectric power generation of Bi2Te3-based thermoelectrics.
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