Enhanced Thermoelectric Performance of Nanostructured Bi2Te3 through Significant Phonon Scattering

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• 作者：Lei Yang ; Zhi-Gang Chen ; Min Hong ; Guang Han ; Jin Zou
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 28, 2015
• 年：2015
• 卷：7
• 期：42
• 页码：23694-23699
• 全文大小：487K
• ISSN：1944-8252

文摘

N-type Bi₂Te₃ nanostructures were synthesized using a solvothermal method and in turn sintered using sparking plasma sintering. The sintered n-type Bi₂Te₃ pellets reserved nanosized grains and showed an ultralow lattice thermal conductivity (鈭?.2 W m^鈥? K^鈥?), which benefits from high-density small-angle grain boundaries accommodated by dislocations. Such a high phonon scattering leads an enhanced ZT of 0.88 at 400 K. This study provides an efficient method to enhance thermoelectric performance of thermoelectric nanomaterials through nanostructure engineering, making the as-prepared n-type nanostructured Bi₂Te₃ as a promising candidate for room-temperature thermoelectric power generation and Peltier cooling.