| Autor: |
Hu, Qiujun, Luo, Ding, Guo, Junbiao, Qiu, Wenbin, Wu, Xiaoyong, Yang, Lei, Wang, Zhengshang, Cui, Xudong, Tang, Jun |
| Zdroj: |
ACS Applied Materials & Interfaces; January 2023, Vol. 15 Issue: 1 p1296-1304, 9p |
| Abstrakt: |
High-energy-conversion Bi2Te3-based thermoelectric generators (TEGs) are needed to ensure that the assembled material has a high value of average figure of merit (ZTave). However, the inferior ZTaveof the n-type leg severely restricts the large-scale applications of Bi2Te3-based TEGs. In this study, we achieved and reported a high peak ZT(1.33) of three-dimensional (3D)-printing n-type Bi2Te2.7Se0.3. In addition, a superior ZTaveof 1.23 at a temperature ranging from 300 to 500 K was achieved. The high value of ZTavewas obtained by synergistically optimizing the electronic- and phonon-transport properties using the 3D-printing-driven defect engineering. The nonequilibrium solidification mechanism facilitated the multiscale defects formed during the 3D-printed process. Among the defects formed, the nanotwins triggered the energy-filtering effect, thus enhancing the Seebeck coefficient at a temperature range of 300–500 K. The effective scattering of wide-frequency phonons by multiscale defects reduced the lattice thermal conductivity close to the theoretical minimum of ∼0.35 W m–1k–1. Given the advantages of 3D printing in freeform device shapes, we assembled and measured bionic honeycomb-shaped single-leg TEGs, exhibiting a record-high energy conversion efficiency (10.2%). This work demonstrates the great potential of defect engineering driven by selective laser melting 3D-printing technology for the rational design of advanced n-type Bi2Te2.7Se0.3thermoelectric material. |
| Databáze: |
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