AI Article Synopsis
- Researchers developed high-energy-conversion BiTe-based thermoelectric generators (TEGs) that achieve improved performance by enhancing the n-type leg's figure of merit (zT).
- They utilized 3D printing and defect engineering to optimize electronic and phonon transport properties, resulting in a peak zT of 1.33 and a significant reduction in thermal conductivity.
- The study demonstrated the potential of these 3D-printed materials, achieving an impressive energy conversion efficiency of 10.2% with a unique honeycomb design for TEGs.
Article Abstract
High-energy-conversion BiTe-based thermoelectric generators (TEGs) are needed to ensure that the assembled material has a high value of average figure of merit (). However, the inferior of the n-type leg severely restricts the large-scale applications of BiTe-based TEGs. In this study, we achieved and reported a high peak (1.33) of three-dimensional (3D)-printing n-type BiTeSe. In addition, a superior of 1.23 at a temperature ranging from 300 to 500 K was achieved. The high value of was 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 k. 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 BiTeSe thermoelectric material.
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| http://dx.doi.org/10.1021/acsami.2c19131 | DOI Listing |
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