Power generation and thermoelectric cooling enabled by momentum and energy multiband alignments.
basic_science · Level V
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- Record sourced from PubMed, PMID 34326238.
- Also identified by DOI 10.1126/science.abi8668.
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Abstract
Thermoelectric materials transfer heat and electrical energy, hence they are useful for power generation or cooling applications. Many of these materials have narrow bandgaps, especially for cooling applications. We developed SnSe crystals with a wide bandgap (<i>E</i> <sub>g</sub> ≈ 33 <i>k</i> <sub>B</sub> <i>T</i>) with attractive thermoelectric properties through Pb alloying. The momentum and energy multiband alignments promoted by Pb alloying resulted in an ultrahigh power factor of ~75 μW cm<sup>-1</sup> K<sup>-2</sup> at 300 K, and an average figure of merit <i>ZT</i> of ~1.90. We found that a 31-pair thermoelectric device can produce a power generation efficiency of ~4.4% and a cooling Δ<i>T</i> <sub>max</sub> of ~45.7 K. These results demonstrate that wide-bandgap compounds can be used for thermoelectric cooling applications.