Achieving ZT=2.2 with Bi-doped n-type SnSe single crystals.
basic_science · Level V
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- Record sourced from PubMed, PMID 27941762.
- Also identified by DOI 10.1038/ncomms13713 and PMC identifier 5160008.
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Abstract
Recently SnSe, a layered chalcogenide material, has attracted a great deal of attention for its excellent p-type thermoelectric property showing a remarkable ZT value of 2.6 at 923 K. For thermoelectric device applications, it is necessary to have n-type materials with comparable ZT value. Here, we report that n-type SnSe single crystals were successfully synthesized by substituting Bi at Sn sites. In addition, it was found that the carrier concentration increases with Bi content, which has a great influence on the thermoelectric properties of n-type SnSe single crystals. Indeed, we achieved the maximum ZT value of 2.2 along b axis at 733 K in the most highly doped n-type SnSe with a carrier density of -2.1 × 1019 cm-3 at 773 K.