Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator

Autor:	Gareoung Kim, Jong-Soo Rhyee, Jin Hee Kim, Hyungyu Jin, Seokyeong Byeon
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	Materials science Pb-excess Mean free path Analytical chemistry Sintering 02 engineering and technology 010402 general chemistry thermoelectric 01 natural sciences lcsh:Technology Article Crystal Cl-doping Effective mass (solid-state physics) Seebeck coefficient Thermal Thermoelectric effect crystalline mirror symmetry breaking General Materials Science (Pb Sn)Se lcsh:Microscopy lcsh:QC120-168.85 lcsh:QH201-278.5 lcsh:T Doping 021001 nanoscience & nanotechnology 0104 chemical sciences lcsh:TA1-2040 lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971
Zdroj:	Materials Materials, Vol 14, Iss 1920, p 1920 (2021) Volume 14 Issue 8
ISSN:	1996-1944
Popis:	We investigated the thermoelectric properties of the Pb0.75Sn0.25Se and Pb0.79Sn0.25Se1−xClx (x = 0.0, 0.2, 0.3, 0.5, 1.0, 2.0 mol.%) compounds, synthesized by hot-press sintering. The electrical transport properties showed that low concentration doping of Cl (below 0.3 mol.%) in the Pb-excess (Pb,Sn)Se samples increased the carrier concentration and the Hall mobility by the increase of carriers’ mean free path. The effective mass of the carrier was also enhanced from the measurements of the Seebeck coefficient. The enhanced effective masses of the carrier by the Cl-doping can be understood by the enhanced electron-phonon interaction, caused by the crystalline mirror symmetry breaking. The significantly decreased lattice thermal conductivities showed that the crystalline mirror symmetry breaking decreased the lattice thermal conductivity of the Pb-excess (Pb,Sn)Se. By the Cl-doping and the Pb-excess’s synergistic effect, which can suppress the bipolar effect, the zT values of x = 0.2 and 0.3 mol.% reached 0.8 at 773 K. Therefore, we suggest that Pb-excess and the crystalline mirror symmetry breaking by Cl-doping are effective for high thermoelectric performance in the (Pb,Sn)Se.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46e40b1c40401223c28193c64214976d http://europepmc.org/articles/PMC8069562 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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