Gibbs, Zachary M. Kim, Hyoungchul Wang, Heng White, Robert L. Drymiotis, Fivos Kaviany, Massoud Snyder, G. Jeffrey 2024-01-20T11:00:49Z 2024-01-20T11:00:49Z 2021-09-05 2013-12-23 0003-6951 https://pubs.kist.re.kr/handle/201004/127319 PbTe is an important thermoelectric material for power generation applications due its high conversion efficiency and reliability. Its extraordinary thermoelectric performance is attributed to band convergence of the light L and heavy Sigma bands. However, the temperature at which these bands converge is disputed. In this letter, we provide direct experimental evidence combined with ab initio calculations that confirm an increasing optical gap up to 673K and predict a band convergence temperature of 700K, much higher than previous measurements showing saturation and band convergence at 450K. (C) 2013 AIP Publishing LLC. English AMER INST PHYSICS PERFORMANCE BULK THERMOELECTRICS P-TYPE PBTE LEAD TELLURIDE VALENCE BAND OPTICAL PROPERTIES ABSORPTION-COEFFICIENT ELECTRONIC PROPERTIES ENERGY-GAP PBSE Temperature dependent band gap in PbX ( X = S, Se, Te) Article 10.1063/1.4858195 1 APPLIED PHYSICS LETTERS, v.103, no.26 APPLIED PHYSICS LETTERS 103 26 scie scopus 000329977400036 2-s2.0-84891605745 Physics, Applied Physics Article PERFORMANCE BULK THERMOELECTRICS P-TYPE PBTE LEAD TELLURIDE VALENCE BAND OPTICAL PROPERTIES ABSORPTION-COEFFICIENT ELECTRONIC PROPERTIES ENERGY-GAP PBSE Chalcogenide Semiconductor Thermoelectrics Band gap Solid-state physics