@article{b71a26d270c04b68af395a3908935fad,
title = "Temperature dependent band gap in PbX (X = S, Se, Te)",
abstract = "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 Σ 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 673 K and predict a band convergence temperature of 700 K, much higher than previous measurements showing saturation and band convergence at 450 K.",
author = "Gibbs, {Zachary M.} and Hyoungchul Kim and Heng Wang and White, {Robert L.} and Fivos Drymiotis and Massoud Kaviany and {Jeffrey Snyder}, G.",
note = "Funding Information: The authors would like to acknowledge fruitful discussions with Professor Yanzhong Pei (Tongji University). Also, we would like to thank the Molecular Materials Research Center at the California Institute of Technology for allowing use of their equipment for the optical measurements performed in this work. ZMG, HW, FD, and GJS would like to thank our funding sources at NASA/Jet Propulsion Laboratory and AFOSR MURI FA9550-10-1-0533. The work by MK and HCK was supported as part of the Center for Solar and Thermal Energy Conversion at the University of Michigan, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC-0000957.",
year = "2013",
month = dec,
day = "23",
doi = "10.1063/1.4858195",
language = "English (US)",
volume = "103",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "26",
}