TITLE

Enhanced thermoelectric performance in PbTe-based superlattice structures from reduction of lattice thermal conductivity

AUTHOR(S)
Caylor, J. C.; Coonley, K.; Stuart, J.; Colpitts, T.; Venkatasubramanian, R.
PUB. DATE
July 2005
SOURCE
Applied Physics Letters;7/11/2005, Vol. 87 Issue 2, p023105
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have fabricated two-dimensional n-type PbTe/PbTe0.75Se0.25 structures using an evaporation process. In optimized films exhibiting a high-quality superlattice structure, a significant reduction in lattice thermal conductivity has been experimentally measured. The reduction would indicate enhanced thermoelectric device performance compared to standard PbTeSe alloys given that the electrical components, specifically, the Seebeck coefficient and electrical resistivity, were not observed to deteriorate from bulk values. The analysis of these films shows continuous layers with a true two-dimensional superlattice structure, as opposed to the PbTe/PbSe system that exhibits zero-dimensional structures from self-assembly. The room-temperature measurement of cross-plane figure-of-merit in a n-type PbTe/PbTe0.75Se0.25 device structure by the transient method has been combined with temperature-dependent measurements of in-plane resistivity and Seebeck coefficient to yield evidence of enhanced thermoelectric performance. The similarities and differences between the superlattice in the PbTe/PbTe0.75Se0.25 system and the Bi2Te3/Sb2Te3 material system are presented.
ACCESSION #
18008171

 

Related Articles

  • Optimization of the random multilayer structure to break the random-alloy limit of thermal conductivity. Yan Wang; Chongjie Gu; Xiulin Ruan // Applied Physics Letters;2/11/2015, Vol. 106 Issue 7, p1 

    A low lattice thermal conductivity (κ) is desired for thermoelectrics, and a highly anisotropic κ is essential for applications such as magnetic layers for heat-assisted magnetic recording, where a high cross-plane (perpendicular to layer) κ is needed to ensure fast writing while a low...

  • Origin of the low thermal conductivity of the thermoelectric material β-Zn4Sb3: An ab initio theoretical study. Weibing Chen; Jingbo Li // Applied Physics Letters;6/13/2011, Vol. 98 Issue 24, p241901 

    By modeling β-Zn4Sb3 material as a Zn36Sb30 crystal with defects, the crystal structure and thermal properties of β-Zn4Sb3 are studied by ab initio method to explain its extremely low thermal conductivity at moderate temperature. The formation and migration energies of defects are...

  • High figures of merit and natural nanostructures in Mg2Si0.4Sn0.6 based thermoelectric materials. Zhang, Q.; He, J.; Zhu, T. J.; Zhang, S. N.; Zhao, X. B.; Tritt, T. M. // Applied Physics Letters;9/8/2008, Vol. 93 Issue 10, p102109 

    Mg2(Si,Sn) compounds have shown great promise for thermoelectric applications due to good thermoelectric properties, nontoxicity, and abundantly available constituent elements. Herein we report on the thermoelectric properties and microstructure of high performance Mg2Si0.4−xSn0.6Sbx...

  • Unexpectedly low thermal conductivity in natural nanostructured bulk Ga2Te3. Kurosaki, Ken; Matsumoto, Hideaki; Charoenphakdee, Anek; Yamanaka, Shinsuke; Ishimaru, Manabu; Hirotsu, Yoshihiko // Applied Physics Letters;7/7/2008, Vol. 93 Issue 1, p012101 

    Here we introduce a promising thermoelectric material: Ga2Te3 with unexpectedly low thermal conductivity, in which certain kinds of superlattice structures naturally form. Two-dimensional vacancy planes with approximately 3.5 nm intervals exist in Ga2Te3, scattering phonons efficiently and...

  • Ternary eutectic growth of nanostructured thermoelectric Ag-Pb-Te materials. Wu, Hsin-jay; Foo, Wei-jian; Chen, Sinn-wen; Jeffrey Snyder, G. // Applied Physics Letters;7/9/2012, Vol. 101 Issue 2, p023107 

    Nanostructured Ag-Pb-Te thermoelectric materials were fabricated by unidirectionally solidifying the ternary Ag-Pb-Te eutectic and near-eutectic alloys using the Bridgeman method. Specially, the Bridgman-grown eutectic alloy exhibited a partially aligned lamellar microstructure, which consisted...

  • Synthesis and thermoelectric properties of half-Heusler alloy YNiBi. Shanming Li; Huaizhou Zhao; Dandan Li; Shifeng Jin; Lin Gu // Journal of Applied Physics;5/28/2015, Vol. 117 Issue 20, p1 

    The half-Heusler (HH) alloy, YNiBi, was synthesized through a reaction between Bi and the intermediate YNi phase. The thermoelectric properties of HH YNiBi were measured most thoroughly. A moderate power factor of 13.3 µWcm-1K-2 was achieved at 485 K, and rather low lattice thermal...

  • Enhancing thermoelectric properties of Cu1.8+xSe compounds. Zou, Liang; Zhang, Bo-Ping; Ge, Zhen-Hua; Zhang, Li-Juan // Journal of Materials Research;May2014, Vol. 29 Issue 9, p1047 

    P-type Cu1.8+xSe (x = 0, 0.16, 0.20) compounds were synthesized by mechanical alloying and spark plasma sintering technique. A 100% enhancement of the Seebeck coefficient was achieved in the whole temperature interval for x = 0.16 and x = 0.20 bulks compared with that of the x = 0 bulk. The...

  • Effect of Spark Plasma Sintering on the Structure and Properties of Ti1-xZrxNiSn Half-Heusler Alloys. Downie, Ruth A.; Popuri, Srinivas R.; Ning, Huanpo; Reece, Mike J.; Bos, Jan-Willem G. // Materials (1996-1944);Oct2014, Vol. 7 Issue 10, p7093 

    XNiSn (X = Ti, Zr and Hf) half-Heusler alloys have promising thermoelectric properties and are attracting enormous interest for use in waste heat recovery. In particular, multiphase behaviour has been linked to reduced lattice thermal conductivities, which enables improved energy conversion...

  • Diameter dependence of SiGe nanowire thermal conductivity. Zhao Wang; Mingo, Natalio // Applied Physics Letters;9/6/2010, Vol. 97 Issue 10, p101903 

    We theoretically compute the thermal conductivity of SiGe alloy nanowires as a function of nanowire diameter, alloy concentration, and temperature, obtaining a satisfactory quantitative agreement with experimental results. Our results account for the weaker diameter dependence of the thermal...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics