YbCu2Si2–LaCu2Si2 Solid Solutions with Enhanced Thermoelectric Power Factors

Gloria J. Lehr, Donald T. Morelli, Hyungyu Jin, Joseph P. Heremans

Research output: Contribution to journalArticle

  • 5 Citations

Abstract

Cryogenic Peltier coolers are ideal for cooling infrared sensors on satellites. To make these thermoelectric devices a realistic option for this application, the efficiency of thermoelectric materials at cryogenic temperatures must be substantially enhanced. Intermediate valence Yb-based compounds have large peaks in the Seebeck coefficient at low temperatures; to optimize these materials this must be understood. We created solid solutions between the intermediate valence compound YbCu2Si2 and an isostructural compound LaCu2Si2 to manipulate the temperature at which the Seebeck coefficient peaks and to maximize zT by reduction of lattice thermal conductivity. An enormous power factor of 110 μW/cm K2 at 100 K and a maximum zT of 0.14 at 125 K were achieved for one of these solid solutions.

LanguageEnglish (US)
Pages1663-1667
Number of pages5
JournalJournal of Electronic Materials
Volume44
Issue number6
DOIs
StatePublished - Jun 1 2015

Profile

Thermoelectric power
Seebeck effect
Solid solutions
solid solutions
Seebeck coefficient
valence
Cryogenics
thermoelectric materials
cryogenic temperature
coolers
cryogenics
thermal conductivity
cooling
Temperature
Thermal conductivity
sensors
Satellites
Cooling
Infrared radiation
Sensors

Keywords

  • intermediate valence
  • solid solutions
  • thermoelectric properties
  • YbCu<inf>2</inf>Si<inf>2</inf>

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

YbCu2Si2–LaCu2Si2 Solid Solutions with Enhanced Thermoelectric Power Factors. / Lehr, Gloria J.; Morelli, Donald T.; Jin, Hyungyu; Heremans, Joseph P.

In: Journal of Electronic Materials, Vol. 44, No. 6, 01.06.2015, p. 1663-1667.

Research output: Contribution to journalArticle

Lehr, Gloria J. ; Morelli, Donald T. ; Jin, Hyungyu ; Heremans, Joseph P./ YbCu2Si2–LaCu2Si2 Solid Solutions with Enhanced Thermoelectric Power Factors. In: Journal of Electronic Materials. 2015 ; Vol. 44, No. 6. pp. 1663-1667
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