Experimental evidence of enhancement of thermoelectric properties in tellurium nanoparticle-embedded bismuth antimony telluride

Sang Il Kim, Sungwoo Hwang, Jong Wook Roh, Kyunghan Ahn, Dong Hee Yeon, Kyu Hyoung Lee, Sung Wng Kim

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We present experimental evidence of enhancement of thermoelectric properties in tellurium (Te) nanoparticle-embedded bismuth antimony telluride (BiSbTe) alloys. Bi0.5Sb1.5Te3 films with a high density of Te particles of 10-20 nm size were prepared by growth of alternating multilayers of ultrathin Te and Bi0.5Sb 1.5Te3. As the amount of Te nanoinclusions increased up to ∼15%, the Seebeck coefficient and thermoelectric power factor were increased. Based on the concept of band bending at heterointerfaces as a carrier energy filter, the energy relaxation calculation was made to confirm that the Te nanoinclusions result in a carrier energy filtering effect in p-type bismuth antimony telluride. In addition, thermal conductivities were reduced in the Te-embedded samples, permitting possible further enhancement of the thermoelectric figure of merit. The advantages of Te nanoinclusions in p-type Bi0.5Sb1.5Te3 alloys on thermoelectric performance are experimentally realized by both electron- and phonon scattering.

Original languageEnglish
Pages (from-to)2449-2456
Number of pages8
JournalJournal of Materials Research
Volume27
Issue number19
DOIs
Publication statusPublished - 2012 Oct 14

Fingerprint

Tellurium
Antimony
Bismuth
tellurides
tellurium
antimony
bismuth
Nanoparticles
nanoparticles
augmentation
Phonon scattering
Electron scattering
Seebeck coefficient
Thermoelectric power
Seebeck effect
figure of merit
energy
Thermal conductivity
Multilayers
thermal conductivity

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Kim, Sang Il ; Hwang, Sungwoo ; Roh, Jong Wook ; Ahn, Kyunghan ; Yeon, Dong Hee ; Lee, Kyu Hyoung ; Kim, Sung Wng. / Experimental evidence of enhancement of thermoelectric properties in tellurium nanoparticle-embedded bismuth antimony telluride. In: Journal of Materials Research. 2012 ; Vol. 27, No. 19. pp. 2449-2456.
@article{60439bc8eb924a88bb138166e9bf0b82,
title = "Experimental evidence of enhancement of thermoelectric properties in tellurium nanoparticle-embedded bismuth antimony telluride",
abstract = "We present experimental evidence of enhancement of thermoelectric properties in tellurium (Te) nanoparticle-embedded bismuth antimony telluride (BiSbTe) alloys. Bi0.5Sb1.5Te3 films with a high density of Te particles of 10-20 nm size were prepared by growth of alternating multilayers of ultrathin Te and Bi0.5Sb 1.5Te3. As the amount of Te nanoinclusions increased up to ∼15{\%}, the Seebeck coefficient and thermoelectric power factor were increased. Based on the concept of band bending at heterointerfaces as a carrier energy filter, the energy relaxation calculation was made to confirm that the Te nanoinclusions result in a carrier energy filtering effect in p-type bismuth antimony telluride. In addition, thermal conductivities were reduced in the Te-embedded samples, permitting possible further enhancement of the thermoelectric figure of merit. The advantages of Te nanoinclusions in p-type Bi0.5Sb1.5Te3 alloys on thermoelectric performance are experimentally realized by both electron- and phonon scattering.",
author = "Kim, {Sang Il} and Sungwoo Hwang and Roh, {Jong Wook} and Kyunghan Ahn and Yeon, {Dong Hee} and Lee, {Kyu Hyoung} and Kim, {Sung Wng}",
year = "2012",
month = "10",
day = "14",
doi = "10.1557/jmr.2012.273",
language = "English",
volume = "27",
pages = "2449--2456",
journal = "Journal of Materials Research",
issn = "0884-2914",
publisher = "Materials Research Society",
number = "19",

}

Experimental evidence of enhancement of thermoelectric properties in tellurium nanoparticle-embedded bismuth antimony telluride. / Kim, Sang Il; Hwang, Sungwoo; Roh, Jong Wook; Ahn, Kyunghan; Yeon, Dong Hee; Lee, Kyu Hyoung; Kim, Sung Wng.

In: Journal of Materials Research, Vol. 27, No. 19, 14.10.2012, p. 2449-2456.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Experimental evidence of enhancement of thermoelectric properties in tellurium nanoparticle-embedded bismuth antimony telluride

AU - Kim, Sang Il

AU - Hwang, Sungwoo

AU - Roh, Jong Wook

AU - Ahn, Kyunghan

AU - Yeon, Dong Hee

AU - Lee, Kyu Hyoung

AU - Kim, Sung Wng

PY - 2012/10/14

Y1 - 2012/10/14

N2 - We present experimental evidence of enhancement of thermoelectric properties in tellurium (Te) nanoparticle-embedded bismuth antimony telluride (BiSbTe) alloys. Bi0.5Sb1.5Te3 films with a high density of Te particles of 10-20 nm size were prepared by growth of alternating multilayers of ultrathin Te and Bi0.5Sb 1.5Te3. As the amount of Te nanoinclusions increased up to ∼15%, the Seebeck coefficient and thermoelectric power factor were increased. Based on the concept of band bending at heterointerfaces as a carrier energy filter, the energy relaxation calculation was made to confirm that the Te nanoinclusions result in a carrier energy filtering effect in p-type bismuth antimony telluride. In addition, thermal conductivities were reduced in the Te-embedded samples, permitting possible further enhancement of the thermoelectric figure of merit. The advantages of Te nanoinclusions in p-type Bi0.5Sb1.5Te3 alloys on thermoelectric performance are experimentally realized by both electron- and phonon scattering.

AB - We present experimental evidence of enhancement of thermoelectric properties in tellurium (Te) nanoparticle-embedded bismuth antimony telluride (BiSbTe) alloys. Bi0.5Sb1.5Te3 films with a high density of Te particles of 10-20 nm size were prepared by growth of alternating multilayers of ultrathin Te and Bi0.5Sb 1.5Te3. As the amount of Te nanoinclusions increased up to ∼15%, the Seebeck coefficient and thermoelectric power factor were increased. Based on the concept of band bending at heterointerfaces as a carrier energy filter, the energy relaxation calculation was made to confirm that the Te nanoinclusions result in a carrier energy filtering effect in p-type bismuth antimony telluride. In addition, thermal conductivities were reduced in the Te-embedded samples, permitting possible further enhancement of the thermoelectric figure of merit. The advantages of Te nanoinclusions in p-type Bi0.5Sb1.5Te3 alloys on thermoelectric performance are experimentally realized by both electron- and phonon scattering.

UR - http://www.scopus.com/inward/record.url?scp=84870266103&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84870266103&partnerID=8YFLogxK

U2 - 10.1557/jmr.2012.273

DO - 10.1557/jmr.2012.273

M3 - Article

AN - SCOPUS:84870266103

VL - 27

SP - 2449

EP - 2456

JO - Journal of Materials Research

JF - Journal of Materials Research

SN - 0884-2914

IS - 19

ER -