Synthesis of self-ordered Sb2Te2 films with atomically aligned Te layers and the effect of phonon scattering modulation

Hyejin Choi, Ju Heyuck Baeck, Tae Hyeon Kim, Jae Yong Song, Sangwoo Shin, Hyunghee Cho, Dae Hong Ko, Jin Sang Kim, Kwang Ho Jeong, Mann Ho Cho

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In this work, we prepared multilayered films with repeated Sb and Te layers by a thermal evaporation method. The film structure was controlled by the layer thickness ratio of Sb to Te, resulting in the formation of self-ordered superlattice structured Sb2Te2/Te films and self-ordered Sb2Te3 films. The thermoelectrical properties and the thermoelectric figure of merit (ZT) closely correlated with the structural characteristics, i.e., the superlattice structure with semiconductor-semimetal layers contributed to both electron and phonon scattering resulting in an improvement in electrical conduction and an increase in phonon scattering. In particular, phonon scattering was significantly increased to further reduce thermal conductivity in the self-ordered superlattice structure of the {Sb 2Te2/Te}n sample. As a result, a thermoelectric figure of merit of ZT = 1.43 was obtained at 400 K for {Sb(4)Te(6)} n, indicating that the self-ordered superlattice structure holds great promise as an alternative layered thin film thermoelectric material.

Original languageEnglish
Pages (from-to)7043-7053
Number of pages11
JournalJournal of Materials Chemistry C
Volume1
Issue number42
DOIs
Publication statusPublished - 2013 Nov 14

Fingerprint

Phonon scattering
Modulation
Metalloids
Electron scattering
Thermal evaporation
Thermal conductivity
Semiconductor materials
Thin films

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

Choi, Hyejin ; Baeck, Ju Heyuck ; Kim, Tae Hyeon ; Song, Jae Yong ; Shin, Sangwoo ; Cho, Hyunghee ; Ko, Dae Hong ; Kim, Jin Sang ; Jeong, Kwang Ho ; Cho, Mann Ho. / Synthesis of self-ordered Sb2Te2 films with atomically aligned Te layers and the effect of phonon scattering modulation. In: Journal of Materials Chemistry C. 2013 ; Vol. 1, No. 42. pp. 7043-7053.
@article{bf7216c3a6024d43abb52b933e2f2287,
title = "Synthesis of self-ordered Sb2Te2 films with atomically aligned Te layers and the effect of phonon scattering modulation",
abstract = "In this work, we prepared multilayered films with repeated Sb and Te layers by a thermal evaporation method. The film structure was controlled by the layer thickness ratio of Sb to Te, resulting in the formation of self-ordered superlattice structured Sb2Te2/Te films and self-ordered Sb2Te3 films. The thermoelectrical properties and the thermoelectric figure of merit (ZT) closely correlated with the structural characteristics, i.e., the superlattice structure with semiconductor-semimetal layers contributed to both electron and phonon scattering resulting in an improvement in electrical conduction and an increase in phonon scattering. In particular, phonon scattering was significantly increased to further reduce thermal conductivity in the self-ordered superlattice structure of the {Sb 2Te2/Te}n sample. As a result, a thermoelectric figure of merit of ZT = 1.43 was obtained at 400 K for {Sb(4)Te(6)} n, indicating that the self-ordered superlattice structure holds great promise as an alternative layered thin film thermoelectric material.",
author = "Hyejin Choi and Baeck, {Ju Heyuck} and Kim, {Tae Hyeon} and Song, {Jae Yong} and Sangwoo Shin and Hyunghee Cho and Ko, {Dae Hong} and Kim, {Jin Sang} and Jeong, {Kwang Ho} and Cho, {Mann Ho}",
year = "2013",
month = "11",
day = "14",
doi = "10.1039/c3tc31215a",
language = "English",
volume = "1",
pages = "7043--7053",
journal = "Journal of Materials Chemistry C",
issn = "2050-7526",
publisher = "Royal Society of Chemistry",
number = "42",

}

Synthesis of self-ordered Sb2Te2 films with atomically aligned Te layers and the effect of phonon scattering modulation. / Choi, Hyejin; Baeck, Ju Heyuck; Kim, Tae Hyeon; Song, Jae Yong; Shin, Sangwoo; Cho, Hyunghee; Ko, Dae Hong; Kim, Jin Sang; Jeong, Kwang Ho; Cho, Mann Ho.

In: Journal of Materials Chemistry C, Vol. 1, No. 42, 14.11.2013, p. 7043-7053.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Synthesis of self-ordered Sb2Te2 films with atomically aligned Te layers and the effect of phonon scattering modulation

AU - Choi, Hyejin

AU - Baeck, Ju Heyuck

AU - Kim, Tae Hyeon

AU - Song, Jae Yong

AU - Shin, Sangwoo

AU - Cho, Hyunghee

AU - Ko, Dae Hong

AU - Kim, Jin Sang

AU - Jeong, Kwang Ho

AU - Cho, Mann Ho

PY - 2013/11/14

Y1 - 2013/11/14

N2 - In this work, we prepared multilayered films with repeated Sb and Te layers by a thermal evaporation method. The film structure was controlled by the layer thickness ratio of Sb to Te, resulting in the formation of self-ordered superlattice structured Sb2Te2/Te films and self-ordered Sb2Te3 films. The thermoelectrical properties and the thermoelectric figure of merit (ZT) closely correlated with the structural characteristics, i.e., the superlattice structure with semiconductor-semimetal layers contributed to both electron and phonon scattering resulting in an improvement in electrical conduction and an increase in phonon scattering. In particular, phonon scattering was significantly increased to further reduce thermal conductivity in the self-ordered superlattice structure of the {Sb 2Te2/Te}n sample. As a result, a thermoelectric figure of merit of ZT = 1.43 was obtained at 400 K for {Sb(4)Te(6)} n, indicating that the self-ordered superlattice structure holds great promise as an alternative layered thin film thermoelectric material.

AB - In this work, we prepared multilayered films with repeated Sb and Te layers by a thermal evaporation method. The film structure was controlled by the layer thickness ratio of Sb to Te, resulting in the formation of self-ordered superlattice structured Sb2Te2/Te films and self-ordered Sb2Te3 films. The thermoelectrical properties and the thermoelectric figure of merit (ZT) closely correlated with the structural characteristics, i.e., the superlattice structure with semiconductor-semimetal layers contributed to both electron and phonon scattering resulting in an improvement in electrical conduction and an increase in phonon scattering. In particular, phonon scattering was significantly increased to further reduce thermal conductivity in the self-ordered superlattice structure of the {Sb 2Te2/Te}n sample. As a result, a thermoelectric figure of merit of ZT = 1.43 was obtained at 400 K for {Sb(4)Te(6)} n, indicating that the self-ordered superlattice structure holds great promise as an alternative layered thin film thermoelectric material.

UR - http://www.scopus.com/inward/record.url?scp=84885442459&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84885442459&partnerID=8YFLogxK

U2 - 10.1039/c3tc31215a

DO - 10.1039/c3tc31215a

M3 - Article

AN - SCOPUS:84885442459

VL - 1

SP - 7043

EP - 7053

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

SN - 2050-7526

IS - 42

ER -