Tailoring the Carrier and Phonon Scattering to Enhanced Thermoelectric Performance of SnTe by Cation-Anion Codoping with Eco-Benign CaI2

Sihui Li; Junyou Yang; Jiwu Xin; Qinghui Jiang; Zhiwei Zhou; Huishan Hu; Bingyang Sun; Abdul Basit; Xin Li

doi:10.1021/acsaem.8b02096

Tailoring the Carrier and Phonon Scattering to Enhanced Thermoelectric Performance of SnTe by Cation-Anion Codoping with Eco-Benign CaI₂

Sihui Li
, Junyou Yang^*
, Jiwu Xin
, Qinghui Jiang
, Zhiwei Zhou
, Huishan Hu
, Bingyang Sun
, Abdul Basit
, Xin Li

^*Corresponding author for this work

Interdisciplinary Research Center for Sustainable Energy Systems

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

In this work, earth abundant CaI₂ compound has been applied to regulate the thermoelectric performance of SnTe by codoping in both the anion and cation sites for the first time. The carrier concentration has been effectively tuned to a reasonable range due to the electron donor nature of I_Te⁺ point defects; on the other hand, the Seebeck coefficient has been significantly enhanced because of the resulted valence band convergence and band gap enlargement. More importantly, the phonon and carrier scattering have been tailored tactically, and a relatively high power factor with a significantly lowered thermal conductivity have been achieved simultaneously. In consequence, an enhanced figure of merit ZT ∼1.2 at 873 K was attained in the SnTe-3% CaI₂ sample.

Original language	English
Pages (from-to)	1997-2003
Number of pages	7
Journal	ACS Applied Energy Materials
Volume	2
Issue number	3
DOIs	https://doi.org/10.1021/acsaem.8b02096
State	Published - 25 Mar 2019

Bibliographical note

Publisher Copyright:
© 2019 American Chemical Society.

Keywords

band convergence
calcium iodide
carrier and phonon scattering
dislocations
thermoelectrics
tin telluride

ASJC Scopus subject areas

Chemical Engineering (miscellaneous)
Energy Engineering and Power Technology
Electrochemistry
Materials Chemistry
Electrical and Electronic Engineering

Access to Document

10.1021/acsaem.8b02096

Cite this

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title = "Tailoring the Carrier and Phonon Scattering to Enhanced Thermoelectric Performance of SnTe by Cation-Anion Codoping with Eco-Benign CaI2",

abstract = "In this work, earth abundant CaI2 compound has been applied to regulate the thermoelectric performance of SnTe by codoping in both the anion and cation sites for the first time. The carrier concentration has been effectively tuned to a reasonable range due to the electron donor nature of ITe+ point defects; on the other hand, the Seebeck coefficient has been significantly enhanced because of the resulted valence band convergence and band gap enlargement. More importantly, the phonon and carrier scattering have been tailored tactically, and a relatively high power factor with a significantly lowered thermal conductivity have been achieved simultaneously. In consequence, an enhanced figure of merit ZT ∼1.2 at 873 K was attained in the SnTe-3\% CaI2 sample.",

keywords = "band convergence, calcium iodide, carrier and phonon scattering, dislocations, thermoelectrics, tin telluride",

author = "Sihui Li and Junyou Yang and Jiwu Xin and Qinghui Jiang and Zhiwei Zhou and Huishan Hu and Bingyang Sun and Abdul Basit and Xin Li",

note = "Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",

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T1 - Tailoring the Carrier and Phonon Scattering to Enhanced Thermoelectric Performance of SnTe by Cation-Anion Codoping with Eco-Benign CaI2

AU - Li, Sihui

AU - Yang, Junyou

AU - Xin, Jiwu

AU - Jiang, Qinghui

AU - Zhou, Zhiwei

AU - Hu, Huishan

AU - Sun, Bingyang

AU - Basit, Abdul

AU - Li, Xin

PY - 2019/3/25

Y1 - 2019/3/25

N2 - In this work, earth abundant CaI2 compound has been applied to regulate the thermoelectric performance of SnTe by codoping in both the anion and cation sites for the first time. The carrier concentration has been effectively tuned to a reasonable range due to the electron donor nature of ITe+ point defects; on the other hand, the Seebeck coefficient has been significantly enhanced because of the resulted valence band convergence and band gap enlargement. More importantly, the phonon and carrier scattering have been tailored tactically, and a relatively high power factor with a significantly lowered thermal conductivity have been achieved simultaneously. In consequence, an enhanced figure of merit ZT ∼1.2 at 873 K was attained in the SnTe-3% CaI2 sample.

AB - In this work, earth abundant CaI2 compound has been applied to regulate the thermoelectric performance of SnTe by codoping in both the anion and cation sites for the first time. The carrier concentration has been effectively tuned to a reasonable range due to the electron donor nature of ITe+ point defects; on the other hand, the Seebeck coefficient has been significantly enhanced because of the resulted valence band convergence and band gap enlargement. More importantly, the phonon and carrier scattering have been tailored tactically, and a relatively high power factor with a significantly lowered thermal conductivity have been achieved simultaneously. In consequence, an enhanced figure of merit ZT ∼1.2 at 873 K was attained in the SnTe-3% CaI2 sample.

KW - band convergence

KW - calcium iodide

KW - carrier and phonon scattering

KW - dislocations

KW - thermoelectrics

KW - tin telluride

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