Thermoelectric properties of Mg doped p-type BiCuSeO oxyselenides

Jing Li; Jiehe Sui; Celine Barreteau; David Berardan; Nita Dragoe; Wei Cai; Yanling Pei; Li Dong Zhao

doi:10.1016/j.jallcom.2012.10.160

Thermoelectric properties of Mg doped p-type BiCuSeO oxyselenides

Jing Li
, Jiehe Sui^*
, Celine Barreteau
, David Berardan
, Nita Dragoe
, Wei Cai
, Yanling Pei
, Li Dong Zhao

^*Corresponding author for this work

School of Materials Science and Engineering

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

164 Scopus citations

Abstract

We report on the effect of Mg doping on the thermoelectric properties of p-type BiCuSeO oxyselenide, with layer structure composed of conductive (Cu ₂Se₂)^2- layers alternately stacked with insulating (Bi₂O₂)²⁺ layers. The substitution of Bi³⁺ by Mg²⁺ leads to an enhancement of the electrical conductivity and a decrease of the thermal conductivity. Coupled to high Seebeck coefficients, ZT at 923 K is increased from 0.45 for pristine BiCuSeO to 0.67 for Bi_0.95Mg_0.05CuSeO. However, the efficiency of Mg doping in the insulating (Bi₂O₂)²⁺ layer is low, and this doping only leads to a limited increase of the hole carriers concentration. Therefore Mg doped BiCuSeO has relatively low electrical conductivity which makes its thermoelectric figure of merit much lower than that of Ca, Sr and Ba doped BiCuSeO.

Original language	English
Pages (from-to)	649-653
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	551
DOIs	https://doi.org/10.1016/j.jallcom.2012.10.160
State	Published - 25 Feb 2013

Keywords

BiCuSeO
Electrical conductivity
Seebeck coefficient
Thermal conductivity
Thermoelectric

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10.1016/j.jallcom.2012.10.160

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@article{c82b7ce41c454f2d98c3b555abba9036,

title = "Thermoelectric properties of Mg doped p-type BiCuSeO oxyselenides",

abstract = "We report on the effect of Mg doping on the thermoelectric properties of p-type BiCuSeO oxyselenide, with layer structure composed of conductive (Cu 2Se2)2- layers alternately stacked with insulating (Bi2O2)2+ layers. The substitution of Bi3+ by Mg2+ leads to an enhancement of the electrical conductivity and a decrease of the thermal conductivity. Coupled to high Seebeck coefficients, ZT at 923 K is increased from 0.45 for pristine BiCuSeO to 0.67 for Bi0.95Mg0.05CuSeO. However, the efficiency of Mg doping in the insulating (Bi2O2)2+ layer is low, and this doping only leads to a limited increase of the hole carriers concentration. Therefore Mg doped BiCuSeO has relatively low electrical conductivity which makes its thermoelectric figure of merit much lower than that of Ca, Sr and Ba doped BiCuSeO.",

keywords = "BiCuSeO, Electrical conductivity, Seebeck coefficient, Thermal conductivity, Thermoelectric",

author = "Jing Li and Jiehe Sui and Celine Barreteau and David Berardan and Nita Dragoe and Wei Cai and Yanling Pei and Zhao, \{Li Dong\}",

year = "2013",

month = feb,

day = "25",

doi = "10.1016/j.jallcom.2012.10.160",

language = "英语",

volume = "551",

pages = "649--653",

journal = "Journal of Alloys and Compounds",

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TY - JOUR

T1 - Thermoelectric properties of Mg doped p-type BiCuSeO oxyselenides

AU - Li, Jing

AU - Sui, Jiehe

AU - Barreteau, Celine

AU - Berardan, David

AU - Dragoe, Nita

AU - Cai, Wei

AU - Pei, Yanling

AU - Zhao, Li Dong

PY - 2013/2/25

Y1 - 2013/2/25

N2 - We report on the effect of Mg doping on the thermoelectric properties of p-type BiCuSeO oxyselenide, with layer structure composed of conductive (Cu 2Se2)2- layers alternately stacked with insulating (Bi2O2)2+ layers. The substitution of Bi3+ by Mg2+ leads to an enhancement of the electrical conductivity and a decrease of the thermal conductivity. Coupled to high Seebeck coefficients, ZT at 923 K is increased from 0.45 for pristine BiCuSeO to 0.67 for Bi0.95Mg0.05CuSeO. However, the efficiency of Mg doping in the insulating (Bi2O2)2+ layer is low, and this doping only leads to a limited increase of the hole carriers concentration. Therefore Mg doped BiCuSeO has relatively low electrical conductivity which makes its thermoelectric figure of merit much lower than that of Ca, Sr and Ba doped BiCuSeO.

AB - We report on the effect of Mg doping on the thermoelectric properties of p-type BiCuSeO oxyselenide, with layer structure composed of conductive (Cu 2Se2)2- layers alternately stacked with insulating (Bi2O2)2+ layers. The substitution of Bi3+ by Mg2+ leads to an enhancement of the electrical conductivity and a decrease of the thermal conductivity. Coupled to high Seebeck coefficients, ZT at 923 K is increased from 0.45 for pristine BiCuSeO to 0.67 for Bi0.95Mg0.05CuSeO. However, the efficiency of Mg doping in the insulating (Bi2O2)2+ layer is low, and this doping only leads to a limited increase of the hole carriers concentration. Therefore Mg doped BiCuSeO has relatively low electrical conductivity which makes its thermoelectric figure of merit much lower than that of Ca, Sr and Ba doped BiCuSeO.

KW - BiCuSeO

KW - Electrical conductivity

KW - Seebeck coefficient

KW - Thermal conductivity

KW - Thermoelectric

UR - https://www.scopus.com/pages/publications/84870988874

U2 - 10.1016/j.jallcom.2012.10.160

DO - 10.1016/j.jallcom.2012.10.160

M3 - 文章

AN - SCOPUS:84870988874

SN - 0925-8388

VL - 551

SP - 649

EP - 653

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Thermoelectric properties of Mg doped p-type BiCuSeO oxyselenides

Abstract

Keywords

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