TY - JOUR
T1 - Enhanced thermoelectric properties of Bi2O2Se by Bi2Te2.7Se0.3 addition
AU - Song, Chunchun
AU - Zhou, Haitao
AU - Gu, Yan
AU - Pan, Lin
AU - Chen, Changchun
AU - Wang, Yifeng
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/1/5
Y1 - 2023/1/5
N2 - In this work, the thermoelectric properties of Bi2O2Se by Bi2Te2.7Se0.3 addition through liquid assisted shear exfoliation- restacking (LASE-R) process were studied. The results show that the Bi2Te2.7Se0.3 can alloy with Bi2O2Se and reduce the band gap, which introduce more electrons and improve the electrical conductivity of Bi2O2Se. Moreover, Bi2Te2.7Se0.3 addition act as a liquid phase sintering aids here, which can promote crystal growth and increase the sintering density of Bi2O2Se. Owing to the offset effect between |S| and σ, the absolute Seebeck coefficient |S| of all samples drops first and then rises with the increase of Bi2Te2.7Se0.3 content. Thus, the power factor is effectively improved. In addition, the lattice thermal conductivity is also suppressed to the nearly minimum theoretical limit, which should be attributed to the enhanced phonon-scattering by alloying. Therefore, a high figure of merit of 0.7 at 772 K was achieved for Bi2O2Se- 0.3 mol% Bi2Te2.7Se0.3.
AB - In this work, the thermoelectric properties of Bi2O2Se by Bi2Te2.7Se0.3 addition through liquid assisted shear exfoliation- restacking (LASE-R) process were studied. The results show that the Bi2Te2.7Se0.3 can alloy with Bi2O2Se and reduce the band gap, which introduce more electrons and improve the electrical conductivity of Bi2O2Se. Moreover, Bi2Te2.7Se0.3 addition act as a liquid phase sintering aids here, which can promote crystal growth and increase the sintering density of Bi2O2Se. Owing to the offset effect between |S| and σ, the absolute Seebeck coefficient |S| of all samples drops first and then rises with the increase of Bi2Te2.7Se0.3 content. Thus, the power factor is effectively improved. In addition, the lattice thermal conductivity is also suppressed to the nearly minimum theoretical limit, which should be attributed to the enhanced phonon-scattering by alloying. Therefore, a high figure of merit of 0.7 at 772 K was achieved for Bi2O2Se- 0.3 mol% Bi2Te2.7Se0.3.
KW - Alloying
KW - BiOSe
KW - Liquid phase sintering
KW - Thermoelectric
UR - http://www.scopus.com/inward/record.url?scp=85139354564&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2022.167439
DO - 10.1016/j.jallcom.2022.167439
M3 - 文章
AN - SCOPUS:85139354564
SN - 0925-8388
VL - 930
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 167439
ER -
