Homo-composition and hetero-structure nanocomposite Pnma Bi2SeS2 - Pnnm Bi2SeS2 with high thermoelectric performance

Bushra Jabar, Fu Li (), Zhuanghao Zheng, Adil Mansoor, Yongbin Zhu, Chongbin Liang, Dongwei Ao, Yuexing Chen, Guangxing Liang, Ping Fan () and Weishu Liu ()
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Bushra Jabar: Shenzhen University
Fu Li: Shenzhen University
Zhuanghao Zheng: Shenzhen University
Adil Mansoor: Beijing University of Technology
Yongbin Zhu: Southern University of Science and Technology
Chongbin Liang: Shenzhen University
Dongwei Ao: Shenzhen University
Yuexing Chen: Shenzhen University
Guangxing Liang: Shenzhen University
Ping Fan: Shenzhen University
Weishu Liu: Southern University of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Nanocomposite engineering decouples the transport of phonons and electrons. This usually involves the in-situ formation or ex-situ addition of nanoparticles to a material matrix with hetero-composition and hetero-structure (heC-heS) interfaces or hetero-composition and homo-structure (heC-hoS) interfaces. Herein, a quasi homo-composition and hetero-structure (hoC-heS) nanocomposite consisting of Pnma Bi2SeS2 - Pnnm Bi2SeS2 is obtained through a Br dopant-induced phase transition, providing a coherent interface between the Pnma matrix and Pnnm second phase due to the slight structural difference between the two phases. This hoC-heS nanocomposite demonstrates a significant reduction in lattice thermal conductivity (~0.40 W m−1 K−1) and an enhanced power factor (7.39 μW cm−1 K−2). Consequently, a record high figure-of-merit ZTmax = 1.12 (at 773 K) and a high average figure-of-merit ZTave = 0.72 (in the range of 323–773 K) are achieved. This work provides a general strategy for synergistically tuning electrical and thermal transport properties by designing hoC-heS nanocomposites through a dopant-induced phase transition.

Date: 2021
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DOI: 10.1038/s41467-021-27564-2

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