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

被引:43
作者
Jabar, Bushra [1 ]
Li, Fu [1 ]
Zheng, Zhuanghao [1 ]
Mansoor, Adil [2 ]
Zhu, Yongbin [3 ]
Liang, Chongbin [1 ]
Ao, Dongwei [1 ]
Chen, Yuexing [1 ]
Liang, Guangxing [1 ]
Fan, Ping [1 ]
Liu, Weishu [3 ,4 ]
机构
[1] Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen Key Lab Adv Thin Films & Applicat, Shenzhen 518060, Peoples R China
[2] Beijing Univ Technol, Fac Mat & Mfg, 100 Peenle Yuan, Beijing 100124, Peoples R China
[3] Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
[4] Southern Univ Sci & Technol, Guangdong Prov Key Lab Funct Oxide Mat & Devices, Shenzhen 518055, Peoples R China
基金
中国国家自然科学基金;
关键词
N-TYPE BI2S3; POWER; CONDUCTIVITY;
D O I
10.1038/s41467-021-27564-2
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 (similar to 0.40 W m(-1) K-1) and an enhanced power factor (7.39 mu W cm(-1) K-2). Consequently, a record high figure-of-merit ZT(max) =1.12 (at 773 K) and a high average figure-of-merit ZT(ave) = 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.
引用
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页数:11
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