气候变化领域集成服务门户(CCPortal): Synergistically optimizing interdependent thermoelectric parameters of n-type PbSe through alloying CdSe

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DOI	10.1039/c8ee03386b
	Synergistically optimizing interdependent thermoelectric parameters of n-type PbSe through alloying CdSe
	Qian X.; Wu H.; Wang D.; Zhang Y.; Wang J.; Wang G.; Zheng L.; Pennycook S.J.; Zhao L.-D.
发表日期	2019
ISSN	1754-5692
起始页码	1969
结束页码	1978
卷号	12 期号:6
英文摘要	PbSe is an alternative of the well-known moderate-temperature thermoelectric material PbTe, and has attracted much attention because of its advantages of high earth-abundance and low price of Se compared with Te. To enhance the thermoelectric performance of PbSe, its several shortcomings should be overcome, such as poor electrical conductivity, small Seebeck coefficient and bipolar thermal conductivity. Simultaneously improving these properties is a big challenge in the thermoelectric community. In this work, we successfully addressed these problems with PbSe by introducing just one component, CdSe, which has a similar crystal structure and larger band gap compared to PbSe. The introduction of CdSe realizes four positive effects: (1) improving the effective mass through flattening the conduction band; (2) decreasing the lattice thermal conductivity enormously by introducing hierarchical sub-nano defects; (3) keeping a high carrier mobility due to the nanostructure-free matrix; (4) suppressing the bipolar thermal conductivity via enlarging the band gap of PbSe. Due to all the above synergistically optimized electrical and thermal transport properties, a superior ZT value of ∼1.4 and ZTave of ∼0.7 are achieved in n-type PbSe through CdSe alloying, and the calculated conversion efficiency can reach 10.5%. Our results indicate that PbSe is a robust candidate for medium-temperature thermoelectric applications. © 2019 The Royal Society of Chemistry.
语种	英语
scopus关键词	Alloying; Cadmium alloys; Cadmium compounds; Crystal structure; Energy gap; II-VI semiconductors; IV-VI semiconductors; Thermal conductivity; Thermoelectricity; Electrical conductivity; High carrier mobility; Lattice thermal conductivity; Thermal transport properties; Thermo-Electric materials; Thermoelectric application; Thermoelectric parameters; Thermoelectric performance; Lead alloys; crystal structure; electrical property; optimization; parameter estimation; thermal conductivity
来源期刊	Energy and Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162724
作者单位	School of Materials Science and Engineering, Beihang University, Beijing, 100191, China; Department of Materials Science and Engineering, National University of Singapore, 7 Engineering Drive 1, Singapore, 117575, Singapore; College of Physics and Materials Science, Henan Normal University, Xinxiang, 453007, China
推荐引用方式 GB/T 7714	Qian X.,Wu H.,Wang D.,et al. Synergistically optimizing interdependent thermoelectric parameters of n-type PbSe through alloying CdSe[J],2019,12(6).
APA	Qian X..,Wu H..,Wang D..,Zhang Y..,Wang J..,...&Zhao L.-D..(2019).Synergistically optimizing interdependent thermoelectric parameters of n-type PbSe through alloying CdSe.Energy and Environmental Science,12(6).
MLA	Qian X.,et al."Synergistically optimizing interdependent thermoelectric parameters of n-type PbSe through alloying CdSe".Energy and Environmental Science 12.6(2019).