NDLI: Enhanced thermoelectric properties of Bi2(Te1−xSex)3-based compounds as n-type legs for low-temperature power generation

Content Provider	Royal Society of Chemistry (RSC)
Author	Yang, Jihui Tan, Gangjian Li, Han Wang, Shanyu Tang, Xinfeng Xie, Wenjie Zheng, Gang
Copyright Year	2012
Abstract	The abundance of low-temperature waste heat necessitates the development of reliable and scalable thermal-to-electric energy conversion technology. The thermoelectric device is one viable option. Commercially available Bi2Te3-based materials are optimized for near room temperature cooling applications. Currently there are no mass-produced materials available for 400 K to 650 K thermoelectric power generation. We report the successful realization of high performance n-type Bi2(Te1−xSex)3-based materials for the temperature range of interest, using a commercial zone-melting technique. The introduction of Se effectively increases the band gap, which significantly suppresses the “turn-over” in Seebeck coefficient and the appearance of a pronounced bipolar effect, shifting the corresponding temperature of the optimum thermoelectric figure of merit ZT towards a higher temperature range. Furthermore, we demonstrate that the electron concentration of Bi2(Te0.5Se0.5)3 can be effectively adjusted by iodine doping. The samples with electron concentrations between 3 × 1019 and 4.5 × 1019 cm−3 display optimal thermoelectric performances. The highest ZT value reaches 0.86 at 600 K for the sample with the electron concentration of 4.0 × 1019 cm−3, whose average ZT between 400 K and 640 K is 0.8, making this scalable zone-melted low-Te content Bi2(Te0.5Se0.5)3 compound a promising candidate for low-temperature power generation.
Starting Page	20943
Ending Page	20951
Page Count	9
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	39
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm34608g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Seebeck Waste heat Thermoelectric effect Extrinsic semiconductor Band gap Seebeck coefficient Bipolar junction transistor Iodine Dopant The Samples
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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