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Weighted Mobility Ratio Engineering for High-Performance Bi–Te-Based Thermoelectric Materials via Suppression of Minority Carrier Transport

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Title
Weighted Mobility Ratio Engineering for High-Performance Bi–Te-Based Thermoelectric Materials via Suppression of Minority Carrier Transport
Author(s)
Kim, Minyoung; Kim, Sang-il; Sung Wng Kim; Kim, Hyun-Sik; Lee, Kyu Hyoung
Publication Date
2021-03
Journal
Advanced Materials
Publisher
John Wiley and Sons Inc
Abstract
© 2021 Wiley-VCH GmbHThermoelectrics, which can generate electricity from a temperature difference, or vice versa, is a key technology for solid-state cooling and energy harvesting; however, its applications are constrained owing to low efficiency. Since the conversion efficiency of thermoelectric devices is directly obtained via a figure of merit of materials, zT, which is related to the electronic and thermal transport characteristics, the aim here is to elucidate physical parameters that should be considered to understand transport phenomena in semiconducting materials. It is found that the weighted mobility ratio of the majority and minority carrier bands is an important parameter that determines zT. For nanograined Bi–Sb–Te alloy, the unremarked role of this parameter on temperature-dependent electronic transport properties is demonstrated. This analysis shows that the control of the weighted mobility ratio is a promising way to enhance zT of narrow bandgap thermoelectric materials.
URI
https://pr.ibs.re.kr/handle/8788114/9635
DOI
10.1002/adma.202005931
ISSN
0935-9648
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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