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Title: Suppressing Ge-vacancies to achieve high single-leg efficiency in GeTe with an ultra-high room temperature power factor
Authors: Jia, Ning
Cao, Jing
Tan, Xian Yi
Zheng, Jie
Chien, Sheau Wei
Yang, Le
Chen, Kewei
Ng, Hong Kuan
Duran, Solco Samantha Faye
Liu, Hongfei
Tan, Ivan Chee Kiang
Li, Zibiao
Xu, Jianwei
Wu, Jing
Yan, Qingyu
Suwardi, Ady
Keywords: Engineering::Materials
Issue Date: 2021
Source: Jia, N., Cao, J., Tan, X. Y., Zheng, J., Chien, S. W., Yang, L., Chen, K., Ng, H. K., Duran, S. S. F., Liu, H., Tan, I. C. K., Li, Z., Xu, J., Wu, J., Yan, Q. & Suwardi, A. (2021). Suppressing Ge-vacancies to achieve high single-leg efficiency in GeTe with an ultra-high room temperature power factor. Journal of Materials Chemistry A, 9(41), 23335-23344.
Project: A19D9a0096
Journal: Journal of Materials Chemistry A
Abstract: GeTe is among the best medium-temperature thermoelectrics. Its high performance originates from band convergence at the phase transition and low lattice thermal conductivity due to Peierls distortion. In most studies, the peak performance (zT) in GeTe is achieved by designing and optimizing its electronic and thermal transport properties near its phase transition temperature (700 K). However, for efficient power harvesting, a high average zT (zT(ave)) across a wide temperature range is desirable. This calls for a holistic performance evaluation and enhancement not only near 700 K, but also at room temperature. In this work, we leveraged on the confluence of performance enhancement strategies via Cu2Te alloying and In resonant doping to achieve a record-high room temperature power factor of 2800 mu W mK-2, and an average power factor of 3700 mu W mK-2 between 323 and 773 K. The magnitude of the room temperature power factor is comparable to that of the state-of-the-art Bi2Te3 based compounds. In the optimized sample with Bi doping, a room temperature zT of 0.5 is achieved, highest for lead-free GeTe. Ultimately, a high peak zT of 2.1 at 723 K and single leg power conversion efficiency of 11.8% were achieved between 323 and 745 K, which are among the highest reported for lead-free GeTe.
ISSN: 2050-7488
DOI: 10.1039/D1TA05866E
Schools: School of Materials Science and Engineering 
School of Mechanical and Aerospace Engineering 
Organisations: Institute of Materials Research and Engineering, A*STAR
Rights: © 2021 The Royal Society of Chemistry. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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