n-type thermoelectric material Mg2Sn0.75Ge0.25 for high power generation

Weishu Liu, Hee Seok Kim, Shuo Chen, Qing Jie, Bing Lv, Mengliang Yao, Zhensong Ren, Cyril P. Opeil, Stephen Wilson, Ching Wu Chu, Zhifeng Ren

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156 Citations (Scopus)


Thermoelectric power generation is one of the most promising techniques to use the huge amount of waste heat and solar energy. Traditionally, high thermoelectric figure-of-merit, ZT, has been the only parameter pursued for high conversion efficiency. Here, we emphasize that a high power factor (PF) is equivalently important for high power generation, in addition to high efficiency. A new n-type Mg2Sn-based material, Mg2Sn0.75Ge0.25, is a good example to meet the dual requirements in efficiency and output power. It was found that Mg2Sn0.75Ge0.25 has an average ZT of 0.9 and PF of 52 μW·cm-1·K-2 over the temperature range of 25-450 °C, a peak ZT of 1.4 at 450 °C, and peak PF of 55 μW·cm-1·K-2 at 350 °C. By using the energy balance of one-dimensional heat flow equation, leg efficiency and output power were calculated with Th = 400 °C and Tc = 50 °C to be of 10.5% and 6.6 W·cm-2 under a temperature gradient of 150 °C·mm-1, respectively.

Original languageEnglish
Pages (from-to)3269-3274
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number11
Publication statusPublished - 2015 Mar 17

All Science Journal Classification (ASJC) codes

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