Grain boundary re-crystallization and sub-nano regions leading to high plateau figure of merit for Bi2Te3 nanoflakes

Energy Environ. Sci., 2023, Advance Article
DOI: 10.1039/D3EE02370B, Paper
Wei-Di Liu, Liang-Cao Yin, Lei Li, Qishuo Yang, De-Zhuang Wang, Meng Li, Xiao-Lei Shi, Qingfeng Liu, Yang Bai, Ian Gentle, Lianzhou Wang, Zhi-Gang Chen
Solvothermally synthesized Bi2Te3 nanoflakes can re-crystallize preferentially at the grain boundaries to form sub-nano boundary regions with a width <2 nm leading to a wide plateau figure of merit (zT) of >1.2 (from ∼323 to ∼423 K).
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