Yajing Wang, Chao Wang, Xinxin Wang, Shengqiang Cui, Min Hao, Chunhui Wang, Xudong Huang and Gui Yang
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引用次数: 0
摘要
多晶硒化锡以其环境可持续性而闻名,有望成为一种重要的热电材料,吸引了大量研究人员的关注。本研究的重点是掺杂了碲化银(AgCuTe)的 p 型多晶 SnSe 的热电特性。我们的实验结果确凿地表明,AgCuTe 的分解产物不仅填补了 Sn 的空位,而且还充当了受体,从而引入了额外的空穴载流子。这显著提高了载流子的迁移率和浓度。重要的是,掺杂样品的热导率基本保持不变,因为晶格扁平化策略在不影响晶格热导率的情况下显著提高了电性能。最终,掺杂样品 Sn0.97Se-0.5%AgCuTe 的功率因数达到 6.2 mW mK-1,798 K 时的 ZT 峰值为 1.4,ZT 值提高了 109%。所有样品都表现出卓越的稳定性和可重复性,突出了其在实际应用中的可靠性。
Enhanced thermoelectric performance of AgCuTe-doped polycrystalline SnSe by lattice plainification
Polycrystalline SnSe, renowned for its environmental sustainability, holds promise as a significant thermoelectric material, attracting considerable research attention. This study focuses on the thermoelectric properties of p-type polycrystalline SnSe doped with silver copper telluride (AgCuTe). Our experimental results conclusively show that the decomposition products of AgCuTe not only fill Sn vacancies but also act as acceptors, thereby introducing additional hole carriers. This leads to a notable improvement in both carrier mobility and concentration. Importantly, the thermal conductivity of the doped samples remains largely unchanged, as the lattice flattening strategy significantly boosts electrical performance without affecting lattice thermal conductivity. Ultimately, the doped sample Sn0.97Se-0.5%AgCuTe resulted in a power factor of 6.2 mW mK−1 and a peak ZT value of 1.4 at 798 K, representing a 109% improvement in ZT value. All samples exhibits superior stability and reproducibility, emphasizing its reliability for practical applications.
期刊介绍:
This journal is concerned with all aspects of applied physics research, from biophysics, magnetism, plasmas and semiconductors to the structure and properties of matter.