Recently, AgCuSe-based ductile inorganic thermoelectric (TE) materials have attracted great interests because they can simultaneously achieve excellent TE performance and good deformability at room temperature. The composition-performance relationship of p-type AgCuSe-based ductile inorganic TE materials have been systematically investigated, but the related investigation on n-type AgCuSe-based ductile inorganic TE materials is still absent. In this work, a series of n-type ductile AgCuSeS ( = −0.02, −0.01, 0, 0.01, and 0.02) samples are prepared. The effects of Ag off-stoichiometry on the phase composition, mechanical, and TE properties are systematically investigated. The crystal structure of AgCuSeS can accommodate a small amount of Ag-excess to maintain the phase purity, but very little Ag-deficiency can induce the formation of secondary phases. The Ag off-stoichiometry has little influence on the mechanical performance. Introducing Ag-excess can increase the carrier concentration to optimize the electrical conductivity and power factor, leading to enhanced TE figure-of-merit (). The of AgCuSeS is 0.17 at 300 K. The six-couple in-plane flexible TE device fabricated based on AgCuSeS demonstrates high output performance that is superior to the organic flexible TE devices. This work deepens the understanding on the novel AgCuSe-based ductile inorganic TE materials.

中文翻译：

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Ag非化学计量对延性AgCuSe0.6S0.4机械和热电性能的影响

近年来，AgCuSe基延展性无机热电（TE）材料引起了人们的极大兴趣，因为它们可以同时实现优异的TE性能和良好的室温变形能力。 p型AgCuSe基韧性无机TE材料的成分与性能关系已经得到系统研究，但n型AgCuSe基韧性无机TE材料的相关研究仍然缺乏。在这项工作中，制备了一系列 n 型延展性 AgCuSeS（= -0.02、-0.01、0、0.01 和 0.02）样品。系统地研究了 Ag 非化学计量对相组成、机械和 TE 性能的影响。 AgCuSeS的晶体结构可以容纳少量的Ag过量以保持相纯度，但极少量的Ag缺乏可以诱导第二相的形成。 Ag非化学计量对机械性能影响很小。引入过量的 Ag 可以增加载流子浓度，从而优化电导率和功率因数，从而提高 TE 品质因数 ()。 AgCuSeS在300 K时的值为0.17。基于AgCuSeS制造的六耦合面内柔性TE器件表现出优于有机柔性TE器件的高输出性能。这项工作加深了人们对新型 AgCuSe 基延性无机 TE 材料的理解。