Enhanced thermoelectric performance of hot-pressed n-type Ag2Se nanostructures by controlling the intrinsic lattice defects,CrystEngComm

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Enhanced thermoelectric performance of hot-pressed n-type Ag2Se nanostructures by controlling the intrinsic lattice defects
CrystEngComm ( IF 2.6 ) Pub Date : 2023-05-19 , DOI: 10.1039/d3ce00066d
R. Santhosh ₁ , S. Harish _{1,

2} , R. Abinaya ₁ , S. Ponnusamy ₁ , H. Ikeda ₂ , J. Archana ₁ , M. Navaneethan _{1,

3}

Affiliation

Ag₂Se is a promising thermoelectric (TE) material for room-temperature (RT) applications owing to its excellent TE properties. In this work, we prepared Ag-deficient Ag₂Se using a hydrothermal method, and a hot-press densification process. The effect of TE properties was scientifically investigated. The calculated density of states (DOS) effective mass (m*) increased on increasing the Ag content, which must also be a reason for the enhanced maximum zT of 0.43 at 393 K for Ag_1.99Se. Moreover, complex nanostructures, including grain boundaries, nanograins, and lattice distortions, were obtained in Ag_2−xSe. Thus, the nanostructures strengthened the phonon scattering that leads to reduction in the total thermal conductivity (κ) in the range of 0.9–1.1 W m⁻¹ K⁻¹ in Ag_2−xSe at 303 K. The aim of our work was to increase the TE performance of Ag_2−xSe as a promising candidate for room temperature (RT) thermoelectric applications.

中文翻译：

通过控制本征晶格缺陷增强热压 n 型 Ag2Se 纳米结构的热电性能

Ag ₂ Se 由于其出色的 TE 特性，是一种很有前途的用于室温 (RT) 应用的热电 (TE) 材料。在这项工作中，我们使用水热法和热压致密化工艺制备了缺银 Ag _{2 Se。}对 TE 特性的影响进行了科学调查。计算出的态密度 (DOS) 有效质量 ( m *) 随着 Ag 含量的增加而增加，这也是Ag _1.99 Se在 393 K 时最大zT增强为 0.43 的原因。_{此外，在 Ag 2−}_x中获得了复杂的纳米结构，包括晶界、纳米晶粒和晶格畸变硒。因此，纳米结构加强了声子散射，导致总热导率 ( κ ) 在 303 K 时Ag ₂₋_x^{Se 的 0.9–1.1 W m −1} K ⁻¹范围内降低。我们工作的目的是提高 Ag ₂₋_x Se 的 TE 性能，作为室温 (RT) 热电应用的有前途的候选者。

更新日期：2023-05-19

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