Ternary compound CuSbSe₂-alloyed PbTe, Cu_mPb₁₀₀Sb_mTe₁₀₀Se_2m (CLAST), presents outstanding n-type thermoelectric transport behavior and features hierarchical Cu-based precipitates and interstitials that can balance phonon and carrier transport. Results show that a small amount of CuSbSe₂ (∼3%) alloying in CLAST can realize a room-temperature carrier concentration of ∼1.7 × 10¹⁸ cm⁻³ and then optimize the power factor, and simultaneously precipitate out embedded Cu-based nanostructures in the matrix to lower the lattice thermal conductivity. Additionally, extra Cu atoms adding in CLAST can form interstitials and further improve both the carrier concentration to ∼3.0 × 10¹⁸ cm⁻³ and carrier mobility to ∼1227.8 cm² V⁻¹ s⁻¹ at room temperature, which benefits a maximum power factor of ∼20.0 μW cm⁻¹ K⁻² in Cu_3.3Pb₁₀₀Sb₃Te₁₀₀Se₆. Moreover, the Cu interstitials together with massive Cu-based nanoprecipitates can strongly scatter a wide set of phonons, and largely lower the lattice thermal conductivity to ∼0.44 W m⁻¹ K⁻¹ in Cu_3.4Pb₁₀₀Sb₃Te₁₀₀Se₆ at 623 K. Finally, these Cu-based hierarchical structures in CLAST samples can synergistically optimize the phonon and carrier transport properties and contribute to a high ZT of ∼0.5 at 300 K and a peak ZT of ∼1.4 at 723 K. A remarkably high ZT_ave of ∼0.94 at 300–723 K is achieved in Cu_3.3Pb₁₀₀Sb₃Te₁₀₀Se₆ due to high ZT values in the low temperature range, outperforming other high-performance n-type PbTe-based thermoelectric materials.

中文翻译：

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分层结构导致Cum + nPb100SbmTe100Se2m（CLAST）具有较高的热电性能

三元复合CuSbSe ₂合金PbTe，Cu _m Pb ₁₀₀ Sb _m Te ₁₀₀ Se _{2 m}（CLAST），具有出色的n型热电传输性能，并具有能平衡声子和载流子传输的基于Cu的分层析出物和间隙。结果表明，在CLAST中少量CuSbSe ₂（〜3 ％）合金化可实现室温载流子浓度为1.7×10 ¹⁸ cm ^-3。然后优化功率因数，同时在基质中沉淀出嵌入的Cu基纳米结构，以降低晶格热导率。此外，在CLAST中添加多余的Cu原子可以形成间隙，并进一步将载流子浓度提高到约3.0×10 ¹⁸ cm ^-3，并且在室温下将载流子迁移率提高到约1227.8 cm ² V ^-1 s ^-1，这有利于获得最大功率。Cu _3.3 Pb ₁₀₀ Sb ₃ Te ₁₀₀ Se _6中的系数约为20.0μWcm ^-1 K ^-2。此外，Cu间隙与大量的基于Cu的纳米沉淀物一起可以强烈地散射大量声子，并在Cu _3.4 Pb ₁₀₀ Sb ₃ Te ₁₀₀ Se ₆中将晶格热导率大大降低至〜0.44 W m ^-1 K ^-1。 623 K.最后，碎屑样品中这些铜基层次结构可以协同优化声子和载流子传输性能和有助于高ZT的〜0.5在300K和峰值ZT在723 K. A的〜1.4显着高的ZT Cu _3.3 Pb ₁₀₀ Sb在300-723 K时_ave约为0.94₃ Te ₁₀₀ Se ₆由于在低温范围内具有较高的ZT值，因此优于其他高性能n型基于PbTe的热电材料。