多功能GeMnTe2协同优化SnTe-In2Te3合金的热电性能,ACS Applied Materials & Interfaces

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多功能GeMnTe2协同优化SnTe-In2Te3合金的热电性能
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-12-01 , DOI: 10.1021/acsami.3c13907
Ruiheng Li ₁ , Fujie Zhang ₁ , Wenxin Ou ₁ , Xiaobo Tan ₁ , Jianglong Zhu ₁ , Ding Ren ₁ , Ran Ang _{1,

2}

Affiliation

SnTe-In ₂ Te ₃合金由于谐振水平，确保在整个温度范围内具有优异的电性能。然而，温度敏感的共振态和单声子散射限制了热电性能的进一步提高。因此，预计应该引入额外的电独立散射源来阻止声子传输。这里，SnTe-In ₂ Te ₃ –GeMnTe ₂合金是通过进一步凝固立方GeMnTe ₂来制备的，其表现出多重调制效应。高度再溶解的Mn ²⁺促进了价带收敛，提高了较高温度下的塞贝克系数，并平衡了较高载流子浓度下可能减弱的谐振能级效应，并且具有较高的平均功率因数（1.94 mW m ^–1 K ^–2）在整个温度范围内实现。_{此外，GeMnTe 2}合金化很容易构建补偿空位、取代和 Ge/Mn 沉淀物，从而进一步降低晶格导热系数，在 850 K 时达到 κ _l ∼ 0.6 W m ^–1 K ^{–1 。 (SnTe)}_2.91 (In ₂ Te ₃ ) _0.03 (Ge _0.5 Mn _0.5 Te) _1.2实现了~1.25 (850 K) 的峰值zT和 0.72 (300–850 K) 的zT_平均值，并且实现了最大热电转换效率达到~2.8%（ΔT ~ 450 K）。目前的结果表明GeMnTe _{2在增强SnTe-In}₂ Te ₃合金的热电性能方面具有多种作用。

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Multifunctional GeMnTe2 Synergistically Optimizes Thermoelectric Properties of SnTe-In2Te3 Alloys

SnTe-In₂Te₃ alloys ensure excellent electrical properties in the whole temperature region due to the resonant level. Nevertheless, temperature-sensitive resonance states and single phonon scattering restrict further improvement of thermoelectric performance. Consequently, it is anticipated that additional electrically independent scattering sources should be introduced to impede phonon transport. Here, the SnTe-In₂Te₃–GeMnTe₂ alloy is prepared by further solidifying cubic GeMnTe₂, which demonstrates multiple modulation effects. The highly redissolved Mn²⁺ promotes the valence band convergence, enhances the Seebeck coefficient at higher temperature, and balances the possible weakened resonance level effect at higher carrier concentrations, and a high average power factor (1.94 mW m^–1 K^–2) is realized over the entire temperature range. Additionally, compensatory vacancies, substitutions, and Ge/Mn precipitates are easily constructed with GeMnTe₂ alloying, leading to a further reduction in lattice thermal conductivity, which reaches κ_l ∼ 0.6 W m^–1 K^–1 at 850 K. Ultimately, a high peak zT of ∼1.25 (850 K) and a zT_ave of 0.72 (300–850 K) are realized in (SnTe)_2.91(In₂Te₃)_0.03(Ge_0.5Mn_0.5Te)_1.2, and the maximum thermoelectric conversion efficiency of ∼2.8% (ΔT ∼ 450 K) is achieved. The present results indicate multiple effects of GeMnTe₂ in enhancing the thermoelectric performance of SnTe-In₂Te₃ alloys.

更新日期：2023-12-01

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