Thermoelectric materials have obtained worldwide attention as they are attractive for waste heat recovery and solid-state cooling. However, their performance is usually sensitive to material compositions, which is less favorable for industrial applications. In this work, we developed composition-insensitive GeTe-based compounds ((100-x-y)%GeTe-x%CuBiSe₂-y%PbTe, CBSx-Pby) with high ZT_max as well as ZT_ave values. The compositional insensitivity can be associated with the persistently high quality factors across the range of compositions. This is largely due to the interplay between electrical and thermal transport caused by the synergy of CuBiSe₂ and PbTe alloying. CuBiSe₂ alloying can effectively tune the carrier concentrations, while PbTe alloying can significantly decrease the thermal conductivity at a minor sacrifice of electrical properties. The combined effects of CuBiSe₂ and PbTe alloying lead to high carrier mobility of 60 cm²V⁻¹s⁻¹ and low thermal conductivities for CBSx-Pby samples simultaneously. Consequently, high ZT_ave values of 1.4–1.5 in the temperature range of 400 K and 773 K for broad compositions (CBS3-Pby, y = 2 – 8 and CBSx-Pb6, x = 2 – 5) are achieved. A single-leg module is also fabricated, which shows a high power density of 1.46 W/cm² and an excellent efficiency of 13.4%. The high ZT_ave with compositional insensitivity and the outstanding module performance demonstrate the promising large-scale application of the developed GeTe-based compositions.

热电材料因其在废热回收和固态冷却方面具有吸引力而受到全世界的关注。然而，它们的性能通常对材料成分很敏感，这对工业应用不太有利。在这项工作中，我们开发了具有高ZT _max和ZT _ave的成分不敏感的 GeTe 基化合物 ((100- x - y )%GeTe- x %CuBiSe ₂ - y %PbTe, CBS x -Pb y )价值观。成分的不敏感性可能与整个成分范围内的持续高质量因素有关。这主要是由于 CuBiSe ₂和 PbTe 合金化的协同作用引起的电和热传输之间的相互作用。CuBiSe ₂合金化可以有效地调节载流子浓度，而PbTe合金化可以在轻微牺牲电性能的情况下显着降低热导率。CuBiSe ₂和 PbTe 合金化的综合作用导致 60 cm ² V ^-1 s ^{-1的高载流子迁移率和 CBS} x -Pb y样品的低导热率。因此，高对于广泛的成分（CBS3-Pb y , y  = 2 – 8 和 CBS x -Pb6, x  = 2 – 5） ， ZT _ave值在 400 K 和 773 K 的温度范围内为 1.4–1.5 。还制造了一个单腿模块，其显示出1.46 W/cm ²的高功率密度和13.4%的出色效率。具有成分不敏感性的高ZT _ave和出色的模块性能证明了所开发的基于 GeTe 的组合物的大规模应用前景广阔。