Characteristics of lattice thermal conductivity and carrier mobility of undoped PbSe-PbS solid solutions

Characteristics of lattice thermal conductivity and carrier mobility of undoped PbSe-PbS solid solutions
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无掺杂PbSe-PbS固溶体的晶格热导率和载流子迁移率特性

DOI:
10.1088/0022-3727/46/40/405301
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发表时间:
2013-10
期刊:
Journal of Physics D: Applied Physics
影响因子:
--
通讯作者:
王建立
王建立
中科院分区:
其他
文献类型:
--
作者:
王建立

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固溶体被认为是制备先进热电材料的有效途径。然而,杂质散射引起的晶格热导率降低的益处将通过载流子迁移率的降低来补偿,因此抑制了最大品质因数(zT)。我们展示了室温下未掺杂PbSe 1 −xSx(0 < x < 1)固溶体的基本性质,包括晶格热导率和载流子迁移率,这提供了一种有效的方法来评估具有最佳掺杂的材料的最大zT。在PbS基体中加入少量PbSe后,当载流子迁移率基本保持不变时,晶格热导率显著降低,表明杂质散射对提高热电性能的有益作用。
Solid solution has been considered as an effective approach to advanced thermoelectrics. However, the benefit from the decrease in lattice thermal conductivity induced by the impurity scattering will be compensated by the reduction in carrier mobility, therefore suppressing the maximum figure of merit (zT). We demonstrate the characteristics of the fundamental properties, including the lattice thermal conductivity and carrier mobility, of undoped PbSe1−xSx solid solutions (0 < x < 1) at room temperature, which provide an efficient way to evaluate the maximum zT of the materials with optimum doping. The lattice thermal conductivity is found to decrease significantly after adding a small amount of PbSe into PbS matrix up to the composition of PbSe0.7S0.3 when the carrier mobility remains virtually unchanged, indicating the beneficial effect of impurity scattering to improve the thermoelectric performance.
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