Thermoelectric efficiency of (1 - x)(GeTe) x(Bi2Se0.2Te2.8) and implementation into highly performing thermoelectric power generators.
Thermoelectric efficiency of (1 - x)(GeTe) x(Bi2Se0.2Te2.8) and implementation into highly performing thermoelectric power generators.
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DOI：
10.1039/c4dt03425b
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发表时间：
2015-01
影响因子：
4
通讯作者：
J. Koenig;M. Winkler;T. Dankwort;Anna‐Lena Hansen;H. Pernau;V. Duppel;M. Jaegle;K. Bartholomé
中科院分区：
文献类型：
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作者：
J. Koenig;M. Winkler;T. Dankwort;Anna‐Lena Hansen;H. Pernau;V. Duppel;M. Jaegle;K. Bartholomé
在这里，我们报告的第一次在一个完整的模拟辅助的“材料模块”的高性能热电发电机（TEG）的基础上的相变材料和建立热电产生的组合物（1 - x）（GeTe）x（Bi（2）Se（0.2）Te（2.8））的组合开发。对于发电机的设计，我们的方法为基准热电材料的证明，这是不限于固有的不精确的ZT值的测定，但包括实施的材料到TEG。这种方法使热电材料的TEG应用的基准更加可靠。此外，我们分析了两种不同成分的微观结构和性能接近于工作条件，以证明材料对加工和热循环的敏感性。当x = 0.038时，所制备的材料的微观结构保持不变，因此，作为TEG生产的先决条件，获得了优异且稳定的热电性能。对于x = 0.063，我们观察到的原始状态，这是由热循环后形成的平面缺陷释放的应变现象。因此，热电性能显著降低。这些研究结果突出了一个复杂的热电材料的微观结构和性能的相关性。
Here we report for the first time on a complete simulation assisted "material to module" development of a high performance thermoelectric generator (TEG) based on the combination of a phase change material and established thermoelectrics yielding the compositions (1 - x)(GeTe) x(Bi(2)Se(0.2)Te(2.8)). For the generator design our approach for benchmarking thermoelectric materials is demonstrated which is not restricted to the determination of the intrinsically imprecise ZT value but includes the implementation of the material into a TEG. This approach is enabling a much more reliable benchmarking of thermoelectric materials for TEG application. Furthermore we analyzed the microstructure and performance close to in-operandi conditions for two different compositions in order to demonstrate the sensitivity of the material against processing and thermal cycling. For x = 0.038 the microstructure of the as-prepared material remains unchanged, consequently, excellent and stable thermoelectric performance as prerequisites for TEG production was obtained. For x = 0.063 we observed strain phenomena for the pristine state which are released by the formation of planar defects after thermal cycling. Consequently the thermoelectric performance degrades significantly. These findings highlight a complication for deriving the correlation of microstructure and properties of thermoelectric materials in general.