arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2101.03340cond-mat.mtrl-sci
收藏

热电材料快速筛选的电子输运描述子

Electronic transport descriptors for the rapid screening of thermoelectric materials

Tianqi Deng, Jose Recatala-Gomez, Masato Ohnishi, D. V. Maheshwar Repaka, Pawan Kumar, Ady Suwardi, Anas Abutaha, Iris Nandhakumar, Kanishka Biswas, Michael B. … 展开作者

Tianqi Deng, Jose Recatala-Gomez, Masato Ohnishi, D. V. Maheshwar Repaka, Pawan Kumar, Ady Suwardi, Anas Abutaha, Iris Nandhakumar, Kanishka Biswas, Michael B. Sullivan, Gang Wu, Junichiro Shiomi, Shuo-Wang Yang, Kedar Hippalgaonkar

摘要:

用于热电能转换的新型材料的发现有可能通过数据驱动的筛选与高通量计算相结合来加速。提高成功选择候选材料的效率的一种方法是通过使用传输描述符对其进行评估。使用数据驱动的筛选,我们在三角ABX2家族中选择了12个潜在的候选者,然后从第一原理进行电荷传输性质模拟。结果表明,在这些材料中的载流子散射过程中占主导地位的电离杂质和极性光学声子,通常假设的声学声子为主的散射相反。结合基于三声子散射的热导率计算,我们预测p型AgBiS2和TlBiTe2作为潜在的高性能热电材料在中温范围内用于低品位废热收集,预测zT在500 K时大于1。使用这些数据,我们进一步推导出基态载流子迁移率和热电功率因子的传输描述符。除了低载流子质量之外,高介电常数被发现是实现高载流子迁移率的重要因素。建立了介电常数与传输性能之间的二次相关性,并与文献进一步验证。展望未来,介电常数可以作为一个独立的调谐旋钮,用于改善热电性能。

英文摘要:

The discovery of novel materials for thermoelectric energy conversion has potential to be accelerated by data-driven screening combined with high-throughput calculations. One way to increase the efficacy of successfully choosing a candidate material is through its evaluation using transport descriptors. Using a data-driven screening, we selected 12 potential candidates in the trigonal ABX2 family, followed by charge transport property simulations from first principles. The results suggest that carrier scattering processes in these materials are dominated by ionised impurities and polar optical phonons, contrary to the oft-assumed acoustic-phonon-dominated scattering. Combined with calculations of thermal conductivity based on three-phonon scattering, we predict p-type AgBiS2 and TlBiTe2 as potential high-performance thermoelectrics in the intermediate temperature range for low grade waste heat harvesting, with a predicted zT above 1 at 500 K. Using these data, we further derive ground-state transport descriptors for the carrier mobility and the thermoelectric power factor. In addition to low carrier mass, high dielectric constant was found to be an important factor towards high carrier mobility. A quadratic correlation between dielectric constant and transport performance was established and further validated with literature. Looking ahead, dielectric constant can potentially be exploited as an independent tuning knob for improving the thermoelectric performance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑