Li Zhili, Zhang Jiye, Luo Pengfei, Chen Jiayi, Huang Bowen, Sun Yuzhe, Luo Jun
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China.
Materials Genome Institute, Shanghai University, Shanghai 200444, China.
ACS Appl Mater Interfaces. 2023 Jul 19;15(28):33605-33611. doi: 10.1021/acsami.3c05688. Epub 2023 Jul 1.
Silver chalcogenides demonstrate great potential as flexible thermoelectric materials due to their excellent ductility and tunable electrical and thermal transport properties. In this work, we report that the amorphous/crystalline phase ratio and thermoelectric properties of the AgSTe ( = 0.55-0.75) samples can be modified by altering the S content. The room-temperature power factor of the AgSTe sample is 4.9 μW cm K, and a higher power factor can be achieved by decreasing the carrier concentration as predicted by the single parabolic band model. The addition of a small amount of excessive Te into AgSTe (AgSTe) not only enhances the power factor by decreasing the carrier concentration but also reduces the total thermal conductivity due to decreased electronic thermal conductivity. Owing to the effectively optimized carrier concentration, the thermoelectric power factor and dimensionless figure of merit of the sample with = 0.007 reaches, respectively, 6.2 μW cm K and 0.39, while the excellent plastic deformability is well maintained, demonstrating its promising potential as a flexible thermoelectric material at room temperature.
硫族化银由于其优异的延展性以及可调节的电传输和热传输特性，作为柔性热电材料展现出巨大潜力。在本工作中，我们报道了通过改变硫含量，可以调节AgSTe（x = 0.55 - 0.75）样品的非晶/晶相比例和热电性能。AgSTe样品的室温功率因数为4.9 μW cm⁻¹ K⁻²，并且如单抛物线带模型所预测的那样，通过降低载流子浓度可以实现更高的功率因数。向AgSTe（AgSTe₁₋ₓ）中添加少量过量的碲不仅通过降低载流子浓度提高了功率因数，还由于电子热导率降低而降低了总热导率。由于载流子浓度得到有效优化，x = 0.007的样品的热电功率因数和无量纲优值分别达到6.2 μW cm⁻¹ K⁻²和0.39，同时良好地保持了优异的塑性变形能力，证明了其作为室温下柔性热电材料的潜在应用前景。
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