Understanding Diameter and Length Effects in a Solution‐Processable Tellurium‐Poly(3,4‐Ethylenedioxythiophene) Polystyrene Sulfonate Hybrid Thermoelectric Nanowire Mesh,Advanced Electronic Materials

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Understanding Diameter and Length Effects in a Solution‐Processable Tellurium‐Poly(3,4‐Ethylenedioxythiophene) Polystyrene Sulfonate Hybrid Thermoelectric Nanowire Mesh
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2021-01-21 , DOI: 10.1002/aelm.202000904
Madeleine P. Gordon _{1,

2} , Kyle Haas _{2,

3} , Edmond Zaia _{2,

4} , Akanksha K. Menon ₅ , Lin Yang ₅ , Alexandra Bruefach _{6,

7} , Michael D. Galluzzo ₄ , Mary C. Scott _{6,

7} , Ravi S. Prasher _{5,

8} , Ayaskanta Sahu _{2,

9} , Jeffrey J. Urban ₂

Affiliation

Organic–inorganic hybrids offer great promise as solution‐processable thermoelectric materials. However, they have struggled to surpass the performance of their rigid inorganic counterparts due, in part, to a lack of synthetic control and limited understanding of how inorganic nanostructure dimensions impact overall charge transport. While it has been hypothesized that length, diameter, and aspect ratio (AR) all impact electronic transport in hybrid nanowires, the field lacks clarity on the relative role of each. In this study, the experimental parameter of ligand molecular weight (MW) is investigated as a synthetic knob for modulating nanowire dimensions, as well as the deconvolution of nanowire length versus diameter impacts on electron transport. By increasing ligand MW, larger nanowire AR dispersions occur and an optimal power factor of ≈130 μWm⁻¹ K⁻² is achieved for a modest AR of 73. Power factors of this magnitude are thought to only be achievable in ultrahigh AR systems; representing a 183% increase in performance over literature reports with similar AR. Additionally, nanowire diameter is demonstrated to be a far more sensitive parameter for enhancing performance than modulating length. This study provides improved fundamental insight into rational synthetic design avenues for future enhancements in the performance of hybrid materials.

中文翻译：

了解可溶液处理的碲-聚（3,4-乙撑二氧噻吩）聚苯乙烯磺酸盐混合热电纳米线网中的直径和长度效应

有机-无机杂化材料作为可溶液加工的热电材料具有广阔的前景。然而，由于缺乏合成控制和对无机纳米结构尺寸如何影响整体电荷传输的了解有限，他们一直在努力超越其刚性无机对应物。尽管已经假设长度，直径和长宽比（AR）都会影响混合纳米线中的电子传输，但该领域仍不清楚每个纳米线的相对作用。在这项研究中，配体分子量（MW）的实验参数作为调制纳米线尺寸的合成旋钮进行了研究，以及纳米线长度与直径的反卷积对电子传输的影响。通过增加配体分子量，对于73的适度AR，可以达到^-1 K ^-2。只有在超高AR系统中才能达到这种大小的功率因数。与具有类似AR的文献报道相比，性能提高了183％。此外，纳米线直径被证明是比调节长度更敏感的参数，可以提高性能。这项研究为合理的合成设计途径提供了改进的基础见解，以进一步增强混合材料的性能。

更新日期：2021-03-11

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