Tuning counterion chemistry to reduce carrier localization in doped semiconducting carbon nanotube networks
Tuning counterion chemistry to reduce carrier localization in doped semiconducting carbon nanotube networks
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DOI：
10.1016/j.xcrp.2023.101407
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发表时间：
2023-05
影响因子：
8.9
通讯作者：
Tucker L. Murrey;Taylor J. Aubry;O. Ruiz;Kira A. Thurman;K. Eckstein;Evan A. Doud;Julia M. Stauber;A. Spokoyny;B. J. Schwartz;T. Hertel;J. Blackburn;Andrew J. Ferguson
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文献类型：
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作者：
Tucker L. Murrey;Taylor J. Aubry;O. Ruiz;Kira A. Thurman;K. Eckstein;Evan A. Doud;Julia M. Stauber;A. Spokoyny;B. J. Schwartz;T. Hertel;J. Blackburn;Andrew J. Ferguson
理解和控制静电相互作用对注入的电荷载流子的传输的影响对于在光电应用中利用π共轭半导体是重要的。在这里，我们探讨掺杂剂的化学和电子结构的掺杂效率和电荷载流子输运的半导体单壁碳纳米管（s-SWCNT）网络使用分子电荷转移掺杂剂的基础上官能化的二十面体十二硼烷（DDB）集群的影响。计算表明，DDB核上的电子密度的局部化降低了促成s-SWCNT中的空穴局部化的库仑相互作用，从而改善了电荷载流子传输。增强的离域在较低的电荷载流子密度下产生电导率和热电势的增加，从而产生增强的热电传输和热电功率因子，其超过了富集的s-SWCNT薄膜网络的先前最佳同类。这种策略可以广泛应用于π共轭半导体，以调整和增强各种能量收集设备的性能。
Understanding and controlling the impact that electrostatic interactions have on the transport of injected charge carriers is important for the utilization of pi-conjugated semiconductors in opto-electronic applications. Here, we explore the impact of dopant chemical and electronic structure on the doping efficacy and charge carrier transport in semiconducting single-walled carbon nanotube (s-SWCNT) networks using molecular charge-transfer dopants based on functionalized icosahedral dodecaborane (DDB) clusters. Calculations indicate that localization of electron density on the DDB core reduces the coulombic interactions that contribute to hole localization in the s-SWCNTs, thereby improving charge carrier transport. The enhanced delocalization produces an increase in the electrical conductivity and thermopower at lower charge carrier densities, yielding enhanced thermoelectric transport and a thermoelectric power factor that surpasses the previous best in class for enriched s-SWCNT thin-film networks. This strategy can be applied broadly across pi-conjugated semiconductors to tune and enhance performance in a variety of energy harvesting devices.