Abstract Fermi level is one of the most important parameters for control of semiconductor polarity and improvement of thermoelectric performances. Although single-walled carbon nanotubes (SWCNTs) are promising candidates for thermoelectric materials, control of the Fermi level of SWCNTs with chemical dopants is still challenging. Reported here is the fine-tuning of the Fermi level of SWCNTs with onium salts. The Fermi level of SWCNTs was very sensitive to substituent size on the cation and nucleophilicity of the anion, and the Seebeck coefficients markedly changed between −50 μV K−1 and 68 μV K−1. The optimum Fermi level of p-type SWCNTs that exhibits the maximum power factor was realized by ammonium chloride or pyridine hydrochloride, and the power factor (PF) was improved by about 7 times as compared with non-doped SWCNTs. SWCNTs doped with onium salts were stable in both p-type and n-type states, and thermoelectric performances did not change more than 100 days in the air.

中文翻译：

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用鎓盐微调单壁碳纳米管的费米能级及其在热电材料中的应用

摘要 费米能级是控制半导体极性和改善热电性能最重要的参数之一。尽管单壁碳纳米管 (SWCNT) 是热电材料的有希望的候选者，但用化学掺杂剂控制单壁碳纳米管的费米能级仍然具有挑战性。这里报告的是使用鎓盐对 SWCNT 的费米能​​级进行微调。SWCNTs的费米能级对阳离子的取代基大小和阴离子的亲核性非常敏感，塞贝克系数在-50 μV K-1和68 μV K-1之间变化显着。表现出最大功率因数的p型单壁碳纳米管的最佳费米能级是通过氯化铵或盐酸吡啶实现的，与未掺杂的单壁碳纳米管相比，功率因数（PF）提高了约7倍。