Abstract By utilizing a novel design of an electronic device with microfabricated through-etched slits for transmission electron microscopy (TEM), single-walled carbon nanotubes (SWNTs) suspended over two metal electrodes were successfully characterized. A semiconducting-semiconducting intramolecular junction (IMJ) was found from a change in chirality along the tube. Interestingly non-linear current-voltage characteristic was found despite almost negligible difference in the band-gap energy (13 meV). The non-linear electrical transport property can be caused by asymmetric defect states positioned in the band-gap of two semiconducting tubes, which make one as donor (similar to a p-type semiconductor) and the other as acceptor (similar to n-type semiconductor). The strain by deformation along the tube can also cause the electrical non-linearity.

中文翻译：

---

具有分子内结的单壁碳纳米管的结构测定及其电传输特性

摘要 通过利用具有用于透射电子显微镜 (TEM) 的微加工蚀刻狭缝的电子器件的新颖设计，成功地表征了悬浮在两个金属电极上的单壁碳纳米管 (SWNT)。从沿管的手性变化中发现了半导体-半导体分子内结（IMJ）。有趣的是，尽管带隙能量 (13 meV) 的差异几乎可以忽略不计，但还是发现了非线性电流-电压特性。非线性电传输特性可能是由位于两个半导体管带隙中的不对称缺陷态引起的，它们使一个作为施主（类似于 p 型半导体）而另一个作为受主（类似于 n 型半导体）半导体）。沿管变形引起的应变也会导致电气非线性。