The formation of p-n junction in double-walled carbon nanotubes (DWNTs) is successfully investigated for the first time through encapsulating heteromolecules/atoms via a plasma-ion irradiation method. DWNTs filled with both electron donor atoms and electron acceptor molecules are synthesized during the plasma ion-irradiation process. It is found that the electrical transport properties of DWNTs after encapsulating either Cs-C6o or Cs-I are significantly different from those of unipolar p- or n-type DWNTs encapsulating one kind of molecules or atoms. The p-n junctions with excellent rectifying characteristics are successfully realized in many of DWNT-based devices, suggesting a new way in making functional DWNTs.
ASJC Scopus subject areas
- Physics and Astronomy(all)