ИСТИНА

Gas phase filling of inner space of single-wall carbon nanotubes integrated into thin films by donor or acceptor molecules or covering graphene by a thin film of such molecules allow to form a new prospective material for transparent conductive electrodes with characteristics comparable with those of indium-tin oxide (ITO). From HRTEM images formation of one-dimensional crystals inside nanotubes has been revealed. The optical spectroscopy has shown a Fermi level shift into a valence band and a complete metallization of the nanotubes. The effect was more pronounced for the initially pure metallic nanotubes. To confirm metallization we have measured the electrical resistance of filled SWNT films of different transparency and registered a big drop of electrical resistance (of one order of magnitude) after filling. The best values were 50 Ohm/square at 90% transparency. The temperature dependence of resistance (R(T)) demonstrated two contributions – from the inter-tube interactions and from the filled nanotubes by themselves. For the stronger acceptor (CuCl instead of iodine) the minimum value of R(T) shifted toward low temperatures. This approach opens a new way to form the electrodes for solar cells and optoelectronic devices. The work was supported by RSF project 15-12-30041. E.A.O. thanks project RFBR-15-32-70014_mol_a_mos for support.