High Uniform Carbon Nanotube Thin Films Spray Deposition on Substrates with Patterned Structures Having Height Difference

It was investigated to use the mixture of solvents with different evaporation rates for spray deposition of high uniform CNT films on flexible polymer substrates and substrates with a height differences about 2 micron, near which the formation of nonuniformities is possible when using non-optimal solution composition. The degree of uniformity was estimated by analysis of the surface distribution of the Raman peaks intensity corresponding to CNT. It was shown, in this way, that uniformity was significantly depend which solvent for CNT solution had been used, especially for substrate with patterned structures. In addition, a significant change of resistivity and intensity of Raman scattering of CNT in films was observed after formic acid treatment due to the removal of residual solvent. The obtained results can be used for development of transparent conducting electrodes for organic photovoltaic cells, sensor and autoemission structures.