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Optical properties of the interface between indium tin oxides thin films and laser-deposited single-walled carbon nanotubes

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The results of a study of the optical properties of thin films based on indium tin oxides (ITO) with single-walled carbon nanotubes are presented. ITO thin films were deposited onto K8 crown glass substrates using laser-oriented deposition. Using the same method, single-walled carbon nanotubes were deposited onto the ITO surface. To vary the parameters of the interface, the average electric field strength in the range of 100–600 V/cm was adjusted during the deposition process. Identification of the structures was carried out by ellipsometry in the spectral range of 200–800 nm. To interpret the ellipsometry results of ITO thin films on K8 crown glass substrates, the Cauchy (for substrates) and Lorentz (for ITO) models were used together. The ITO–carbon nanotubes interface analysis was carried out by effective medium approximation and the Lorentz model using several oscillators. It has been shown, that in laser-oriented deposition of carbon nanotubes onto the surface of ITO thin films, according to the effective medium approximation, the thickness of the carbon nanotubes-ITO interface varies in the range of 23–36 nm with the percentage of carbon nanotubes in the range of 30–64 % at the interface. The increase in these parameters correlates with an increase in the average electric field strength during the deposition of carbon nanotubes. In accordance with the Lorentz model, a long-wavelength shift of the extinction coefficient peaks and a decrease in the refractive index of the interface in the visible region are observed. This phenomenon is caused by the implantation of carbon nanotubes into ITO. As the electric field strength increases, the contribution of laser-deposited carbon nanotubes to the ITO–carbon nanotubes interface increases, which is accompanied by a decrease in the refractive index in the visible region and a long-wavelength shift of the extinction coefficient peaks. The data obtained indicate the formation of a composite structure based on ITO with carbon nanotubes, the optical properties of which can be controlled by the average electric field strength during the laser-oriented deposition. These structures can be used in the design of optical electronics elements problems in cases where optical matching with adjacent functional layers is necessary. 

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