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Experimental and Simulation Improvement of ITO Thin Films Applied to Flat Areas of Displays



Author(s)

Zakia Fekkai

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DOI:10.17265/2161-6221/2011.09.007

Department of Physics, Al Imam University, Riyadh 11623, Saudi Arabia

Transparent conductive indium tin oxide (ITO) thin films were used as electrode of organic light emitting diodes (OLED’s), flat panel display devices, and thin film solar cells due to its high electrical conductivity and high transparency in the visible light wavelength range. In this investigation, the electrical, structural, and optical properties of these films were examined. The resistivity of the ITO film electrode was calculated based on the sheet resistance R_s measured by the standard four-point probe technique at room temperature. A low resistivity of 2.2 × 10^-4 Ω·cm and an average transmittance of more than 92% was measured in the visible range. A typical value of work function for the ITO, calculated from the optical spectra used in all our experiments, was 4.8 eV and surface roughness of approximately 15 nm for a Super-smooth ITO films of about 150 nm thick. Modeling of the ITO optical properties is presented and compared to experimental data. The modeled transmission and reflection spectra of ITO thin films on glass are in a good agreement with measured data. A lower resistivity and better spectra selectivity is a measurement of the quality and potential use of Indium Tin oxide for the application as transparent electrode of organic light-limiting diodes. OLED’s based on optimized ITO films were fabricated and tested. It was found that the surface roughness and work function of ITO films are very important to enhance the stability and efficiency of OLED’s. For electro-optical characteristics, the fabricated OLED gave a power efficiency of 50 lm/W at 40 cd/m², 3.4 Volts and 55 cd/A.

ITO thin films, optical transmission, organic light emitting diode (OLED), Mat lab modeling, simulation.