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Effect of aperture on photoelectric properties of screen printed films

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Document pages: 7 pages

Abstract: The effect of pore size on the photoelectric properties of TiO2 thin films was studied. TiO2 films with different weight percentage of carbon black (wt ) were deposited on fluorine doped tin oxide (FTO) coated on glass substrate by screen printing. Carbon black decomposes during annealing and forms artificial pores in the film. All films are 3.2 points   µ m thickness measured by surface profiler. The transmission and reflection spectra of the films at 300-900 photon wavelengths were studied by UV-vis-NIR spectrophotometer, while the absorbance was studied in the range of 350-900 nm. The band gap and refractive index of the films were studied by spectroscopy. It is found that the reflectivity, absorbance and refractive index increase with the increase of carbon black concentration. Thre was no significant variation in band gaps of films with change in carbon black concentrations. Transmittance reduced as the concentration of carbon black in TiO2 increased (i.e., increase in pore size). Currents and voltages () characteristics of the films were measured by a 4-point probe. Resistivity () and conductivity () of the films were computed from the values. It was observed that resistivity increased with carbon black concentrations while conductivity decreased as the pore size of the films increased.

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