Masters Degrees (DPCMS)

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Browsing Masters Degrees (DPCMS) by Subject "Four-point probe method"

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    Investigation of the dependence of sheet resistance on the thickness of spin coated poly (3-Hexylthiophene) thin films
    (University of Namibia, 2024) Mutenda, Oliver Sibenga
    Sheet resistance (R□) and thickness of as-cast and post-treated poly(3- hexylthiophene) (P3HT) thin films fabricated on non-conductive glass substrates by the spin coating method, were determined under dark, and illuminated conditions. R□ of P3HT thin films of different thicknesses were compared, to examine the effect of illumination on the R□, and hence on the resistivity of the films. Commercially available P3HT was purchased and dissolved in chloroform (CHCl3). Glass slides were cleaned using detergent, acetone, and alcohol, in an ultrasonic bath, followed by cleaning in distilled water. P3HT thin films were fabricated by spin coating CHCl3 based solutions on cleaned, dry glass substrates, in ambient air. The films were annealed at a controlled temperature, and then the R□ of each thin film was measured, using the in-line four-point probe method. The thicknesses of the thin films were varied by varying the spin speed (ω) of the spin coater. The results showed a correlation between the R□ and the P3HT thin films’ thickness. The R□ reduces as the thicknesses of the P3HT thin films increase in the light, and in the dark, for as-cast, and annealed, P3HT thin films. Annealing also reduced the R□ of the P3HT thin films, and R□ showed some reductions when measured in the dark. The four-point probe method can be used to characterise materials