Electrical Properties Of Junctions Between Aluminuim And Poly3-(2-octyloxy-5-(1-oxooctyl)phenyl)thiophene

In this thesis, the property of the junction between aluminium and neutral conjugated polymerrnis studied. The conjugated polymer used is poly[3-(2'-octyloxy-5'-(1'''-rnoxooctyl)phenyl)thiophene] which is the derivative of polythiophene having 8-carbon atomsrnalkyl side chain which makes it different from other thiophene derivatives.rnThe techniques employed are optical absorption spectrum, I-V characterization and impedancernspectroscopy study. Optical spectroscopy study showed the optical band gap of the polymer isrn2.03eV indicating the polymer is in the range of conventional inorganic semiconductor. Basedrnon this result the theoretical background in studying the property of junction betweenrnaluminium and the polymer is that of conventional inorganic semiconductors.rnThe I-V characteristics of Al/poly[3-(2'-octyloxy-5'-(1'''-oxooctyl)phenyl)thiophene]/ITOrnstructure showed non-ohmic, non-rectifying and nearly symmetrical curves. The complexrnimpedance analysis exhibited a semicircle whose diameter depends on the magnitude of thernapplied bias voltage; the diameters are small for larger bias voltages and increases for smallrnintermediate bias voltages. This result is consistent with the I-V characteristics. Therefore, thernjunction between aluminum and the polymer forms no Schottky barrier

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