Browsing by Author "Digafe, Hiwot"

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    Electrical Properties of Junctions between Aluminum & POLY [3-(2'-PENTYLOXY-5'-(1'''-OXOOCTYL) PHENYL)THIOPHENE]
    (Addis Ababa University, 2003-06) Digafe, Hiwot; Workalemahu, Bantikassegn (PhD)
    This thesis is based on the study of the electronic properties of Junction between Al and poly[3-(2'-pentyloxy-5'-(1'''-oxoocty)phenyl)thiophene in the form of Al/poly[3-(2'-pentyloxy- 5'-(1'''-oxoocty)phenyl)thiophene]/ITO sandwich structure. The junction between aluminium contacts to poly[3-(2'-pentyloxy-5'-(1'''-oxoocty)phenyl]thiophene films was studied using current-voltage, capacitance-voltage and complex impedance spectroscopy techniques. The current density-voltage curve is asymmetric and non-ohmic and shows Schottky barrier type rectification. The complex impedance spectra are semi-circles that show the existence of a region depleted of mobile charge carriers. An equivalent circuit consisting of one parallel RC circuit is envisaged as a model of the interface
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    Electrical Properties of Junctions between Aluminum and Poly [3-(2'-PentyloxY-5'-(1'''-OxooctyL) Phenyl)Thiophene]
    (Addis Ababa University, 2003-06) Digafe, Hiwot; Workalemahu, Bantikassegn (PhD)
    This thesis is based on the study of the electronic properties of Junction between Al and poly[3-(2'-pentyloxy-5'-(1'''-oxoocty)phenyl)thiophene in the form of Al/poly[3-(2'-pentyloxy- 5'-(1'''-oxoocty)phenyl)thiophene]/ITO sandwich structure. The junction between aluminium contacts to poly[3-(2'-pentyloxy-5'-(1'''-oxoocty)phenyl]thiophene films was studied using current-voltage, capacitance-voltage and complex impedance spectroscopy techniques. The current density-voltage curve is asymmetric and non-ohmic and shows Schottky barrier type rectification. The complex impedance spectra are semi-circles that show the existence of a region depleted of mobile charge carriers. An equivalent circuit consisting of one parallel RC circuit is envisaged as a model of the interface