Junction Studies Between Aluminum And Polymer Poly2-methoxy-5-(3070- Dimethyloctyloxy)-1 4-phenylene Vinylene Mdmo-ppv And Mdmo-ppv Blended With C60

This thesis is based on the experimental investigation of the junction between reactive lowrnwork function metal, Aluminum and Conjugated polymer, MDMO-PPV. The polymer isrnblended with C60 and the composition were also made with pure polymer. The techniquesrnemployed are absorption spectroscopy, current-voltage characteristics measurement andrncomplex impedance spectroscopy.rnThe absorption measurement shows that MDMO-PPV is a semiconductor with energyrnband gap of about 2.0032eV. The current density-voltage curve is found to be asymmetricrnand non-ohmic and shows Schottky barrier type recti¯cation. The recti¯cation ratio ofrnfullerene blended MDMO-PPV is found to be 100 whereas that of pure MDMO-PPV isrnbetween 10 and 20, and more diode characteristics are observed in the case of fullerenernblended polymer. The complex impedance spectra are single semi-circle displaced fromrnthe origin that show the existence of mobile charge depleted regions with some contactrnresistance. The radius of the semi-circle is found to depend on the bias of the junction

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