Electrical Properties of Junctions between Aluminium and Pol Y(3-0ctylphenylthiophene) (POPT)
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Date
1999-07
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Addis Ababa University
Abstract
This thesis is based on the study of the electronic properties of
poly(3-octylphenylthiophene) (POPT) in the form of AlJPOPTIITO sandwich stlucture
prepared in our laboratory using a vacuum evaporation technique. The electronic
properties of the sandwich structure were analyzed using cmrent- voltage characteristics
and complex impedance spectroscopy.
The optical absorption spectrum of spin coated thin films of POPT was measured using
Perkin Elmer 1..19 UVNislNIR spectrophotometer which showed a forbidden energy gap
of about 1.77eV and hence it belongs to the class of semiconducting organic materials.
The I-V characteristics of the sandwich structure show a rectifying behavior. The
complex impedance analysis exhibits a bias voltage dependent part of a single semicircle
in the Cole-Cole plot. This is modeled by one parallel RC electrical circuit, usually
obtained fiĀ·om metal-semiconductor (MS) devices
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Electrical Properties