Effects of Electric Field on a Charge Carrier Mobility in Disordered Organic Semiconductors for Different Localization Length (Monte Carlo Simulation)
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Date
2020-09-09
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Addis Ababa University
Abstract
Organic semiconductors (OSCs) have attracted increasing interest since they have
proven to be a potential use as active material in electronic devices such as organic
light emitting diodes (OLEDs) and organic field effect transistors (OFETs). They
are composed of molecules which are held together by Van-der Waals forces which
are weak compared to covalent bonds and because of this OSCs are flexible and fabricated
easily at low temperature. Van-derWaals bonding has an effect of forming
narrow electronic bandwidths and weak intermolecular interactions which in turn
lead to special and energetic disorder, and also localization of charge carriers. Thus,
the charge carrier mobility in organic semiconductors is generally much smaller
than that in covalently bonded crystalline inorganic semiconductors. Besides this
one of the problems for the practical applications of organic semiconductor is lack
of an understanding of charge carrier transport properties.
In this thesis, we investigate the charge carrier transport behavior of numerical
code we developed using Kinetic Monte Carlo (KMC) simulation technique on the
basis of Miller and Abrahams rate equation. Particularly we will show the mobility
of charge carrier as function of electric field taking into consideration the effects of
temperature, disorder parameter (known as Gaussian width), localization length
and charge carrier density. In our simulation, the results will compare by variation
of localization length, charge carrier density and Gaussian width.
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Keywords
Effects of Electric Field, Charge Carrier Mobility, Disordered Organic Semiconductors, Different Localization Length