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Effect of Film Morphology on Charge Transport in C60-based Organic Field Effect Transistors

Published online by Cambridge University Press:  01 February 2011

Mujeeb Ullah
Affiliation:
mujeeb_49@yahoo.co.uk, Johannes Kepler University Linz, Institute of Semiconductor and Soild State Physics, Linz, Austria
Andrey K. Kadashchuk
Affiliation:
kadash@iop.kiev.ua, National Academy of Sciences of Ukraine, Institute of Physic, Kyiv, Ukraine
Philipp Stadler
Affiliation:
philipp.stadler@jku.at, Johannes Kepler University Linz, Linz Institute of Organic Solar Cells (LIOS), Linz, Austria
Alexander Kharchenko
Affiliation:
Alexander.Kharchenko@panalytical.com, 5PANalytical B.V, Almelo, Netherlands
Almantas Pivrikas
Affiliation:
almantas.pivrikas@jku.at, Johannes Kepler University Linz, Linz Institute of Organic Solar Cells (LIOS), Linz, Austria
Clemens Simbrunner
Affiliation:
clemens.simbrunner@jku.at, Johannes Kepler University Linz, Institute of Semiconductor and Soild State Physics, Linz, Austria
Niyazi Serdar Sariciftci
Affiliation:
Serdar.Sariciftci@jku.at, Johannes Kepler University Linz, Linz Institute of Organic Solar Cells (LIOS), Linz, Austria
Helmut Sitter
Affiliation:
helmut.sitter@jku.at, Johannes Kepler University Linz, Institute of Semiconductor and Soild State Physics, Linz, Austria
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Abstract

The critical factor that limits the efficiencies of organic electronic devices is the low charge carrier mobility which is attributed to disorder in organic films. In this work we study the effects of active film morphology on the charge transport in Organic Field Effect Transistors (OFETs). We fabricated the OFETs using different substrate temperature to grow different morphologies of C60 films by Hot Wall Epitaxy. Atomic Force Microscopy images and XRD results showed increasing grain size with increasing substrate temperature. An increase in field effect mobility was observed for different OFETs with increasing grain size in C60 films. The temperature dependence of charge carrier mobility in these devices followed the empirical relation named as Meyer-Neldel Rule and showed different activation energies for films with different degree of disorder. A shift in characteristic Meyer-Neldel energy was observed with changing C60 morphology which can be considered as an energetic disorder parameter.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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