Study of PTCDI-C12H25-based organic thin film transistors with bottom contact electrode
2010
A n-type organic semiconductor, N,N'-didodecyl-3,4,9,10-perylene tetracarboxylic diimide (PTCDI-C 12 H 25 ), film
crystallizes on various temperature substrates to act as active layer of organic thin-film transistors (OTFTs). The nuclear
magnetic resonance 1-D hydrogen spectroscopy (1H-NMR) was used to analyze molecular structure of the
PTCDI-C 12 H 25 which was synthesized by us. When the transistors was fabricated on room temperature substrate, the
field-effect mobility of the device was about half of that of the transistor fabricated on high temperature substrate.
Furthermore, x-ray diffraction analysis gave an account that the higher temperature substrate provided better epitaxial
environment for PTCDI-C 12 H 25 thin film growth. The grain size of PTCDI-C12H25 thin films deposited on room
temperature and 100 °C substrates were 24.8 and 35.6 nm, respectively, which analyzed by paracrystalline theory. We
base that larger grain results in better carrier transport in organic films on the grain boundary model which assumed that
the boundary of grain will trap charge carriers when they pass through these grains, and the quality differences of
microstructural within a grain can be neglected. The PTCDI-C 12 H 25 based OTFTs were achieved high performances,
such as field-effect mobility of 0.10 cm 2 V -1 s -1 , threshold voltage 14.5 V, on-off ratio 3.01 × 10 6 and subthreshold swing
1.24 V/dec, when the active layer was grown under substrate temperature of 100 °C. Additionally, contact resistance
analysis reveals that PTCDI-C 12 H 25 thin film on 100 °C substrate has better interface between organic thin film and
electrode.
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