High-performance C60 n-channel organic field-effect transistors through optimization of interfaces

High-performance C60 organic field-effect transistors (OFETs) have been obtained by engineering the essential electrode/semiconductor and dielectric/semiconductor interfaces. By using calcium (Ca) as the source and drain electrodes, the width-normalized contact resistance (RCW) at the electrode/semiconductor interface for devices with channel lengths ranging from 200 down to 25 μm could be reduced to a constant value of 2 kΩ cm at a gate-source voltage (VGS) of 2.6 V, leading to electrical properties that are dominated by gate-modulated resistance of the channel as in conventional metal-oxide-semiconductor field-effect transistors. Channel length scaling of the source-drain current and transconductance is observed. Average charge mobility values of 2.5 cm2/V s extracted at VGS<5 V are found independent of channel length within the studied range. Besides high mobility, overall high electrical performance and stability at low operating voltages are demonstrated by using a 100-nm-thick high-κ gate dielectric...

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