High Performance of Pentacene Thin-Film Transistor with Self-Assembled Monolayer on Silver Electrodes
Date Issued
2011
Date
2011
Author(s)
Chen, Hui-Yu
Abstract
Excellent performance improvement has been demonstrated of bottom-contact pentacene-based organic thin film transistors (OTFTs) with silver electrodes modified by self-assembled monolayers (SAMs) of binary mixtures of n-alkanethiol (n-decanethiol, HDT) and the fluorinated analogue (3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluoro-1-decanethiol, FDT). The OTFTs with modified silver (Ag) electrodes exhibit carrier mobility of 0.21 cm2/ Vs, which is faster than most bottom-contact pentacene-based OTFTs with gold (Au) electrodes. The threshold voltage is reduced from -30 V of the devices with Au electrodes to -5.4 V of the devices with modified Ag electrodes. The hole injection barrier is also reduced with modified Ag as indicated by ultraviolet photoemission spectroscopy. The enhancement of the saturation current and the mobility of the devices are due to both the reduction of hole injection barriers and the continuous grain size of pentacene on top of electrodes and dielectrics.
Subjects
Pentacene
Organic thin film transistors
Self-assembled monolayers
Carrier Mobility
Threshold Voltage
Hole injection barrier
Type
thesis
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