Self-assembled monolayer modification of silver source-drain electrodes for high-performance pentacene organic field-effect transistors |
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Authors: | Hui-Yu ChenI-Wen Wu Chin-Ti ChenShun-Wei Liu Chih-I Wu |
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Affiliation: | a Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan, ROC b Institute of Chemistry, Academia Sinica, Taipei 11529, Taiwan, ROC c Department of Electronic Engineering, Mingchi University of Technology, New Taipei City 24301, Taiwan, ROC |
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Abstract: | We demonstrated excellent performance improvement of bottom-contact pentacene-based organic thin film transistors (OTFTs) fabricated at room-temperature with silver electrodes modified by self-assembled monolayers (SAMs) of binary mixtures of n-alkanethiol (n-decanethiol, HDT) and the fluorinated analog (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/V s, which is faster than most of bottom-contact pentacene-based OTFTs fabricated at room-temperature 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. |
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Keywords: | Photoemission TFT Organic Pentacene |
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