Printed electronics is an emergent subject for the low-cost and large-area fabrication of flexible electronic devices. Direct printing of organic thin-film transistors (OTFTs) is a particularly promising fabrication method that can be used in large-scale production at low cost. In this work, we developed “room-temperature printed electronics”, which allows OTFT devices to be printed at room temperature without application of heat. The room-temperature fabrication process never causes any thermal damage to the flexible substrate. Thus the process allows very accurate and high-resolution patterning even on a flexible plastic substrate. We also developed the printing technique using patterned surface wettabilities on surface. Through this process, short-channel OTFTs having 1-um channel length were successfully demonstrated. These results suggest that printed electronics technologies are promising as a core technology for low-cost and high-performance printed electronics.
Low cost and ecological printing methods for mass production of thin, light, flexible electronic devices
incorporating organic semiconductors are key to the further integration of electronics into everyday life. In
this light, we have developed an all-solution fabrication process for plastic electronics devices, in which all
components of devices spontaneously assemble with desired geometry. By formation of surface molecular
template composed of self-assembled monolayers, complete arrays of organic field-effect transistors
including gate electrodes, source and drain electrodes, and organic semiconductor layers have been patterned
from solution phase with excellent operational characteristics on a plastic substrate. This bottom-up method of
device fabrication, in which the functional properties of molecules are utilized for their spontaneous
assembly, may become a core technology for plastic electronics. In this paper, we describe the principles of
the surface-selective deposition technique and its application to electronic device production processes.
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