Abstract
In recent years, several novel applications have emerged for ink-jet printing in fields as diverse as electronics and biology. These applications are based on the use of ink-jet technology to precisely position controlled amounts of functional inks on a substrate. In this work the recent progress in ‘drop on demand’ (DOD) ink-jet printing technology of functional materials for electronic applications is reviewed. Different types of DOD ink-jet printers and printheads have been developed for research, development, and manufacturing. We will discuss the main requirements for these different applications. Among the wide range of functional fluids for ink-jet printing, we will focus on printable metal inks, as these are needed for a wide range of applications. In this work, recent progress on fabrication and commercialization of ink-jet printed polymer light emitted diodes, liquid crystal displays, flexible sensors, and organic thin film transistors will be reviewed. In particular, a novel approach to improve the resolution of ink-jet printed electronic circuits will be presented. Thin film organic transistors with transition frequencies higher than 1 MHz have been demonstrated using this technology, which has the potential of extending the range of applications of printed organic electronic devices to the fabrication of electronic circuits requiring higher-frequency operation.
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