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All-inkjet-printing of transistors has received much attention for low cost and flexible integrated circuits. However, most flexible field-effect transistors (FETs) based on the emerging two-dimensional materials suffer from the high cost of substrate and electrode materials. The requirements for high-temperature synthesis and precise control in processing add another layer of complexity. To overcome these issues, low-cost flexible paper-based MoS2 FETs were fabricated by inkjet printing of MoS2 channel materials on paper. Additionally, we proposed and achieved the mask-less and low-temperature formation of source and drain electrodes on paper using in-situ selective-area copper reduction. A low sub-threshold swing of 80 mV/dec, high on/off ratio of 105, and very high turn-on current (Ion) of 200 μA of the paper-based flexible MoS2 FETs were demonstrated using the proposed low-cost and facile all-inkjet-printing technique. The all-inkjet-printing technique assisted by in-situ copper reduction opens new opportunities for low-cost and batch fabrication of paper-based electronic devices in ambient conditions. [ABSTRACT FROM AUTHOR]

In this study, the application of printing technologies for the manufacturing of passive microwave components such as antennas is highlighted, and a detailed example is given. Common printing technologies such as inkjet, screen, and gravure printing become adjusted to print conductive inks for the manufacturing of printed antennas on flat substrates or even on threedimensional (3D) surfaces. Especially, printing technologies such as pad printing, micro-jetting, dispensing, and aerosol jetting are candidates for the manufacturing of microwave components onto challenging 3D surfaces, which may facilitate new designs. Depending on the substrate, one technical challenge is to choose a proper metal ink in combination with a suitable thermal treatment to reach critical requirements such as electrical conductivity above 106 S/m or proper adhesion of the printed pattern for an antenna application. This study gives an overview and comparison of the state-of-the-art materials, inks, printing processes, and options of subsequent thermal treatment. The challenges and possibilities for printed-passive microwave components are discussed with regard to microwave applications. The development of a printed radio-frequency identification antenna on a 3D surface is demonstrated, and the performance of the manufactured antenna is discussed in detail. [ABSTRACT FROM AUTHOR]

Inkjet technology is commonly used as a nonimpact, versatile, and additive digital manufacturing/printing technology. The flexibility offered by this technology toward deposition accuracy, usage, industrial upscaling relevance, and even testing of various solution processable functional materials, e.g., conductors and insulators, makes it very attractive for printed electronic applications. The focus of this paper is improving the curing time durations for inkjet-printed polymeric dielectric layers. In this paper, enhancement with regard to curing time durations is performed and they were found to be reduced dramatically down to less than 1 min using Infrared (IR) emitters, whereas the state-of-the-art curing demands a minimum of 60 min. Here in the experiments, inkjet printing was done using conductive and dielectric inks for developing fundamental devices like a capacitor. The sintering of silver electrodes was done using a conventional oven, and curing of the polymeric dielectric was done using a conventional oven as well as IR radiation. Observations are made on the basis of the dielectric insulation between the top and bottom electrodes for the capacitors containing dielectrics cured in conventional oven and those which are cured using IR radiation under two different manufacturing platforms, i.e., sheet to sheet and roll to roll. [ABSTRACT FROM PUBLISHER]

This paper demonstrates the manufacturing of inductor coils, capacitors, and rectifying diodes solely using the inkjet printing technology. Industrially relevant printheads from Fujifilm Dimatix were employed to prove the process scalability of the inkjet printing technology by manufacturing hundreds of devices. Organic and inorganic conductors and different organic dielectrics were applied for the manufacturing of electrical devices as well as a p-type organic semiconductor. The manufacturing yield effects of varying printing parameters, such as print resolution (drop spacing) and the size of the printed area on the layer morphology and electrical characteristics, were investigated. [ABSTRACT FROM AUTHOR]