Assessing the Relationships between Interdigital Geometry Quality and Inkjet Printing Parameters

Abstract

Drop on demand (DoD) inkjet printing is a high precision, non-contact, and maskless additive manufacturing technique employed in producing high-precision micrometer-scaled geometries allowing free design manufacturing for flexible devices and printed electronics. A lot of studies exist regarding the ink droplet delivery from the nozzle to the substrate and the jet fluid dynamics, but the literature lacks systematic approaches dealing with the relationship between process parameters and geometrical outcome. This study investigates the influence of the main printing parameters (namely, the spacing between subsequent drops deposited on the substrate, the printing speed, and the nozzle temperature) on the accuracy of a representative geometry consisting of two interdigitated comb-shape electrodes. The study objective was achieved thanks to a proper experimental campaign developed according to Design of Experiments (DoE) methodology. The printing process performance was evaluated by suitable geometrical quantities extracted from the acquired images of the printed samples using a MATLAB algorithm. A drop spacing of 140 µm and 170 µm on the two main directions of the printing plane, with a nozzle temperature of 35 °C, resulted as the most appropriate parameter combination for printing the target geometry. No significant influence of the printing speed on the process outcomes was found, thus choosing the highest speed value within the investigated range can increase productivity.

Inkjet Printing Optimization: Toward Realization of High‐Resolution Printed Electronics

“…[151] Recently, pioneering research was conducted to analyze the importance of considering the geometrical quality of interdigitated electrode (IDE) when optimizing DS. [152] The work highlighted that the DS in the x-direction and y-direction may need to be different to maintain the line continuity along the length of the fingers and critical gap between the fingers. Reproduced under the terms of the CC-BY license.…”

Fabrication of micro-ultrasonic phased array electrode via electric field-driven printing method

“…As a kind of additive manufacturing technology, the direct printing method can directly deposit conductive structures with various shapes on demand without a mask, such as inkjet printing [18,19] and electrohydrodynamic (EHD) printing [20,21]. In particular, EHD printing uses the effect of a high-voltage electric field to eject a jet from the needle, and the jet diameter can be 1-2 orders of magnitude smaller than that of the needles [22].…”

Current Trends in Micro and Nano Manufacturing

“…Drop-on-demand (DoD) inkjet printing is a high-precision, noncontact, and maskless additive manufacturing technique employed in the production of high-precision, micrometre-scaled geometries, allowing free design manufacturing for flexible devices and printed electronics. The influence of the main printing parameters (namely, the spacing between subsequent drops deposited on the substrate, the printing speed, and the nozzle temperature) on the accuracy of a representative geometry consisting of two interdigitated comb-shaped electrodes were examined [11]. A drop spacing of 140 µm and 170 µm on the two main directions of the printing plane, with a nozzle temperature of 35 • C, was shown to be the most appropriate parameter combination for use in printing the target geometry.…”