Abstract
Resistive random-access memory is a candidate for next-generation non-volatile memory architectures. In this study, we use flexographic roll-to-roll printing technology for deposition of the resistive layer, a printing method that allows fast and cost-effective fabrication to create non-volatile resistive memory devices. Metal-free organic polymers blends composed of poly(methyl methacrylate) (PMMA) and a surplus of poly(vinyl alcohol) (PVA) serve as the active layer. Microscopic studies of the roll-to-roll printed layers show circular domains of PMMA embedded in PVA. The influence of the PMMA content in the polymer blend is investigated with respect to the performance and reliability of the resistive memory cells. Electrical characterization reveals a retention time of at least eleven days, a Roff/Ron ratio of approx. two orders and write/erase voltages of + 1/−2 V.
Highlights
Over the last two decades printing processes have been established to fabricate low resolution flexible electronic devices [1, 2] based on printed active and passive electronic components such as diodes [3] and transistors [4, 5]
Before focusing on the electrical characterization, we investigate the morphology of the printed polymer blend by optical microscopy and Atomic force microscopy (AFM)
The phenomena of viscous fingering due to ink splitting between the printing cylinder and substrate are well documented for flexographic printing [55, 56], and the finger-like features along the print have been attributed to the Taylor–Saffman instability [57]
Summary
Over the last two decades printing processes have been established to fabricate low resolution flexible electronic devices [1, 2] based on printed active and passive electronic components such as diodes [3] and transistors [4, 5]. The development of fully printed memristive devices has been mainly focused on electrohydrodynamic (EHD) jet printing techniques for all three layers [14,15,16,17]. Printed memristive systems were fabricated on ITO coated polymer foil or glass which served as substrate and bottom electrode. The dominance of EHD printing methods for fabricating memristive structures is attributed to the high patterning resolution which can be achieved with this technique and which can extent below 100 nm [26]. A number of fully printed memristive systems using the standard ink-jet technique [27,28,29,30,31] and aerosol jet printing [32, 33] have been reported
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