Overview of organic memory devices

Abstract

The demand for more efficient and faster memory structures is greater today than ever before. The efficiency of memory structures is measured in terms of storage capacity and the speed of functioning. However, the production cost of such configurations is the natural constraint on how much can be achieved. Organic memory devices (OMDs) provide an ideal solution, in being inexpensive, and at the same time promising high performance. However, all OMDs reported so far suffer from multiple drawbacks that render their industrial implementation premature. This article introduces the different types of OMDs, discusses the progress in this field over the last 9 years and invokes conundrums that scholars of this field are currently faced with, such as questions about the charging mechanism and stability of devices, contradictions in the published work and some future directions.

Memory-like behavior as a feature of electrical signal transmission in melanin-like bio-polymers

“…9 Like melanin-based MIM-like structure, the melanin-based MIS on Si displays an intrinsic charge storage effect not induced by metallic nanoclusters enclosure, as typically observed in other organic polymers, but by water molecules acting as ambipolar trapping centers in the melanin matrix. 9,[20][21][22][23] This conclusion was further supported by findings demonstrating charge carriers trapping and storage capability of embedded water molecules both in organic and inorganic matrix. [24][25][26] The results with melanin were considered innovative since they overcome scalability issues represented by the need to deposit metallic nanoclusters and suggested that melanin plays an in-born memory-like role in biological system when subjected to electrical stimuli.…”

Conductance-dependent negative differential resistance in organic memory devices

“…The N-shaped devices generally respond symmetrically to applied voltages of opposite polarities. 12 Namely, negative applied voltages have the same effect as positive voltages. Scott and Bozano 13 studied the phenomenon by using different electrode materials and found that bistability was insensitive to the choice of electrodes.…”

Creating Electrical Bistability Using Nano-bits — Application in 2-Terminal Memory Devices

“…A memory effect has been reported in a large variety of materials, including small organic molecules, nano-particles, polymers and also a variety of device and material configurations. A review article by Prime and Paul [12] discuss and differentiate among a number organic memory devices reported in the literature. Polymer memory devices (PDMs) are a class of memory devices, an admixture of polymer, nanoparticles and/or small organic molecules which exhibit two distinct electrical conductance states (low and respectively high) when the voltage is applied.…”