Study on the Electrical Conduction Mechanism of Unipolar Resistive Switching Prussian White Thin Films

Abstract

The electrical conduction mechanism of resistive switching Prussian white (PW) thin films obtained by the electrodeposition method was examined by AC impedance spectroscopy and DC current–voltage measurements. Using an electrode tip to contact PW grown over Au, robust unipolar resistive switching was observed with a current change of up to three orders of magnitude, high repeatability, and reproducibility. Moreover, electrical impedance spectroscopy showed that the resistive switching comes from small conductive filaments formed by potassium ions before the establishment of larger conductive channels. Both voltammetry and EIS measurements suggest that the electrical properties and conductive filament formation are influenced by defects and ions present in the grain boundaries. Thus, PW is a potential material for the next generation of ReRAM devices.

Fabrication of Graphene Oxide-Based Resistive Switching Memory by the Spray Pyrolysis Technique for Neuromorphic Computing

“…17,18 The main RS mechanism consists of forming a conductive filament within the insulator layer that connects the bottom electrode (BE) to the top electrode (TE). 16,19 The conductive filament originates from an active top electrode (such as Ag, Cu) or emerged oxygen vacancies from the switching layer. 18−20 RRAMs with attractive properties such as multilevel switching, fast programming, and electronic synapse are promising candidates to replace traditional storage devices.…”

“…This kind of memory switches between two resistance states called HRS (high-resistance state) and LRS (low-resistance state) . Resistive switching (RS) depends on the switching layer and electrode materials. , The main RS mechanism consists of forming a conductive filament within the insulator layer that connects the bottom electrode (BE) to the top electrode (TE). , The conductive filament originates from an active top electrode (such as Ag, Cu) or emerged oxygen vacancies from the switching layer. − RRAMs with attractive properties such as multilevel switching, fast programming, and electronic synapse are promising candidates to replace traditional storage devices. , Furthermore, the conventional von Neumann architecture of computers is not efficient for significant data processing due to high power consumption and data traffic jam between cores and memory units. ,, According to this issue, brain-inspired computing as neuromorphic computing offers worth noting characteristics for energy- and time-efficient processing. , Brain-inspired algorithms such as artificial neural networks (ANN) have brought about a significant revolution in machine learning. , However, in these algorithms, the core and memory unit are separated, which has caused several issues with a considerable amount of data. This separation lowers the processing data and raises the processing energy consumption.…”

Study of Growth and Properties of Electrodeposited Sodium Iron Hexacyanoferrate Films

“…In addition, electrochromism [ 13 , 14 ], thermochromism [ 15 ], photochemical magnetism [ 16 ], electrocatalysis [ 17 ], and sensing [ 18 , 19 , 20 ] have been shown in PBA. Recently, it was reported when applying a voltage, PB can switch several times between low and high resistive resistance states, known as resistive switching effect [ 21 , 22 , 23 ]. Thereby, strong evidence was given: that electrical conduction in these materials is dominated by the migration of alkali metal ions.…”

“…Thereby, strong evidence was given: that electrical conduction in these materials is dominated by the migration of alkali metal ions. Depending on the stoichiometry of PB, particularly the amount of alkali metal ions, bipolar [ 21 , 22 ] or unipolar resistive switching behavior [ 23 ] have been reported.…”

“…The fabrication of PBA layers can be performed by electrodeposition [ 24 , 25 ], epitaxial methods [ 26 ], spin coating [ 27 ], and vapor diffusion [ 28 ]. Among them, electrodeposition can be seen as a highly suitable method for the fabrication of PBA because of controlled film parameters (e.g., film thickness, morphology, crystallographic orientation, stoichiometry), high reproducibility, low costs, and fast processing [ 23 ]. With careful control of the deposition parameters, electrodeposition can give single-crystalline grains and achieve high crystal quality comparable with the epitaxial method.…”