Abnormal resistive switching in electrodeposited Prussian White thin films

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

“…Defects, grain boundaries, and lattice distortion provide easy diffusion paths for ions, thus forming conduction paths. The results presented here agree with earlier findings obtained from Prussian blue (PB) and Prussian white (PW) thin films [22,23], which indicated that the filamentary conduction mechanism can explain the huge resistance change in those films. Thus far, the conductive channels formed by the migration of potassium have not been proven, but the results presented in this work show strong evidence of how and where changes in the material arise upon the application of an external electric field.…”

“…In previous works, characterizations were presented for Prussian blue (PB) and Prussian white (PW) thin films that showed the behavior of bipolar resistive switching (BRS) and unipolar resistive switching (URS) types, respectively. The samples showed excellent stability of up to 500 cycles and an ON/OFF ratio of three orders of magnitude, with strong evidence that the conductive mechanism occurs in metallic filaments due to the migration of K ions to one of the interfaces [22,23].…”

Study of Growth and Properties of Electrodeposited Sodium Iron Hexacyanoferrate Films

“…Current changes higher than five orders of magnitude can be observed at the switching voltages and demonstrates the high potential as non-volatile random access memory device. In this work, an enhanced change of switching current was observed, higher than in our earlier work [ 22 ], indicating the important role of alkali metal ions in resistive switching devices. The sodium ions have lower mobility and a lower conductivity compared with potassium ions.…”

“…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.…”