Resistive switching memory based on chitosan/polyvinylpyrrolidone blend as active layers

Zolile Wiseman Dlamini*, Sreedevi Vallabhapurapu, Shuying Wu, Tebogo Sfiso Mahule, Ananthakrishnan Srivivasan, Vijaya Srinivasu Vallabhapurapu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


We report on resistive switching in ReRAM devices that use chitosan/PVP composite as the active layers. Al/chitosan+PVP/Ag and ITO/chitosan+PVP/Ag devices, each consisting of chitosan/PVP active layer having 1:3, 1:1 and 3:1 chitosan to PVP ratio were studied. Asymmetric threshold switching with Vth=−1.21 V and Vhold=−0.34 V only in the negative voltage bias was obtained for the Al/chitosan+PVP(1:3)/Ag device. The Al/chitosan+PVP(1:1)/Ag device showed better memory behaviour relatively. This device showed bipolar switching with VSET=+0.75 V, and VRESET=−0.28 V, then asymmetric TS with Vth=+0.84 V and Vhold=+0.19 V and lastly back to bipolar switching with VSET=+0.77 V and VRESET=−045 V, during the first, second and third voltage sweeping cycles. We attributed the switching in this device to the formation and rupture of conductive filaments due to Ag ions migration. On the other hand, the Al/chitosan+PVP(3:1)/Ag showed no memory behaviour. In comparison, all ITO/chitosan+PVP/Ag devices did not show any memory characteristics. This indicating the role of the Al/chitosan+PVP interface in the Al/chitosan+PVP/Ag system. Furthermore, we observed the possibility of compliance current dependent or sweeping cycle-dependent decrease in resistance and change from linear to exponential current behaviour in ITO/chitosan+PVP/Ag devices. Resistive switching based on chitosan/PVP blend is essential for biodegradable and environmentally friendly devices. Our results reveal the applicability of chitosan/PVP blend in memory device fabrication and that both the memory and switching can be exploited by varying the ratio of chitosan to PVP in the composite. Lastly, our results demonstrate the importance of electrode material in ReRAM devices.

Original languageEnglish
Article number114677
Pages (from-to)1-7
Number of pages7
JournalSolid State Communications
Publication statusPublished - 1 Apr 2022


  • Resistive switching memory
  • Polymer blend
  • Chitosan
  • Polyvinylpyrrolidone
  • Electrical conduction


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