Silver-Doped Citrus Pectin Resistive Random Access Memory with Multilevel Characteristics

Abstract Electronics based on natural materials have the advantages of simple preparation procedures, low cost, ecofriendliness, and biocompatibility. In this work, the synthesis of silver-doped citrus pectin using the solution method at 2 mg/ml of citrus pectin was investigated, and its simple fabrication method ensured uniform distribution of Ag in citrus pectin thin film. A RRAM device with the Al/Ag-doped citrus pectin/ITO/glass structure was fabricated through the spin-coating method. The results indicate that the best set and reset voltages of the Ag 10 %-doped device were 1 and −1.2 V, respectively. The Ag 10 %-doped device could switch 517 times with an on/off ratio of 2×103 and could be maintained for more than 104 s, indicating excellent stability and reliability. Furthermore, the characteristics of the multilevel storage of the Ag-doped citrus pectin device were investigated. By adjusting different compliance currents, four different resistive states could be formed in a single device with high stability and reliability. In other words, the device could store two bits in a single cell.