A Bio-Material Based Write-Once-Read-Many Times Memory Using Sodium Caseinate and Polyvinylpyrrolidone Blend

Bio-material based memory devices have envinced enormous interests among the researchers in recent years due to its simple, low cost and less toxic device fabrication methodology. Moreover, such devices are bio-degradable and found to exhibit impressive data storage capabilities and high device flexibility. Here, we have fabricated a Write-Once-Read-Many (WORM) times memory based on natural casein, which is processed from edible animal milk. The casein obtained was solution-processed to produce water soluble sodium caseinate (NaCas), which is a salt of casein, and then blended with polyvinylpyrrolidone (PVP). Silver (Ag) was used as the top electrode and ITO coated PET substrate as the bottom electrode. The device has shown good data retention of more than 17 days and a cyclic endurance of 100 cycles. Moreover, the SET voltage for our Ag/NaCas-PVP/ITO-PET device is less than 1 V, thus making the device suitable for low power, long term and environment friendly memory application.