Copper nanoparticles embedded in a polyimide film for non-volatile memory applications
Gupta, Raju Kumar
Kusuma, Damar Yoga
Lee, P. S.
Srinivasan, M. P.
Date of Issue2011
School of Materials Science and Engineering
The charge storage and retention characteristics of a nanoparticle-laden thin polyimide film were investigated for application in non-volatile memory devices. Well-dispersed and uniform sized metallic copper nanoparticles (CuNPs) were formed as embedded entities within the confines of polyimide film that was cast from solution. The nanoparticle-containing films were characterized by X-ray photoelectron spectroscopy, atomic force and scanning electron microscopies. Capacitance–voltage measurements showed that the embedded CuNPs functioned as a floating gate in metal–insulator–semiconductor-type capacitor and exhibited a large hysteresis window of 1.52 V. C–t measurements conducted after applying a charging bias of 5 V showed that the charge was retained beyond 20,000 s. The technique holds promise for developing low-cost processes for memory devices that employ relatively inexpensive materials, and yet demonstrate very good performance.