Electrical bistability in electrostatic assemblies of CdSe nanoparticles.
We report electrical bistability in electrostatic assembly of CdSe nanoparticles. We obtained thin films of the nanoparticles via layer-by-layer electrostatic assembly technique, which provided a nanoscale control to tune the thickness. Devices based on such thin films exhibit electrical bistability along with memory phenomenon. The bistability is due to charge confinement in the nanoparticles. Conduction mechanism changes from an injection-dominated to a bulk one during switching from a low- to a high-conducting state. Additionally, results from impedance spectroscopy show that the dielectric constant of the material increases during the transition. Both random-access and read-only memory applications are observed in these systems.
Mohanta
Kallol
K
Department of Solid State Physics, Indian Association for the Cultivation of Science, Kolkata 700 032, India.
Majee
Swarup K
SK
Batabyal
Sudip K
SK
Pal
Amlan J
AJ