Publication Details (including relevant citation information):
Advanced Materials 19, 4172 (2007)
We have experimentally demonstrated that CdSe nanoparticles with sizes down to the quantum dot regime display electrical bistability. The degree of electrical bistability (on/off ratio) depended on the size of the particles. The two-dimensional array of such particles (via electrostatic assembly) showed conductance switching with an associated memory phenomenon at a suitable voltage. The switching was reversible for many cycles with two sets of I–V characteristics. With the scanning tunneling microscope tip as the other electrode, such bistability was observed in a monolayer of the nanoparticles. The results hence demonstrate that CdSe nanoparticles or quantum dots can be used as memory elements with a density of a bit per particle.