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In this paper, we present a nanometer-sized floating-gate memory device, fabricated on silicon-on-insulator substrate and using silicon nanocrystals as storage nodes. Single electron charging and discharging phenomena occurring at room temperature will be demonstrated and discussed by means of simple analytical models. A deeper investigation of the impact of critical dimensions of the memory cell (i.e., active area and channel width and length) on the device operation (in particular, memory programming window), performed on a large number of samples, will be reported. Qualitative explanations for the observed experimental behaviors will be given.