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A silicon nanocrystals based memory
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DOI：10.1063/1.116085.png)
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A new memory structure using threshold shifting from charge stored in nanocrystals of silicon (approximate to 5 nm in size) is described. The devices utilize direct tunneling and storage of electrons in the nanocrystals. The limited size and capacitance of the nanocrystals limit the numbers of stored electrons. Coulomb blockade effects may be important in these structures but are not necessary for their operation. The threshold shifts of 0.2-0.4 V with read and write times less than 100's of a nanosecond at operating voltages below 2.5 V have been obtained experimentally. The retention times are measured in days and weeks, and the structures have been operated in an excess of 10(9) cycles without degradation in performance. This nanomemory exhibits characteristics necessary for high density and low power. (C) 1996 American Institute of Physics.
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