Patent ID: 7868377
Filing Date: 2011-01-11
Classification: H01L

Abstract:
1. A flash memory, comprising: a substrate; a memory cell string comprising a plurality of storage transistors positioned on the substrate, wherein each of the storage transistors comprises a first gate length, respectively; a first select gate transistor comprising a second gate length, wherein the first select gate transistor is connected to the memory cell string in series; and a second select gate transistor comprising a third gate length, wherein the second select gate transistor is connected to the first select gate transistor in series, the first select gate transistor and the second select gate transistor are positioned on a side of the memory cell string, the first select gate transistor comprises a recessed channel, wherein the first select gate transistor directly adjacent to the memory cell string on one side of the first select gate transistor and the second select gate transistor on a opposite side of the first select gate transistor.