Abstract
In this letter, new limitations on the NOR flash cell scaling have been presented. As cell scaling is continued, a parasitic capacitance between floating gate and bitline contact induces a large disturbance to the Fowler-Nordheim tunneling characteristics due to a coupling ratio variation, resulting in a much broader erase threshold distribution. Theoretical analysis including MEDICI simulations confirms the effects of parasitic capacitance on the erase threshold of NOR flash cells.
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