SEMICONDUCTOR DEVICE WITH SURROUNDING GATE TRANSISTORS IN A NAND CIRCUIT
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United States of America Patent
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Nov 4, 2015
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Sep 3, 2013
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Abstract
A semiconductor device employs surrounding gate transistors (SGTs) which are vertical transistors to constitute a CMOS NAND circuit. The NAND circuit is formed by using a plurality of MOS transistors arranged in m rows and n columns. The MOS transistors constituting the NAND circuit are formed on a planar silicon layer disposed on a substrate, and each have a structure in which a drain, a gate, and a source are arranged in a vertical direction, the gate surrounding a silicon pillar. The planar silicon layer includes a first active region having a first conductivity type and a second active region having a second conductivity type. The first active region and the second active region are connected to one another via a silicon layer formed on a surface of the planar silicon layer. This provides for a semiconductor device that constitutes a NAND circuit.
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