Structure and method for low Vss resistance and reduced dibl in a floating gate memory cell

According to one exemplary embodiment, a floating gate memory cell comprises a stacked gate structure situated on a substrate and situated over a channel region in the substrate. The floating gate memory cell further comprises a recess formed in the substrate adjacent to the stacked gate structure,...

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Bibliographische Detailangaben
1. Verfasser: FANG SHENQING,OGAWA HIROYUKI,THURGATE TIMOTHY,CHANG KUO TUNG,FASTOW RICHARD,HUI ANGELA T.,MIZUTANI KAZUHIRO,KO KELWIN,KINOSHITA HIROYUKI,SUN YU
Format: Patent
Sprache:eng
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Zusammenfassung:According to one exemplary embodiment, a floating gate memory cell comprises a stacked gate structure situated on a substrate and situated over a channel region in the substrate. The floating gate memory cell further comprises a recess formed in the substrate adjacent to the stacked gate structure, where the recess has a sidewall, a bottom, and a depth. According to this exemplary embodiment, the floating gate memory cell further comprises a source situated adjacent to the sidewall of the recess and under the stacked gate structure. The floating gate memory cell further comprises a Vss connection region situated under the bottom of the recess and under the source, where the Vss connection region is connected to the source. The Vss connection region being situated under the bottom of the recess causes the source to have a reduced lateral diffusion in the channel region.