DRAM DEVICE INCLUDING AN AIR GAP AND A SEALING LAYER

A DRAM device includes an isolation region defining source and drain regions in a substrate, a first bit line structure connected to the source region, a second bit line structure disposed on the isolation region, an inner spacer vertically extending on a first sidewall of the first bit line structu...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	AN, Hokyun, LEE, Dain, YOO, Wonseok, KANG, Yoongoo, PARK, Kyungwook
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY INFORMATION STORAGE PHYSICS SEMICONDUCTOR DEVICES STATIC STORES
Online-Zugang:	Volltext bestellen
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Beschreibung
Zusammenfassung:	A DRAM device includes an isolation region defining source and drain regions in a substrate, a first bit line structure connected to the source region, a second bit line structure disposed on the isolation region, an inner spacer vertically extending on a first sidewall of the first bit line structure, an air gap is between the inner spacer and an outer spacer, a storage contact between the first and second bit line structures and connected to the drain region, a landing pad structure vertically on the storage contact, and a storage structure vertically on the landing pad structure. The sealing layer seals a top of the first air gap. The sealing layer includes a first sealing layer on a first sidewall of a pad isolation trench, and a second sealing layer on a second sidewall of the pad isolation trench and separated from the first sealing layer.