Patent ID: 7619271
Filing Date: 2009-11-17
Classification: H01L

Abstract:
1. A deep trench device, comprising: a trench capacitor structure disposed in a bottom portion of a trench in a substrate, wherein the substrate has a drain region adjacent to the trench; a collar insulator formed on a sidewall of the trench and surrounding a portion of the trench capacitor structure, the collar insulator having a tapered height with regard to an outer peripheral sidewall of the trench, wherein a lowermost height of the collar insulator exposes a portion of the sidewall of the trench and an uppermost height of the collar insulator fully covers a portion of the sidewall of the trench; a connecting structure disposed in the trench and on top of the trench capacitor structure to electrically connect the trench capacitor structure to the drain region, wherein the connecting structure comprises: a cap layer disposed on the connecting structure.