Patent ID: 8928057
Filing Date: 2015-01-06
Classification: H01L

Abstract:
1. A method comprising: providing a plurality of fins etched from a semiconductor substrate and covered by an oxide layer and a nitride layer, the oxide layer being located between the plurality of fins and the nitride layer; removing a portion of the plurality of fins to form an opening; forming a dielectric spacer on a sidewall of the opening; filling the opening with a fill material, wherein a top surface of the fill material is substantially flush with a top surface of the nitride layer; forming a deep trench capacitor in-line with one of the plurality of fins; removing the nitride layer to form a gap between the plurality of fins and the fill material, wherein the fill material has re-entrant geometry extending over the gap; and removing the re-entrant geometry and causing the gap between the plurality of fins and the fill material to widen.