Patent ID: 9093526
Filing Date: 2015-07-28
Classification: H01L

Abstract:
1. A method of forming a spacer, comprising: forming a liner layer; forming a layer of spacer material above said liner layer; performing a first main reactive ion etching process on said layer of spacer material to remove some of said layer of spacer material; stopping said first main reactive ion etching process prior to exposing said liner layer; and after stopping said first main reactive ion etching process, performing a second over-etch ion etching process on said layer of spacer material, wherein said first and second ion etching processes are performed using the following parameters: an inert gas flow rate within the range of about 50-200 sscm; a reactive gas flow rate within the range of about 3-20 sscm; a passivating gas flow rate within the range of about 3-20 sscm; a processing pressure within about 5-15 mT; a power level of about 200-500 W for ion generation; and a bias voltage of about 300-500 V.