Patent ID: 8735283
Filing Date: 2014-05-27
Classification: H01L

Abstract:
1. A method, comprising: forming an organic polymer layer over a semiconductor substrate; forming a silicon containing antireflective coating on said organic polymer layer; forming a patterned photoresist layer on said antireflective coating, said patterned photoresist layer having an opening therein; performing a first reactive ion etch to transfer the pattern of said opening into said antireflective coating to form a trench in said antireflective coating, said organic polymer layer exposed in a bottom of said trench; and performing a second reactive ion etch to extend said trench into said organic polymer layer, said second reactive ion etch removing said patterned photoresist layer, said second reactive ion etch forming a polymer layer on sidewalls of said trench, said second reactive ion etch containing a species derived from a gaseous hydrocarbon.