Patent ID: 7799632
Filing Date: 2010-09-21
Classification: H01L

Abstract:
1. A method of forming an isolation structure, comprising: forming an isolation trench within a semiconductor body; and filling the isolation trench by performing a multiple step high density plasma (HDP) process to deposit multiple layers, wherein the multiple step HDP process comprises: performing a first HDP deposition at a first high frequency power of between 100 watts and 900 watts to form a first layer of said multiple layers; performing a second HDP deposition, wherein the second HDP deposition uses a second high frequency power greater than said first high frequency power to form a second layer of said multiple layers; performing a first etch step after performing said first HDP deposition and said second HDP deposition, wherein the first etch step is the first occurring etch step of the multiple step HDP process; and performing a third HDP deposition after performing the first etch step to form a third layer of said multiple layers.