Patent ID: 8183128
Filing Date: 2012-05-22
Classification: H01L

Abstract:
1. A method for reducing roughness of an exposed rough surface of an insulator layer on a first substrate, which comprises: depositing the insulator layer on the first substrate wherein the insulator layer is an oxide deposited on the first substrate using low pressure chemical vapor deposition and has the exposed rough surface opposite the first substrate; and smoothing the as deposited exposed rough surface of the insulator layer after the depositing by exposure to a gas plasma in a chamber so as to reduce the mean surface roughness by 6-56% from an initial roughness of 4-5.37 Å rms (root mean square), wherein the chamber contains therein a gas at a pressure of greater than 0.25 Pa but less than 30 Pa, with the gas plasma created using a radiofrequency generator applying to the insulator layer a power density greater than 0.6 W/cm