Patent ID: 7700484
Filing Date: 2010-04-20
Classification: C23C,H01L

Abstract:
1. A method of filling nano-sized features of a substrate using a deposition system including a processing chamber, a gas supply system coupled to the processing chamber, an inductively coupled plasma (ICP) source coupled to the processing chamber, a copper target coupled to the processing chamber, a DC source coupled to the copper target, a substrate holder coupled to the processing chamber, an RF bias generator coupled to the substrate holder for supporting the substrate, and a backside gas supply system coupled to the substrate holder, the method comprising performing consecutive first and second dry-filling processes by: performing the first dry-filling process with a first backside pressure applied to the substrate to maintain the substrate at below room temperature, the performing of the first dry-filling process comprising: performing the second dry-filling process with a second backside pressure applied to the substrate, the second backside pressure being sufficiently lower than the first backside pressure so as to increase the surface mobility of the deposited low-resistivity copper on the sidewalls during the second dry-filling process and create a bottom-up filling process, the performing of the second dry-filling process comprising: