Patent ID: 8956937
Filing Date: 2015-02-17
Classification: H01L

Abstract:
1. A method of depositing the metal barrier layer comprising silicon dioxide, which is applied in a silicon substrate, a gate is disposed at the upper surface of the said silicon substrate, wherein the method comprises the following steps: ions, including a dose of fluorine, are implanted into the silicon substrate to form an active region of a PMOS transistor in the said silicon substrate, wherein fluorine ions are implanted in the silicon substrate in a dose of more than 1×10 a first silicon dioxide film is deposited to cover the exposed upper surface of the said silicon substrate and the said gate; a second silicon dioxide film is deposited to cover the upper surface of the first silicon dioxide film; a high temperature annealing process is continuously performed; wherein, the depositing rate of the said first silicon dioxide film is lower than that of the said second silicon dioxide film, wherein the first silicon dioxide film is denser than the second silicon dioxide film, wherein the first silicon dioxide film effectively prevents the implanted fluorine ions from being separated out during the annealing process.