Patent ID: 7064087
Filing Date: 2006-06-20
Classification: C23C,H01L

Abstract:
1. A method for depositing a doped silicon dioxide layer onto a wafer comprising: introducing a dopant precursor gas having a dopant precursor gas flow rate and a silicon-containing gas having a silicon-containing gas flow rate into a plasma within a deposition chamber, wherein a ratio of the dopant precursor gas flow rate to the silicon-containing gas flow rate has an initial value; increasing the ratio within the deposition chamber from the initial value to a final value during an initial deposition period; and maintaining the ratio within the deposition chamber at the final value during a final deposition period, wherein during the initial deposition period and the final deposition period the dopant precursor gas and the silicon-containing precursor gas react in the plasma to form the doped silicon dioxide layer on the wafer, and wherein the initial value of the ratio is determined by: measuring a concentration of dopant incorporated into a portion of a silicon dioxide layer as a function of the ratio for a first series of test depositions performed at a constant temperature; repeating the measurement of dopant concentration for a second series of test depositions performed at a different constant temperature; and measuring a temperature profile of the wafer during a third test deposition wherein the temperature is not held constant.