Patent ID: 6627501
Filing Date: 2003-09-30
Classification: H01L

Abstract:
A method of forming a tunnel oxide layer, comprising:providing a substrate; performing a rapid thermal oxidation step to form a silicon dioxide film on the substrate, wherein the rapid thermal oxidation step is performed by controlling a first parameter, and the first parameter comprises: a first reactive temperature between about 850 and about 1100; a first pressure between about 5 torr and about 15 torr; and a first reactive gas, and the first reactive gas comprises hydrogen, oxygen, and nitrogen, wherein a flow ratio of hydrogen of the first reactive gas to the combination of oxygen of the first reactive gas and hydrogen of the first reactive gas is between about 1% and about 33%; and performing a rapid annealing step on the silicon dioxide film on the substrate, wherein the rapid annealing step is performed by controlling a second parameter, and the second parameter comprises: a second reactive temperature between about 850 and about 1100; a second pressure between about 700 torr and about 760 torr; and a second reactive gas, wherein the second reactive gas comprises nitrogen and oxygen, and the flow rate of nitrogen of the second reactive gas is about 5 sccm and about 10 sccm, and the flow rate of oxygen of the second reactive gas is about 0.2 sccm and about 0.5 sccm.