Patent ID: 6706607
Filing Date: 2004-03-16
Classification: H01L

Abstract:
A method for fabricating a capacitor in a semiconductor device comprising the steps of:forming a lower electrode on a substrate; forming a nitride-based first dielectric layer on the lower electrode; forming a second dielectric layer by depositing an Al2O3 layer on the nitride-based first dielectric layer through an atomic layer deposition (ALD) process, wherein the ALD process includes the steps of: flowing (CH3)3Al gas as a source gas and NH3 gas for about 0.1 seconds to 10 seconds on the substrate; flowing N2 gas for about 0.1 seconds to 10 seconds to purge the unreacted (CH3)3 Al gas; flowing H2O gas that is a source for supplying oxygen to the substrate for 0.1 seconds to 10 seconds; and flowing the N2 gas for about 0.1 seconds to 10 seconds to purge the unreacted H2O gas. forming a third dielectric layer on the second dielectric layer; and forming an upper electrode on the third dielectric layer.