Patent ID: 6541347
Filing Date: 2003-04-01
Classification: G03F,H01L

Abstract:
A manufacturing method of a lower electrode of a trench capacitor, comprising:providing a substrate having a plurality of trenches therein; forming a conformal silicon oxide layer over the substrate, wherein the silicon oxide layer is doped with a conducting dopant; modifying a surface of the silicon oxide layer to enhance the adhesion between the silicon oxide layer and a photoresist with an oxygen plasma treatment or a wet treatment; coating the photoresist over the substrate, wherein the photoresist flows into the trenches of the substrate and has planarity; baking the photoresist to harden the photoresist without loss of planarity; removing a part of the photoresist until a distance exists between the upper surface of the photoresist and the upper surface of the substrate; removing the exposed silicon oxide layer; removing the photoresist; and driving the conducting dopant into the substrate to form a lower electrode.