Patent ID: 7919384
Filing Date: 2011-04-05
Classification: H01L

Abstract:
1. A method of making a capacitor bottom electrode of a semiconductor device, the method comprising: forming a sacrificial layer structure on a substrate, wherein the sacrificial layer structure includes a lower layer and an upper layer, and the lower layer is a silicon oxide layer, and the upper layer is a polysilicon layer; defining a plurality of first trenches in the sacrificial layer structure, wherein the first trenches are arranged in a first direction; filling the first trenches with an insulating material to form an insulating layer in each of the first trenches; defining a plurality of second trenches in the sacrificial layer structure, wherein the second trenches are arranged in a second direction, and the second direction intercrosses the first direction; filling the second trenches with a bottom electrode material to form a bottom electrode layer in each of the second trenches, wherein the insulating layers separate respectively the bottom electrode layers; and removing the sacrificial layer structure to define a plurality of receiving rooms between neighboring bottom electrode layers and neighboring insulating layers.