Patent ID: 6376303
Filing Date: 2002-04-23
Classification: H01L

Abstract:
A method of manufacturing a capacitor, comprising the steps of:forming a number of oxide layers one on top of the other over a substrate at a temperature of no more than 600Â° C. with a difference in impurities being provided between the oxide layers of each adjacent pair thereof, each one of the oxide layers of an adjacent pair exhibiting a different etching rate, when exposed to an etchant, from the other of the oxide layers of the adjacent pair due to the difference in the impurities contained in the oxide layers, and the oxide layers collectively constituting a multi-layered sacrificial structure; forming at least one hole in the sacrificial structure, whereby the sacrificial structure has a side wall portion delimiting the hole; etching the side wall of the sacrificial structure with said etchant to thereby etch the oxide layers at different rates and form a repeating series of tooth-like prominences and depressions at the side wall of the sacrificial structure; depositing conductive material over the series of tooth-like prominences and depressions such that the series of tooth-like prominences and depressions is reproduced in the conductive material and thereby forming a first conductive layer; removing the sacrificial structure after the first conductive layer is formed; and sequentially forming a dielectric film and a second conductive layer over the first conductive layer, wherein the forming of the oxide layers comprises forming alternating layers of a first BPSG having a first boron:phosphorus composition in a weight percent ratio of about 1:1 and a second BPSG having a boron:phosphorus composition in a weight percent ratio of about 1.2-2.0:1.