Patent ID: 6623996
Filing Date: 2003-09-23
Classification: H01L

Abstract:
A method of measuring contact alignment in a semiconductor device including an integrated circuit, comprising the steps of:forming a plurality of conductive members in at least two different layers of the semiconductor device, at least two of said conductive members having mutually differing electrical resistances; forming contact holes in said semiconductor device; forming an electrode pattern including at least two electrodes, said electrodes having respective contact plugs disposed in said contact holes, said contact plugs making electrical contact with different ones of said conductive members, depending on alignment of said contact holes; and measuring said contact alignment by measuring electrical resistance between said electrodes to determine with which of said conductive member said contact plugs make contact, thereby determining whether said contact holes are correctly aligned; wherein said conductive members include: a first conductive member, disposed in a first layer of the semiconductor device, making electrical contact with said contact plugs if said contact holes are correctly aligned; a second conductive member, disposed on one side of said contact plugs in a second layer of the semiconductor device, separated by a predetermined distance from said contact plugs if said contact holes are correctly aligned; and a third conductive member, disposed on another side of said contact plugs in said second layer of the semiconductor device, separated by said predetermined distance from said contact plugs if said contact holes are correctly aligned, differing in electrical resistance from said second conductive member.