Patent ID: 7588950

Claim:
A method for fabricating a test pattern for reliability measurement of a copper interconnection line with a moisture window, comprising the steps of: forming a trench inside a first inter-layer insulation layer on the substrate; forming a second inter-layer insulation layer on a plurality of bottom copper interconnection lines and the first inter-layer insulation layer; forming a plurality of top copper interconnection lines buried in the second inter-layer insulation layer through a dual damascene process and connected to the plurality of bottom copper interconnection lines through a plurality of via contacts; and forming a plurality of passivation layers above the second inter-layer insulation layer and the plurality of top copper interconnection lines, each passivation layer having a width broader than a corresponding top copper interconnection line to cover the corresponding top copper interconnection line; and forming a plurality of moisture windows between the plurality of passivation layers to open a top portion of the second inter-layer insulation layer allowing moisture to flow in through the second inter-layer insulation layer to flow into the top copper interconnection lines during an electro migration (EM) test, wherein each of the plurality of moisture windows is a line shaped window opening a top portion of the second inter-layer insulation layer, wherein the step of forming the passivation layer comprises the steps of: forming the passivation layer covering the second inter-layer insulation layer and the plurality of top copper interconnection lines; opening one side of the plurality of top copper interconnection lines by applying a pad etching process to the passivation layer; forming a plurality of aluminum pads connected to the each corresponding top copper interconnection lines; and forming a moisture window mask on the passivation layer and the plurality of aluminum pads.