Dual damascene process and method for forming a copper interconnection layer using same

摘要

A method for forming a copper interconnection using a dual damascene process includes forming a second insulating layer on a first insulating layer, the first insulating layer including a lower metal interconnection layer formed therein; forming a photoresist film pattern on the second insulating layer; forming a dry film resist film pattern on the photoresist film pattern; forming a via hole and a trench in the second insulator layer to expose a portion of the lower metal interconnection layer by etching the second insulating layer using the dry film resist film pattern and the photoresist film pattern as an etching mask; removing the DFR film pattern and the photoresist film pattern; forming a copper layer to fill the via hole and the trench; and planarizing the copper layer to form a copper interconnection layer. Planarizing the copper layer is performed using a chemical mechanical polishing method.